Publish quixos-protocol from 473886a58fdacf15f2c873b77da96faf3be7fa65

Continue final hosted development reliability qualification.

.quixos-subtree-source.json

@@ -1,8 +1,8 @@
 {
   "version": 1,
-  "sourceRepo": "https://gitea-external.egads.tutti.syntaxblitz.net/quixos/quixos",
-  "sourceCommit": "abc91ab1cbbd61ffd7f0a49dbc5768598ac8745c",
+  "sourceRepo": "https://gitea.internal.quixos.org/quixos/quixos.git",
+  "sourceCommit": "473886a58fdacf15f2c873b77da96faf3be7fa65",
   "sourcePath": "quixos-protocol",
   "exportName": "quixos-protocol",
-  "mirrorRemote": "https://gitea-external.egads.tutti.syntaxblitz.net/quixos/quixos-protocol.git"
+  "mirrorRemote": "https://repos.quixos.org/quixos-toolchain/quixos-protocol.git"
 }

nix/checked-candidate.nix

@@ -6,6 +6,8 @@
   kind,
   generator,
   contractOnly ? false,
+  workspaceId ? null,
+  platformSourceJSON ? null,
   system ? builtins.currentSystem,
 }:
 let
@@ -70,9 +72,21 @@ let
     else
       { };
   execution = (configuration.backend or "typescript") == "execution";
-  runtime = builtins.getFlake (
-    "git+${root.lock.quixos.repository}?rev=${root.lock.quixos.commit}&ref=refs/tags/quixos-reachability/${root.lock.quixos.commit}"
-  );
+  platformSource = if platformSourceJSON == null then null else builtins.fromJSON platformSourceJSON;
+  runtime =
+    if platformSource == null then
+      builtins.getFlake (
+        "git+${root.lock.quixos.repository}?rev=${root.lock.quixos.commit}&ref=refs/tags/quixos-reachability/${root.lock.quixos.commit}"
+      )
+    else
+      assert platformSource.repository == root.lock.quixos.repository;
+      assert platformSource.commit == root.lock.quixos.commit;
+      # getFlake accepts a context-free flake reference. storePath first checks
+      # presence; the resulting flake retains its immutable source as an input.
+      # Dropping string context here does not permit an authored mutable path.
+      builtins.getFlake (
+        builtins.unsafeDiscardStringContext "path:${builtins.storePath platformSource.directory}"
+      );
   runtimePackages = runtime.packages.${system};
   resourceClosure =
     includeBuild: node:
@@ -164,6 +178,11 @@ let
               ${queryGeneratorFlags root} \
               --checked-resources ${checkedResources node} \
               --source-root-commit ${pkgs.lib.escapeShellArg node.commit} \
+              ${
+                pkgs.lib.optionalString (
+                  workspaceId != null
+                ) "--workspace-id ${pkgs.lib.escapeShellArg workspaceId}"
+              } \
               --checkout-root "$TMPDIR/checkouts" --snapshot-map ${snapshots node} \
               --graph-out "$out/graph.json" --schemas-out "$out/package-schemas.json" \
               ${
@@ -357,6 +376,13 @@ let
     )
   );
 in
+assert
+  workspaceId == null
+  || (
+    kind == "workspace"
+    && builtins.isString workspaceId
+    && builtins.match "[a-zA-Z0-9][a-zA-Z0-9:._-]{0,255}" workspaceId != null
+  );
 pkgs.runCommand (if contractOnly then "qx-contract" else "qx-checked-candidate") { } ''
   mkdir -p "$out"
   cp ${
@@ -381,12 +407,19 @@ pkgs.runCommand (if contractOnly then "qx-contract" else "qx-checked-candidate")
       ${pkgs.nodejs_24}/bin/node ${./check-execution.mjs} \
         ${protocol}/libexec/quixos-protocol/execution-world.mjs \
         "$out/execution-plan.json" "$out/checks.json" "$out"
-      mkdir -p "$out/bin"
-      cat > "$out/bin/run-isolated" <<EOF
-      #!${pkgs.runtimeShell}
-      exec ${runtimePackages.camino-isolated-workspace}/bin/camino-isolated-workspace "$out" "\$@"
-      EOF
-      chmod +x "$out/bin/run-isolated"
+      # The optional development host is acquired only when explicitly run.
+      # Embedding its executable here made every source check build Web Studio
+      # and a full host even when only checked Package outputs were consumed.
+      cp ${
+        pkgs.writeText "qx-isolated-runtime.json" (
+          builtins.toJSON {
+            codec = "quixos-isolated-runtime/1";
+            source = {
+              inherit (root.lock.quixos) repository commit;
+            };
+          }
+        )
+      } "$out/isolated-runtime.json"
     ''}
   ''}
   ${pkgs.lib.optionalString (

src/bindings/presentation-queries.ts

@@ -41,15 +41,19 @@ export function presentationQueries(pkg: PackageRevision, interfaces: readonly I
       ];
     });
     const stem = `PresentationNavigation${createHash("sha256").update(id).digest("hex").slice(0, 12)}`;
-    const inputs = `presentation:navigation:${id}:inputs`;
-    for (const local of [false, true]) {
-      const name = `${stem}${local ? "View" : "Inputs"}`;
-      const document = `generated/${name}.graphql`;
-      documents.set(
-        document,
-        `query ${name}($presentationMount: QxRef_PresentationMount!) {
+    // Retain full state for operations and hidden occurrences, independently
+    // from the identity projection used to prepare a rendering occurrence.
+    for (const identity of [false, true]) {
+      const prefix = `presentation:navigation:${id}:${identity ? "identity-" : ""}`;
+      const inputs = prefix + "inputs";
+      for (const local of [false, true]) {
+        const name = `${stem}${identity ? "Identity" : ""}${local ? "View" : "Inputs"}`;
+        const document = `generated/${name}.graphql`;
+        documents.set(
+          document,
+          `query ${name}($presentationMount: QxRef_PresentationMount!) {
         root { ${local ? "availableObjects" : "objects"}(all:512, where:{_camino:{as:{PresentationState:{presentationMount:{eq:$presentationMount}}}}}) {
-          entries { node { ${fields.join("\n")}
+          entries { node { ${identity ? "" : fields.join("\n")}
             ... on PresentationState {
               _presentationOccurrence: occurrence
               _presentationSource: source {_camino {ref}}
@@ -59,20 +63,21 @@ export function presentationQueries(pkg: PackageRevision, interfaces: readonly I
           } }
         } }
       }`,
-      );
-      generated.push({
-        id: local ? `presentation:navigation:${id}:view` : inputs,
-        displayName: name,
-        root: { kind: "workspace-interface", interface: contract.revisionId },
-        document,
-        operation: name,
-        fragments: [],
-        views: [],
-        allowances: [],
-        budgets: { ...defaultQueryBudgets, rows: 5000, candidates: 5000, resultBytes: 8388608 },
-        watch: local,
-        placement: local ? { kind: "local", sourceQueryId: inputs } : { kind: "replica" },
-      });
+        );
+        generated.push({
+          id: local ? prefix + "view" : inputs,
+          displayName: name,
+          root: { kind: "workspace-interface", interface: contract.revisionId },
+          document,
+          operation: name,
+          fragments: [],
+          views: [],
+          allowances: [],
+          budgets: { ...defaultQueryBudgets, rows: 5000, candidates: 5000, resultBytes: 8388608 },
+          watch: local,
+          placement: local ? { kind: "local", sourceQueryId: inputs } : { kind: "replica" },
+        });
+      }
     }
   }
   for (const query of generated)

src/capability-language/assembly.ts

@@ -3,6 +3,7 @@ import path from "node:path";
 import { profile } from "./profile.js";
 import { loadQxSources, resolveQxSources } from "./source-loader.js";
 import { compileQuery, compileRepositoryQuery } from "../query/compile.js";
+import { queryTreeProjections } from "../query/tree.js";
 import type { QueryDeclaration } from "../query/types.js";
 import { compileQueryComposition, type QueryComposition } from "../query/composition.js";
 import { checkQueryTemplate } from "../query/templates.js";
@@ -390,6 +391,13 @@ const createResourceGraphResolver = (
             };
             pkg.checkedQueries = [];
             for (const query of pkg.queries!) pkg.checkedQueries.push(await compile(query.id));
+            const projections = pkg.checkedQueries.flatMap(queryTreeProjections);
+            for (const projection of projections) {
+              if (pkg.queries!.some((query) => query.id === projection.declaration.id))
+                throw new Error(`Generated Query Tree projection conflicts with ${projection.declaration.id}`);
+              pkg.queries!.push(projection.declaration);
+              pkg.checkedQueries.push(projection);
+            }
           }
           if (generated?.compositions?.length) {
             const pkg = compiled.resource.revision;

src/capability-language/authoring-check.ts

@@ -97,6 +97,7 @@ export async function checkAuthoring(
         (phase, ms) => {
           timings[phase] = ms;
         },
+        resource.kind === "workspace" ? context.workspaceId : undefined,
       );
     } finally {
       timings.immutableCheckMs = Math.round(performance.now() - buildStarted);

src/capability-language/authoring-context.ts

@@ -20,38 +20,87 @@ export async function authoringContext(start: string) {
       if ((error as NodeJS.ErrnoException).code !== "ENOENT") throw error;
     }
     if (text !== undefined) {
-      const graph = JSON.parse(text) as { resources: AuthoringResource[] };
+      const graph = JSON.parse(text) as { resources: AuthoringResource[]; workspaceId?: string };
+      if (!graph || typeof graph !== "object" || Array.isArray(graph))
+        throw new Error("Managed resource inventory is malformed");
+      if (
+        graph.workspaceId !== undefined &&
+        (typeof graph.workspaceId !== "string" || !/^[a-zA-Z0-9][a-zA-Z0-9:._-]{0,255}$/.test(graph.workspaceId))
+      )
+        throw new Error("Managed workbench has an invalid Workspace identity");
       if (!Array.isArray(graph.resources)) throw new Error("Managed resource inventory is malformed");
       const resources: AuthoringResource[] = [{ kind: "workspace", directory: "root" }];
       const identities = new Set<string>(),
         directories = new Set<string>(["root"]);
-      for (const entry of graph.resources) {
-        // Compiler graphs carry resolved paths; the authoring API presents
-        // stable workbench-relative names and validates containment here.
-        if (typeof entry.directory === "string" && path.isAbsolute(entry.directory))
-          entry.directory = path.relative(workbench, entry.directory);
+      for (const [index, entry] of graph.resources.entries()) {
+        const invalid = (reason: string): never => {
+          throw new Error(`Invalid managed resource registration at entry ${index + 1}: ${reason}`);
+        };
         if (
-          !["interface", "package", "build"].includes(entry.kind) ||
-          !entry.source ||
-          !/^resources\/[A-Za-z0-9][A-Za-z0-9._-]*$/.test(entry.directory)
-        ) {
-          throw new Error("Invalid managed resource registration");
+          !entry ||
+          typeof entry !== "object" ||
+          Array.isArray(entry) ||
+          !["interface", "package", "build"].includes(entry.kind)
+        )
+          invalid("unsupported resource kind");
+        if (
+          entry.resourceId !== undefined &&
+          (typeof entry.resourceId !== "string" ||
+            entry.resourceId.length < 1 ||
+            entry.resourceId.length > 256 ||
+            entry.resourceId.includes("\0"))
+        )
+          invalid("resource identity must be a bounded nonempty identifier");
+        const source = entry.source;
+        if (
+          !source ||
+          typeof source !== "object" ||
+          Array.isArray(source) ||
+          source.resolver !== "git" ||
+          typeof source.repository !== "string" ||
+          !source.repository ||
+          source.repository.length > 4096 ||
+          source.repository.includes("\0") ||
+          typeof source.commit !== "string" ||
+          !/^([0-9a-f]{40}|[0-9a-f]{64})$/.test(source.commit)
+        )
+          invalid("expected an immutable Git source");
+        // Git transport policy belongs to the source resolver, including its
+        // maintained local/file fixtures; registration validates only its shape.
+        if (
+          typeof entry.directory !== "string" ||
+          !entry.directory ||
+          entry.directory.length > 4096 ||
+          entry.directory.includes("\0")
+        )
+          invalid("directory must be a bounded path");
+        // Bootstrap intentionally records stable aliases for native histories.
+        // Compare physical paths on BOTH sides, then expose the same canonical
+        // workbench-relative selection for alias and physical working dirs.
+        let directory: string;
+        try {
+          directory = path.relative(workbench, await realpath(path.resolve(workbench, entry.directory)));
+        } catch {
+          invalid("registered directory is unavailable");
         }
-        const identity = `${entry.kind}\0${entry.resourceId ?? entry.source.repository}`;
-        if (identities.has(identity) || directories.has(entry.directory)) {
-          throw new Error(`Multiple editable selections for ${entry.resourceId ?? entry.source.repository}`);
+        if (!/^resources\/[A-Za-z0-9][A-Za-z0-9._-]*$/.test(directory!))
+          invalid("registered directory must resolve beneath workbench resources");
+        const identity = `${entry.kind}\0${entry.resourceId ?? source!.repository}`;
+        if (identities.has(identity) || directories.has(directory!)) {
+          throw new Error(`Multiple editable selections for ${directory!}`);
         }
         identities.add(identity);
-        directories.add(entry.directory);
+        directories.add(directory!);
         resources.push({
           kind: entry.kind,
-          directory: entry.directory,
+          directory: directory!,
           resourceId: entry.resourceId,
           source: entry.source,
         });
       }
       return {
         workbench,
+        workspaceId: graph.workspaceId,
         resources,
         async baseline() {
           const result = await loadQuixosLock(path.join(workbench, "root/quixos.lock"));

src/capability-language/authoring-converge.ts

@@ -4,6 +4,7 @@ import { execFile as callback } from "node:child_process";
 import { promisify } from "node:util";
 import { randomUUID } from "node:crypto";
 import { authoringContext } from "./authoring-context.js";
+import { managedResourcePath } from "./managed-source-path.js";
 import { snapshotCommit } from "./checked-build.js";
 import { profile } from "./profile.js";
 import {
@@ -85,6 +86,11 @@ export async function convergeAuthoring(start: string, target = "root") {
   const context = await authoringContext(start);
   const graphFile = path.join(context.workbench, ".quixos/resource-graph.json");
   const graphBefore = await readFile(graphFile, "utf8");
+  const graph = JSON.parse(graphBefore);
+  // Discovery resolves outer guest aliases. Persist those same physical
+  // selections, without accepting symlinks within the managed workbench.
+  for (const resource of graph.resources)
+    resource.directory = await managedResourcePath(context.workbench, resource.directory);
   const blockers: AuthoringBlocker[] = [];
   const nodes = new Map<string, { directory: string; kind: string; source: GitSource; dependencies: string[] }>();
   const selected = new Map<string, string>();
@@ -247,9 +253,6 @@ export async function convergeAuthoring(start: string, target = "root") {
   profile("capture-recheck", recheckStarted, { repositories: complete.size });
   // Persist successful selections even if another repository is still broken.
   // Recovery must not depend on all parents succeeding in the same invocation.
-  const graph = JSON.parse(graphBefore);
-  for (const resource of graph.resources)
-    resource.directory = path.relative(context.workbench, path.resolve(context.workbench, resource.directory));
   const replacements = new Map<string, string>();
   for (const resource of graph.resources) {
     const source = complete.get(resource.directory);

src/capability-language/checked-build.ts

@@ -112,12 +112,23 @@ export async function buildImmutableCandidate(
   logFile: string,
   contractOnly = false,
   observe?: (phase: "nixEvaluationMs" | "nixBuildMs", ms: number) => void,
+  workspaceId?: string,
+  platformSource?: { repository: string; commit: string; directory: string },
 ): Promise<string> {
+  if (workspaceId !== undefined && (kind !== "workspace" || !/^[a-zA-Z0-9][a-zA-Z0-9:._-]{0,255}$/.test(workspaceId)))
+    throw new Error("Instance binding requires a valid Workspace identity and a Workspace root");
   if (!/^(?:[a-f0-9]{40}|[a-f0-9]{64})$/.test(source.commit))
     throw new Error("An immutable candidate requires an exact commit");
   const url = new URL(source.repository);
   if (url.protocol !== "https:" || url.username || url.password || url.search || url.hash)
     throw new Error("Candidate origin must be credential-free HTTPS");
+  if (
+    platformSource &&
+    (Object.keys(platformSource).sort().join(",") !== "commit,directory,repository" ||
+      !/^[a-f0-9]{40}$/.test(platformSource.commit) ||
+      !/^\/nix\/store\/[a-z0-9]{32}-[^/\s]+$/.test(platformSource.directory))
+  )
+    throw Error("Invalid immutable platform source input");
   const generator =
     process.env.QUIXOS_CHECK_GENERATOR ?? path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
   if (!/^\/nix\/store\/[^/]+$/.test(generator)) throw new Error("Use the installed Quixos checker");
@@ -200,6 +211,8 @@ export async function buildImmutableCandidate(
         "--arg",
         "contractOnly",
         contractOnly ? "true" : "false",
+        ...(workspaceId === undefined ? [] : ["--argstr", "workspaceId", workspaceId]),
+        ...(platformSource ? ["--argstr", "platformSourceJSON", JSON.stringify(platformSource)] : []),
         "--add-root",
         gcRoot,
         "--indirect",

src/capability-language/development-sources.ts

@@ -0,0 +1,97 @@
+import { execFile as callback } from "node:child_process";
+import { promisify } from "node:util";
+import { randomUUID } from "node:crypto";
+import { mkdir, mkdtemp, lstat, rename, rm, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { materializeWorkspaceSources, workspaceSourcePin, type WorkspaceSourcePin } from "./source-closure.js";
+
+const exec = promisify(callback);
+
+/** Developer workflow, not an ordinary Workspace Agent's implicit permission
+ * to publish against canonical repositories. Creates independent Git/jj copies,
+ * with instance binding outside committed source. No Graph is started here.
+ */
+export async function prepareDevelopmentSources(options: {
+  source: WorkspaceSourcePin;
+  directory: string;
+  cacheDirectory: string;
+  locations?: Record<string, string>;
+  workspaceId?: string;
+}) {
+  const source = workspaceSourcePin(options.source);
+  if (options.workspaceId !== undefined && !/^[0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12}$/.test(options.workspaceId))
+    throw Error("Development source binding requires a Workspace UUID");
+  const destination = path.resolve(options.directory);
+  const cache = path.resolve(options.cacheDirectory);
+  if (cache === destination || cache.startsWith(destination + path.sep))
+    throw Error("The retained source cache must live outside the disposable workbench");
+  if (
+    await lstat(destination).catch((error: NodeJS.ErrnoException) => {
+      if (error.code !== "ENOENT") throw error;
+      return null;
+    })
+  )
+    throw Error("Choose a new development workbench directory; existing checkouts are never overwritten");
+  const closure = await materializeWorkspaceSources({
+    source,
+    directory: options.cacheDirectory,
+    locations: options.locations,
+  });
+  const origins = new Set<string>();
+  for (const entry of closure.resources) {
+    const identity = `${entry.kind}:${entry.repository}`;
+    if (origins.has(identity)) throw Error("Multiple revisions of one repository require explicit editable selection");
+    origins.add(identity);
+  }
+  const parent = path.dirname(destination);
+  await mkdir(parent, { recursive: true });
+  const staging = await mkdtemp(path.join(parent, ".development-sources-"));
+  // This local association does not create or grant access to a hosted Graph.
+  const workspaceId = options.workspaceId ?? randomUUID();
+  try {
+    const resources = [];
+    for (const entry of closure.resources) {
+      const relative = entry.kind === "workspace" ? "root" : "resources/" + entry.directory;
+      const checkout = path.join(staging, relative);
+      await mkdir(path.dirname(checkout), { recursive: true });
+      await exec("git", [
+        "clone",
+        "--no-hardlinks",
+        "--",
+        path.join(path.resolve(options.cacheDirectory), entry.directory),
+        checkout,
+      ]);
+      await exec("git", ["remote", "set-url", "origin", entry.repository], { cwd: checkout });
+      await exec("git", ["checkout", "--detach", entry.commit], { cwd: checkout });
+      await exec("jj", ["git", "init", "--colocate"], {
+        cwd: checkout,
+        env: { ...process.env, QUIXOS_JJ_NO_CHECKPOINT: "1", QUIXOS_SUBTREE_PUBLISH: "0" },
+      });
+      await exec("jj", ["describe", "-m", "Develop canonical application source"], {
+        cwd: checkout,
+        env: { ...process.env, QUIXOS_JJ_NO_CHECKPOINT: "1", QUIXOS_SUBTREE_PUBLISH: "0" },
+      });
+      if (entry.kind !== "workspace")
+        resources.push({
+          kind: entry.kind,
+          directory: relative,
+          source: { resolver: "git", repository: entry.repository, commit: entry.commit },
+        });
+    }
+    await mkdir(path.join(staging, ".quixos"), { mode: 0o700 });
+    await writeFile(
+      path.join(staging, ".quixos/resource-graph.json"),
+      JSON.stringify({ formatVersion: 1, workspaceId, resources }, null, 2) + "\n",
+      { mode: 0o600 },
+    );
+    await writeFile(
+      path.join(staging, ".quixos/development-source.json"),
+      JSON.stringify({ source, workspaceId }, null, 2) + "\n",
+      { mode: 0o600 },
+    );
+    await rename(staging, destination);
+    return { directory: destination, source, workspaceId, repositories: closure.resources.length };
+  } finally {
+    await rm(staging, { recursive: true, force: true });
+  }
+}

src/capability-language/file-lock.ts

@@ -1,14 +1,19 @@
 import { spawn } from "node:child_process";
 
+export class FileLockBusyError extends Error {}
+
 /** Kernel-owned lock: a crashed coordinator cannot leave a stale ownership file.
  * The persistent file is just an inode; EOF releases the helper's lock. */
-export async function withFileLock<T>(filename: string, work: () => Promise<T>): Promise<T> {
+export async function withFileLock<T>(
+  filename: string,
+  work: () => Promise<T>,
+  { nonblocking = false }: { nonblocking?: boolean } = {},
+): Promise<T> {
   const child = spawn(
     "flock",
     [
       "--exclusive",
-      "--timeout",
-      "120",
+      ...(nonblocking ? ["--nonblock"] : ["--timeout", "120"]),
       "--conflict-exit-code",
       "75",
       filename,
@@ -32,15 +37,17 @@ export async function withFileLock<T>(filename: string, work: () => Promise<T>):
     await new Promise<void>((resolve, reject) => {
       let output = "";
       child.once("error", reject);
-      child.once("exit", (code) =>
+      child.once("exit", (code) => {
         reject(
-          new Error(
-            code === 75
-              ? "Timed out after 120 seconds waiting for another authoring command; inspect that command before retrying"
-              : `Cannot acquire authoring lock: ${diagnostics}`,
-          ),
-        ),
-      );
+          code === 75
+            ? new FileLockBusyError(
+                nonblocking
+                  ? "Another process owns this lock"
+                  : "Timed out after 120 seconds waiting for another authoring command; inspect that command before retrying",
+              )
+            : new Error(`Cannot acquire authoring lock: ${diagnostics}`),
+        );
+      });
       child.stdout.on("data", (chunk) => {
         output += chunk;
         if (output.includes("locked\n")) resolve();

src/capability-language/managed-source-path.ts

@@ -0,0 +1,19 @@
+import { realpath } from "node:fs/promises";
+import path from "node:path";
+
+/** Registration may name the workbench through its guest alias. Only that
+ * outer alias is permitted: resources and each checkout remain physical,
+ * directly contained directories. Persist the resulting root-relative path.
+ */
+export async function managedResourcePath(workbench: string, directory: string): Promise<string> {
+  const root = await realpath(workbench);
+  const selected = path.resolve(root, directory);
+  const name = path.basename(selected);
+  const resources = path.dirname(selected);
+  if (path.basename(resources) !== "resources" || !/^[A-Za-z0-9][A-Za-z0-9._-]*$/.test(name))
+    throw new Error(`Repository is outside the managed workbench: ${directory}`);
+  const relative = `resources/${name}`;
+  if ((await realpath(path.dirname(resources))) !== root || (await realpath(selected)) !== path.join(root, relative))
+    throw new Error(`Managed repository path crosses a symlink or escapes the workbench: ${directory}`);
+  return relative;
+}

src/capability-language/pin-upgrades.ts

@@ -15,8 +15,14 @@ import {
 } from "./assembly.js";
 import { createGitCapabilityResolver } from "./git-resolver.js";
 import { snapshotCommit, buildImmutableCandidate } from "./checked-build.js";
-import { planEvolution, type WorkspaceRevision, type EvolutionReview } from "../capability-model/index.js";
+import {
+  planEvolution,
+  reviewSemanticMajors,
+  type WorkspaceRevision,
+  type EvolutionReview,
+} from "../capability-model/index.js";
 import { withFileLock } from "./file-lock.js";
+import { managedResourcePath } from "./managed-source-path.js";
 const execFile = promisify(callback);
 type Source = { repository: string; commit: string };
 export type UpgradeNode = { kind: "workspace" | "package" | "interface" | "build"; directory: string; source: Source };
@@ -93,7 +99,8 @@ const writeJournal = async (filename: string, journal: unknown) => {
   }
 };
 
-export const discoverUpgradeSpec = async (workbench: string): Promise<UpgradeSpec> => {
+export const discoverUpgradeSpec = async (workbenchPath: string): Promise<UpgradeSpec> => {
+  const workbench = await fs.realpath(workbenchPath);
   const graph = JSON.parse(await fs.readFile(path.join(workbench, ".quixos/resource-graph.json"), "utf8"));
   const root = await location(workbench, "root");
   const nodes: UpgradeNode[] = [
@@ -105,11 +112,15 @@ export const discoverUpgradeSpec = async (workbench: string): Promise<UpgradeSpe
         commit: await command(root, "jj", ["--ignore-working-copy", "log", "--no-graph", "-r", "@", "-T", "commit_id"]),
       },
     },
-    ...graph.resources.map((entry: { kind: "interface" | "package" | "build"; directory: string; source: Source }) => ({
-      kind: entry.kind,
-      source: entry.source,
-      directory: path.relative(workbench, path.resolve(workbench, entry.directory)),
-    })),
+    ...(await Promise.all(
+      graph.resources.map(
+        async (entry: { kind: "interface" | "package" | "build"; directory: string; source: Source }) => ({
+          kind: entry.kind,
+          source: entry.source,
+          directory: await managedResourcePath(workbench, entry.directory),
+        }),
+      ),
+    )),
   ];
   let baseline: string | undefined;
   try {
@@ -187,6 +198,34 @@ export type UpgradeEffects = {
   snapshot(root: string): Promise<string>;
   publish(root: string, commit: string): Promise<void>;
 };
+
+/** Review a successfully built immutable candidate using the same boundary as
+ * ordinary authoring checks. Execution storage compatibility is checked against
+ * the current graph at activation; the legacy evolution model is not its schema.
+ */
+export async function reviewUpgradeCandidate({
+  artifact,
+  baseline,
+  candidate,
+  reviews = [],
+}: {
+  artifact: string;
+  baseline: WorkspaceRevision | null;
+  candidate: WorkspaceRevision;
+  reviews?: EvolutionReview[];
+}) {
+  let execution = false;
+  try {
+    await fs.access(path.join(artifact, "execution-plan.json"));
+    execution = true;
+  } catch (error) {
+    if ((error as NodeJS.ErrnoException).code !== "ENOENT") throw error;
+  }
+  return execution
+    ? { filename: "semantic-review.json", review: reviewSemanticMajors(baseline, candidate, reviews) }
+    : { filename: "evolution.json", review: planEvolution(baseline, candidate, { reviews }) };
+}
+
 const effects: UpgradeEffects = {
   async check(node, root, output, spec) {
     if (node.kind === "workspace" && !spec.baseline && !spec.bootstrap)
@@ -206,10 +245,15 @@ const effects: UpgradeEffects = {
         ? (JSON.parse(await fs.readFile(spec.baseline, "utf8")) as WorkspaceRevision)
         : null;
       const reviews = spec.reviews ? (JSON.parse(await fs.readFile(spec.reviews, "utf8")) as EvolutionReview[]) : [];
-      const evolution = planEvolution(baseline, JSON.parse(candidate), { reviews });
-      await fs.writeFile(path.join(output, "evolution.json"), JSON.stringify(evolution, null, 2));
-      if (evolution.blockers.length)
-        throw new Error(`Refactor required in ${node.directory}: ${evolution.blockers.join("; ")}`);
+      const { filename, review } = await reviewUpgradeCandidate({
+        artifact,
+        baseline,
+        candidate: JSON.parse(candidate),
+        reviews,
+      });
+      await fs.writeFile(path.join(output, filename), JSON.stringify(review, null, 2));
+      if (review.blockers.length)
+        throw new Error(`Refactor required in ${node.directory}: ${review.blockers.join("; ")}`);
     }
   },
   async snapshot(root) {
@@ -368,10 +412,7 @@ export const applyPinUpgrades = async (
           previous.resources.map(async (entry: { kind: string; source: Source; directory: string }) => ({
             kind: entry.kind,
             ...entry.source,
-            directory: await location(
-              plan.workbench,
-              path.relative(plan.workbench, path.resolve(plan.workbench, entry.directory)),
-            ),
+            directory: await location(plan.workbench, await managedResourcePath(plan.workbench, entry.directory)),
           })),
         );
         for (const node of plan.nodes.filter((entry) => entry.kind !== "workspace")) {
@@ -443,13 +484,13 @@ export const applyPinUpgrades = async (
           quixos: compiled.lock.quixos,
           directResources: [...compiled.directResources.entries()].map(([bindingKey, node]) => {
             const [kind, binding] = bindingKey.split("\0");
-            return { kind, binding, resourceKey: node.key, directory: node.directory };
+            return { kind, binding, resourceKey: node.key, directory: path.relative(plan.workbench, node.directory) };
           }),
           resources: [...resources.values()].map((node) => ({
             key: node.key,
             kind: node.kind,
             source: node.source,
-            directory: node.directory,
+            directory: path.relative(plan.workbench, node.directory),
             ...(node.resource.kind === "build"
               ? {}
               : {

src/capability-language/source-backup.ts

@@ -0,0 +1,117 @@
+import { execFile as callback } from "node:child_process";
+import { promisify } from "node:util";
+import { createHash } from "node:crypto";
+import { createReadStream } from "node:fs";
+import { lstat, mkdir, mkdtemp, readFile, rename, rm, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { pathToFileURL } from "node:url";
+import { retentionTagForCommit } from "../resource-lock/index.js";
+import { materializeWorkspaceSources, workspaceSourcePin, type WorkspaceSourcePin } from "./source-closure.js";
+
+const exec = promisify(callback);
+type SourceBackup = {
+  formatVersion: 1;
+  root: WorkspaceSourcePin;
+  repositories: Array<{ repository: string; commits: string[]; bundle: string; sha256: string }>;
+};
+async function hash(filename: string) {
+  const digest = createHash("sha256");
+  for await (const chunk of createReadStream(filename)) digest.update(chunk);
+  return digest.digest("hex");
+}
+
+/** Source-only backup: no Graph state, checkout instructions or credentials.
+ * Git bundles retain exact commits and their ancestors without needing a forge.
+ * Storage/retention of the resulting directory belongs to the operator. */
+export async function backupWorkspaceSources(options: {
+  source: WorkspaceSourcePin;
+  directory: string;
+  output: string;
+  locations?: Record<string, string>;
+}): Promise<SourceBackup> {
+  const output = path.resolve(options.output);
+  if (
+    await lstat(output).catch((error: NodeJS.ErrnoException) => {
+      if (error.code !== "ENOENT") throw error;
+      return null;
+    })
+  )
+    throw Error("Source backup destination must not exist");
+  const closure = await materializeWorkspaceSources(options);
+  const grouped = new Map<string, Map<string, string>>();
+  for (const entry of closure.resources) {
+    const commits = grouped.get(entry.repository) ?? new Map<string, string>();
+    commits.set(entry.commit, path.join(path.resolve(options.directory), entry.directory));
+    grouped.set(entry.repository, commits);
+  }
+  await mkdir(path.dirname(output), { recursive: true });
+  const staging = await mkdtemp(path.join(path.dirname(output), ".source-backup-"));
+  const manifest: SourceBackup = { formatVersion: 1, root: closure.root, repositories: [] };
+  try {
+    for (const [repository, commits] of [...grouped].sort(([a], [b]) => a.localeCompare(b))) {
+      const bundle = createHash("sha256").update(repository).digest("hex") + ".bundle";
+      const gitDirectory = await mkdtemp(path.join(staging, ".git-"));
+      try {
+        await exec("git", ["init", "--bare", gitDirectory]);
+        const refs: string[] = [];
+        for (const [commit, checkout] of commits) {
+          const ref = retentionTagForCommit(commit);
+          await exec("git", ["-C", gitDirectory, "fetch", "--no-tags", "--", checkout, `${ref}:${ref}`]);
+          refs.push(ref);
+        }
+        await exec("git", ["-C", gitDirectory, "bundle", "create", path.join(staging, bundle), ...refs]);
+      } finally {
+        await rm(gitDirectory, { recursive: true, force: true });
+      }
+      manifest.repositories.push({
+        repository,
+        commits: [...commits.keys()].sort(),
+        bundle,
+        sha256: await hash(path.join(staging, bundle)),
+      });
+    }
+    await writeFile(path.join(staging, "backup.json"), JSON.stringify(manifest, null, 2) + "\n", { mode: 0o600 });
+    await rename(staging, output);
+    return manifest;
+  } finally {
+    await rm(staging, { recursive: true, force: true });
+  }
+}
+
+export async function restoreWorkspaceSources(options: { backup: string; directory: string }) {
+  const backup = path.resolve(options.backup);
+  const filename = path.join(backup, "backup.json");
+  const info = await lstat(filename);
+  if (!info.isFile() || info.isSymbolicLink() || info.size > 1024 * 1024) throw Error("Invalid source backup manifest");
+  const manifest = JSON.parse(await readFile(filename, "utf8")) as SourceBackup;
+  if (
+    manifest.formatVersion !== 1 ||
+    !Array.isArray(manifest.repositories) ||
+    !manifest.repositories.length ||
+    manifest.repositories.length > 256
+  )
+    throw Error("Invalid source backup manifest");
+  const root = workspaceSourcePin(manifest.root);
+  const locations: Record<string, string> = {};
+  for (const entry of manifest.repositories) {
+    if (!entry || !Array.isArray(entry.commits) || !entry.commits.length || entry.commits.length > 256)
+      throw Error("Invalid source backup entry");
+    for (const commit of entry.commits) workspaceSourcePin({ repository: entry.repository, commit });
+    if (Object.hasOwn(locations, entry.repository)) throw Error("Duplicate source backup repository");
+    const expected = createHash("sha256").update(entry.repository).digest("hex") + ".bundle";
+    if (entry.bundle !== expected || !/^[a-f0-9]{64}$/.test(entry.sha256))
+      throw Error("Invalid source backup bundle identity");
+    const bundle = path.join(backup, expected);
+    const stat = await lstat(bundle);
+    if (!stat.isFile() || stat.isSymbolicLink() || (await hash(bundle)) !== entry.sha256)
+      throw Error("Source backup bundle integrity mismatch");
+    locations[entry.repository] = pathToFileURL(bundle).href;
+  }
+  if (
+    !manifest.repositories.some((entry) => entry.repository === root.repository && entry.commits.includes(root.commit))
+  )
+    throw Error("Source backup does not retain its root commit");
+  // Every discovered dependency must use the backup. Never fall through to the
+  // original forge if a manifest omits a required repository.
+  return materializeWorkspaceSources({ source: root, directory: options.directory, locations, requireLocations: true });
+}

src/capability-language/source-check-driver.ts

@@ -2,7 +2,17 @@ import { buildImmutableCandidate } from "./checked-build.js";
 
 // Installed platform driver, run only inside the sealed checker's unprivileged
 // evaluator. Authored flakes never become the outer evaluator program.
-const [repository, commit, log] = process.argv.slice(2);
-if (!repository || !commit || !log || process.argv.length !== 5)
-  throw Error("source-check-driver REPOSITORY COMMIT LOG");
-process.stdout.write((await buildImmutableCandidate({ repository, commit }, "workspace", log)) + "\n");
+const [repository, commit, log, workspaceId] = process.argv.slice(2);
+if (!repository || !commit || !log || !workspaceId || process.argv.length !== 6)
+  throw Error("source-check-driver REPOSITORY COMMIT LOG WORKSPACE_ID");
+process.stdout.write(
+  (await buildImmutableCandidate(
+    { repository, commit },
+    "workspace",
+    log,
+    false,
+    undefined,
+    workspaceId,
+    process.env.QUIXOS_CHECK_PLATFORM_SOURCE ? JSON.parse(process.env.QUIXOS_CHECK_PLATFORM_SOURCE) : undefined,
+  )) + "\n",
+);

src/capability-language/source-closure.ts

@@ -0,0 +1,176 @@
+import { execFile as callback } from "node:child_process";
+import { promisify } from "node:util";
+import { createHash, randomUUID } from "node:crypto";
+import { mkdir, mkdtemp, lstat, realpath, rename, rm, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { loadQuixosLock, retentionTagForCommit } from "../resource-lock/index.js";
+
+const exec = promisify(callback);
+import { workspaceSourcePin, type WorkspaceSourcePin } from "./source-pin.js";
+export { workspaceSourcePin, type WorkspaceSourcePin } from "./source-pin.js";
+export type SourceClosureEntry = WorkspaceSourcePin & {
+  kind: "workspace" | "interface" | "package" | "build";
+  directory: string;
+};
+export type WorkspaceSourceClosure = {
+  formatVersion: 1;
+  root: WorkspaceSourcePin;
+  resources: SourceClosureEntry[];
+};
+
+/** Trusted transport substitutions preserve source identity. A mirror or bundle
+ * is explicitly selected, never tried automatically after an origin failure.
+ * Git authentication stays in the caller's Git configuration, outside metadata.
+ */
+export async function materializeWorkspaceSources(options: {
+  source: WorkspaceSourcePin;
+  directory: string;
+  locations?: Record<string, string>;
+  concurrency?: number;
+  maxRepositories?: number;
+  requireLocations?: boolean;
+  /** Optional acquisition boundary, enforced before fetching each dependency.
+   * It limits canonical identity; explicit transport substitutions remain a
+   * separate trusted operator decision. */
+  repositoryPrefix?: string;
+}): Promise<WorkspaceSourceClosure> {
+  const source = workspaceSourcePin(options.source);
+  const prefix = options.repositoryPrefix ? new URL(options.repositoryPrefix) : null;
+  if (
+    prefix &&
+    (prefix.protocol !== "https:" ||
+      prefix.username ||
+      prefix.password ||
+      prefix.search ||
+      prefix.hash ||
+      !prefix.pathname.endsWith("/") ||
+      /[%\\\\]/.test(prefix.pathname))
+  )
+    throw Error("Source repository prefix requires a credential-free HTTPS directory URL");
+  const concurrency = options.concurrency ?? 4,
+    maxRepositories = options.maxRepositories ?? 256;
+  if (
+    !Number.isInteger(concurrency) ||
+    concurrency < 1 ||
+    concurrency > 16 ||
+    !Number.isInteger(maxRepositories) ||
+    maxRepositories < 1 ||
+    maxRepositories > 4096
+  )
+    throw Error("Invalid source closure limits");
+  const locations = new Map(Object.entries(options.locations ?? {}));
+  for (const [canonical, location] of locations) {
+    workspaceSourcePin({ repository: canonical, commit: source.commit });
+    const url = new URL(location);
+    if (
+      !["https:", "file:"].includes(url.protocol) ||
+      url.username ||
+      url.password ||
+      url.search ||
+      url.hash ||
+      (url.protocol === "file:" && url.hostname !== "")
+    )
+      throw Error("Invalid source transport substitution");
+  }
+  await mkdir(options.directory, { recursive: true, mode: 0o700 });
+  const directory = await realpath(options.directory);
+  const entries = new Map<string, SourceClosureEntry>();
+  const pending: SourceClosureEntry[] = [];
+  const enqueue = (pin: WorkspaceSourcePin, kind: SourceClosureEntry["kind"]) => {
+    pin = workspaceSourcePin(pin);
+    const repository = new URL(pin.repository);
+    if (
+      prefix &&
+      (repository.origin !== prefix.origin ||
+        !repository.pathname.startsWith(prefix.pathname) ||
+        /[%\\\\]/.test(repository.pathname))
+    )
+      throw Error(`Source repository is outside the acquisition boundary: ${pin.repository}`);
+    if (options.requireLocations && !locations.has(pin.repository))
+      throw Error(`Source backup omits required repository: ${pin.repository}`);
+    const key = `${kind}\0${pin.repository}\0${pin.commit}`;
+    if (entries.has(key)) return;
+    if (entries.size >= maxRepositories) throw Error("Workspace source closure exceeds repository limit");
+    const name = `${kind}-${createHash("sha256").update(key).digest("hex").slice(0, 24)}`;
+    const entry = { ...pin, kind, directory: name };
+    entries.set(key, entry);
+    pending.push(entry);
+  };
+  enqueue(source, "workspace");
+  const git = async (cwd: string, args: string[]) =>
+    (
+      await exec("git", args, {
+        cwd,
+        env: { ...process.env, GIT_TERMINAL_PROMPT: "0" },
+        maxBuffer: 4 * 1024 * 1024,
+      })
+    ).stdout.trim();
+  const checkout = async (entry: SourceClosureEntry) => {
+    const destination = path.join(directory, entry.directory);
+    const verify = async () => {
+      const info = await lstat(destination);
+      if (!info.isDirectory() || info.isSymbolicLink() || (await realpath(destination)) !== destination)
+        throw Error("Source checkout must be a contained directory");
+      if ((await git(destination, ["rev-parse", "HEAD"])) !== entry.commit)
+        throw Error(`Source commit mismatch: ${entry.repository}`);
+      if (await git(destination, ["status", "--porcelain", "--untracked-files=all"]))
+        throw Error(`Source checkout was modified: ${entry.repository}`);
+    };
+    const existing = await lstat(destination).catch((error: NodeJS.ErrnoException) => {
+      if (error.code !== "ENOENT") throw error;
+      return null;
+    });
+    if (!existing) {
+      const staging = await mkdtemp(path.join(directory, ".fetch-"));
+      try {
+        await git(staging, ["init"]);
+        await git(staging, ["remote", "add", "origin", entry.repository]);
+        const ref = retentionTagForCommit(entry.commit);
+        // Full history supports normal jj development and independent bundles.
+        const location = locations.get(entry.repository) ?? entry.repository;
+        await git(staging, [
+          "fetch",
+          "--no-tags",
+          "--",
+          location.startsWith("file:") ? fileURLToPath(location) : location,
+          `${ref}:${ref}`,
+        ]);
+        await git(staging, ["checkout", "--detach", entry.commit]);
+        try {
+          await rename(staging, destination);
+        } catch (error) {
+          if (!["EEXIST", "ENOTEMPTY"].includes((error as NodeJS.ErrnoException).code ?? "")) throw error;
+        }
+      } finally {
+        await rm(staging, { recursive: true, force: true });
+      }
+    }
+    await verify();
+    const lock = await loadQuixosLock(path.join(destination, "quixos.lock"));
+    if (!lock.ok)
+      throw Error(`Invalid source lock in ${entry.repository}: ${lock.diagnostics.map((d) => d.message).join("; ")}`);
+    return lock.lock.resources;
+  };
+  // Bounded breadth-first batches resolve diamonds once and avoid recursive
+  // promise deadlocks. Completion order cannot affect the recorded closure.
+  while (pending.length) {
+    const batch = pending.splice(0, concurrency);
+    const results = await Promise.allSettled(batch.map(checkout));
+    for (const result of results) {
+      if (result.status === "rejected") throw result.reason;
+      for (const resource of result.value) enqueue(resource.source, resource.kind);
+    }
+  }
+  const closure: WorkspaceSourceClosure = {
+    formatVersion: 1,
+    root: source,
+    resources: [...entries.values()].sort((a, b) =>
+      `${a.kind}:${a.repository}@${a.commit}`.localeCompare(`${b.kind}:${b.repository}@${b.commit}`),
+    ),
+  };
+  const temporary = path.join(directory, `.closure-${randomUUID()}.json`);
+  await writeFile(temporary, JSON.stringify(closure, null, 2) + "\n", { flag: "wx", mode: 0o600 });
+  await rename(temporary, path.join(directory, "sources.json"));
+  return closure;
+}

src/capability-language/source-locks.ts

@@ -0,0 +1,48 @@
+import { readFile } from "node:fs/promises";
+import path from "node:path";
+import { loadQuixosLock, parseQuixosLockDocument, resolveQuixosLock } from "../resource-lock/index.js";
+import { editStructure } from "./structural-edits.js";
+import { workspaceSourcePin, type WorkspaceSourcePin } from "./source-closure.js";
+
+/** Inspect/rewrite the root and its declared imports only, using the same lock
+ * grammar as compilation. Return proposed file contents; publishing them and
+ * selecting a Graph remain the caller's separate responsibilities. */
+export async function workspaceSourceLocks(directory: string, input: unknown = []) {
+  if (!Array.isArray(input) || input.length > 256) throw Error("Invalid source lock replacements");
+  const replacements = new Map<string, WorkspaceSourcePin>();
+  const key = (source: WorkspaceSourcePin) => `${source.repository}\0${source.commit}`;
+  for (const entry of input) {
+    if (!entry || typeof entry !== "object") throw Error("Invalid source lock replacement");
+    const from = workspaceSourcePin(entry.from),
+      to = workspaceSourcePin(entry.to);
+    if (replacements.has(key(from))) throw Error("Duplicate source lock replacement");
+    replacements.set(key(from), to);
+  }
+  const lock = await loadQuixosLock(path.join(directory, "quixos.lock"));
+  if (!lock.ok) throw Error(`Invalid source lock: ${lock.diagnostics.map((d) => d.message).join("; ")}`);
+  const files = new Map<string, string>();
+  for (const filename of lock.lock.sourceFiles!) {
+    let source = await readFile(path.join(directory, filename), "utf8");
+    const parsed = parseQuixosLockDocument(source, filename);
+    if (!parsed.ok) throw Error("Source lock changed during inspection");
+    for (const dependency of parsed.document.resources) {
+      const replacement = replacements.get(key(dependency.source));
+      if (replacement)
+        source = editStructure(source, {
+          operation: "dependency",
+          kind: dependency.kind,
+          name: dependency.binding,
+          source: replacement,
+        });
+    }
+    files.set(filename, source);
+  }
+  const checked = await resolveQuixosLock(files.get("quixos.lock")!, async (filename) => {
+    const source = files.get(filename);
+    if (source === undefined) throw Error("Source lock import changed during inspection");
+    return source;
+  });
+  if (!checked.ok)
+    throw Error(`Invalid rewritten source locks: ${checked.diagnostics.map((d) => d.message).join("; ")}`);
+  return { lock: checked.lock, files: [...files].map(([path, source]) => ({ path, source })) };
+}

src/capability-language/source-pin.ts

@@ -0,0 +1,18 @@
+export type WorkspaceSourcePin = { repository: string; commit: string };
+
+export function workspaceSourcePin(value: unknown): WorkspaceSourcePin {
+  if (!value || typeof value !== "object" || Array.isArray(value)) throw Error("Invalid Workspace source pin");
+  const pin = value as WorkspaceSourcePin;
+  const url = new URL(pin.repository);
+  if (
+    url.protocol !== "https:" ||
+    url.username ||
+    url.password ||
+    url.search ||
+    url.hash ||
+    typeof pin.commit !== "string" ||
+    !/^(?:[a-f0-9]{40}|[a-f0-9]{64})$/.test(pin.commit)
+  )
+    throw Error("Workspace source pins require credential-free HTTPS and an exact commit");
+  return { repository: pin.repository, commit: pin.commit };
+}

src/capability-language/tool-cli.ts

@@ -54,6 +54,65 @@ const planSummary = (plan: Awaited<ReturnType<typeof planStructure>>) => ({
 
 const main = async () => {
   const [command, ...args] = process.argv.slice(2);
+  if (command === "source-locks") {
+    if (!args[0] || (args.length !== 1 && (args.length !== 3 || args[1] !== "--replacements")))
+      throw Error("source-locks DIRECTORY [--replacements JSON_FILE]");
+    const { workspaceSourceLocks } = await import("./source-locks.js");
+    const replacements = args[2] ? JSON.parse(await readFile(args[2], "utf8")) : [];
+    process.stdout.write(JSON.stringify(await workspaceSourceLocks(path.resolve(args[0]), replacements)) + "\n");
+    return;
+  }
+  if (["source-checkout", "source-develop", "source-backup", "source-restore"].includes(command!)) {
+    const args = ["source", command.slice("source-".length), ...process.argv.slice(3)];
+    const { materializeWorkspaceSources } = await import("./source-closure.js");
+    if (!args[2]) throw Error("source requires a pinned source JSON file");
+    const flags = new Map<string, string>();
+    for (let i = 3; i < args.length; i += 2) {
+      if (
+        ![
+          "--dir",
+          ...(args[1] !== "restore" ? ["--locations"] : []),
+          ...(args[1] === "checkout" ? ["--repository-prefix"] : []),
+          ...(args[1] === "develop" ? ["--cache", "--workspace-id"] : []),
+          ...(args[1] === "backup" ? ["--output"] : []),
+        ].includes(args[i]) ||
+        !args[i + 1] ||
+        flags.has(args[i])
+      )
+        throw Error("Invalid source command options; use qx-workspace help source");
+      flags.set(args[i], args[i + 1]);
+    }
+    if (!flags.get("--dir")) throw Error("source requires --dir DIRECTORY");
+    if (args[1] === "restore") {
+      const { restoreWorkspaceSources } = await import("./source-backup.js");
+      const result = await restoreWorkspaceSources({ backup: args[2], directory: path.resolve(flags.get("--dir")!) });
+      process.stdout.write(JSON.stringify(result, null, 2) + "\n");
+      return;
+    }
+    const locationsFile = flags.get("--locations");
+    const options = {
+      source: JSON.parse(await readFile(args[2], "utf8")),
+      directory: path.resolve(flags.get("--dir")!),
+      ...(locationsFile ? { locations: JSON.parse(await readFile(locationsFile, "utf8")) } : {}),
+      ...(flags.has("--repository-prefix") ? { repositoryPrefix: flags.get("--repository-prefix") } : {}),
+    };
+    let result;
+    if (args[1] === "develop") {
+      if (!flags.get("--cache")) throw Error("source develop requires --cache DIRECTORY");
+      const { prepareDevelopmentSources } = await import("./development-sources.js");
+      result = await prepareDevelopmentSources({
+        ...options,
+        cacheDirectory: path.resolve(flags.get("--cache")!),
+        ...(flags.has("--workspace-id") ? { workspaceId: flags.get("--workspace-id")! } : {}),
+      });
+    } else if (args[1] === "backup") {
+      if (!flags.get("--output")) throw Error("source backup requires --output DIRECTORY");
+      const { backupWorkspaceSources } = await import("./source-backup.js");
+      result = await backupWorkspaceSources({ ...options, output: path.resolve(flags.get("--output")!) });
+    } else result = await materializeWorkspaceSources(options);
+    process.stdout.write(JSON.stringify(result, null, 2) + "\n");
+    return;
+  }
   if (command === "source-manifest") {
     if (args.length !== 1) throw new Error("source-manifest WORKSPACE_ROOT");
     process.stdout.write(JSON.stringify(await qxSourceManifest(args[0])) + "\n");
@@ -197,10 +256,16 @@ const main = async () => {
   }
   if (command === "check-committed" && !args.includes("--help")) {
     const [kind, repository, commit, log, ...extra] = args;
-    if (!["workspace", "interface", "package", "build"].includes(kind) || !log || extra.length)
-      throw new Error("usage: quixos-qx check-committed workspace|interface|package|build REPOSITORY COMMIT LOG_FILE");
+    if (
+      !["workspace", "interface", "package", "build"].includes(kind) ||
+      !log ||
+      (extra.length !== 0 && (kind !== "workspace" || extra.length !== 2 || extra[0] !== "--workspace-id" || !extra[1]))
+    )
+      throw new Error(
+        "usage: quixos-qx check-committed workspace|interface|package|build REPOSITORY COMMIT LOG_FILE [--workspace-id ID]",
+      );
     process.stdout.write(
-      `${await buildImmutableCandidate({ repository, commit }, kind as "workspace" | "interface" | "package" | "build", log)}\n`,
+      `${await buildImmutableCandidate({ repository, commit }, kind as "workspace" | "interface" | "package" | "build", log, false, undefined, extra[1])}\n`,
     );
     return;
   }
@@ -530,6 +595,30 @@ const main = async () => {
     process.stdout.write(`${JSON.stringify(plan, null, 2)}\n`);
     return;
   }
+  if (command === "format" && (args[0] === "--check" || args[0] === "--write")) {
+    const check = args[0] === "--check",
+      files = args.slice(1);
+    if (!files.length || files.some((file) => file.startsWith("-")))
+      throw new Error("usage: quixos-qx format --check|--write FILE...");
+    for (const file of files) {
+      try {
+        const source = await readFile(file, "utf8"),
+          formatted = formatQx(source);
+        if (formatted === source) continue;
+        if (check) {
+          console.error(`Needs formatting: ${file}`);
+          process.exitCode = 1;
+        } else {
+          await writeFile(file, formatted);
+          console.log(`Formatted ${file}`);
+        }
+      } catch (error) {
+        console.error(`${file}: ${error instanceof Error ? error.message : error}`);
+        process.exitCode = 1;
+      }
+    }
+    return;
+  }
   const [file, flag, ...rest] = args;
   if (
     !file ||

src/capability-language/workspace-cli.ts

@@ -17,7 +17,7 @@ import {
 } from "../capability-model/index.js";
 
 const usage = `usage: quixos-workspace-compile --root DIRECTORY --checkout-root DIRECTORY
-       [--snapshot-map PATH] [--graph-out PATH] [--workspace-id ID] [--workspace-revision-id ID]
+       [--snapshot-map PATH] [--graph-out PATH] [--plan-out PATH] [--workspace-id ID] [--workspace-revision-id ID]
        [--source-root-commit GIT_REV] [--baseline PLAN_JSON] [--evolution-out PATH]
        [--reviews REVIEW_JSON] [--schemas-out PATH] [--execution-plan-out PATH] [--build-contexts-out PATH]
        [--query-generator BUILD_MODULE_PATH] [--checked-resources NIX_MAP]
@@ -41,6 +41,7 @@ const parseArgs = (args: string[]) => {
     rootDirectory,
     checkoutRoot,
     graphOut: values.get("--graph-out"),
+    planOut: values.get("--plan-out"),
     schemasOut: values.get("--schemas-out"),
     executionPlanOut: values.get("--execution-plan-out"),
     buildContextsOut: values.get("--build-contexts-out"),
@@ -84,6 +85,7 @@ const main = async () => {
       `${JSON.stringify(
         {
           formatVersion: 1,
+          workspaceId: assembled.workspace.workspaceId,
           quixos: assembled.lock.quixos,
           directResources: [...assembled.directResources.entries()].map(([bindingKey, node]) => {
             const [kind, binding] = bindingKey.split("\0");
@@ -118,7 +120,9 @@ const main = async () => {
   if (options.executionPlanOut || options.buildContextsOut) {
     const executionStarted = performance.now();
     const plan = compileExecutionPlan(assembled.workspace);
-    if (options.executionPlanOut) await writeFile(options.executionPlanOut, `${JSON.stringify(plan, null, 2)}\n`);
+    // Machine-consumed immutable metadata should not spend its bounded input
+    // reservation on indentation. Its parsed allocation is charged separately.
+    if (options.executionPlanOut) await writeFile(options.executionPlanOut, `${JSON.stringify(plan)}\n`);
     if (options.buildContextsOut)
       await writeFile(options.buildContextsOut, JSON.stringify(packageBuildContexts(plan.definition.bindingSchema)));
     profile("execution-plan-and-contexts", executionStarted);
@@ -155,7 +159,8 @@ const main = async () => {
       `${JSON.stringify(planEvolution(baseline, candidate, { reviews }), null, 2)}\n`,
     );
   }
-  process.stdout.write(`${JSON.stringify(candidate, null, 2)}\n`);
+  if (options.planOut) await writeFile(options.planOut, `${JSON.stringify(candidate)}\n`);
+  else process.stdout.write(`${JSON.stringify(candidate, null, 2)}\n`);
 };
 
 main().catch((error: unknown) => {

src/capability-model/evolution.ts

@@ -1,4 +1,5 @@
 import { createHash } from "node:crypto";
+import { setImmediate } from "node:timers/promises";
 import type { Binding, Conformance, DependencyBinding, PersistentAttachment, WorkspaceRevision } from "./types.js";
 import { validateWorkspaceRevision } from "./validation.js";
 
@@ -21,6 +22,89 @@ export const canonicalJson = (value: unknown): string => {
 };
 export const contentDigest = (value: unknown) =>
   `sha256:${createHash("sha256").update(canonicalJson(value)).digest("hex")}`;
+/** Same canonical bytes as contentDigest, without monopolizing a live host's
+ * event loop while verifying large immutable metadata. No validation is skipped.
+ * This is for asynchronous loading, not a different build/wire identity. */
+export async function contentDigestAsync(value: unknown): Promise<string> {
+  // An explicit stack visits each node once; recursive generator delegation
+  // otherwise forwards every token through every ancestor of a deep plan.
+  type Frame = { kind: "value" | "array" | "object"; value: unknown; index?: number; keys?: string[]; wrote?: boolean };
+  const hash = createHash("sha256"),
+    stack: Frame[] = [{ kind: "value", value }],
+    active = new WeakSet<object>();
+  let buffer = "",
+    sliceStarted = performance.now(),
+    steps = 0;
+  const append = (part: string) => {
+    buffer += part;
+    if (buffer.length >= 65536) {
+      hash.update(buffer);
+      buffer = "";
+    }
+  };
+  while (stack.length) {
+    const frame = stack[stack.length - 1]!;
+    if (frame.kind === "value") {
+      const value = frame.value;
+      if (value !== null && typeof value === "object") {
+        if (active.has(value)) throw new Error("Cannot hash cyclic JSON values");
+        active.add(value);
+        frame.index = 0;
+        if (Array.isArray(value)) {
+          frame.kind = "array";
+          append("[");
+        } else {
+          if (Object.getPrototypeOf(value) !== Object.prototype && Object.getPrototypeOf(value) !== null)
+            throw new Error("Expected a plain JSON object");
+          frame.kind = "object";
+          frame.keys = Object.keys(value).sort(compareText);
+          frame.wrote = false;
+          append("{");
+        }
+      } else {
+        append(canonicalJson(value));
+        stack.pop();
+      }
+    } else if (frame.kind === "array") {
+      const array = frame.value as unknown[];
+      if (frame.index === array.length) {
+        append("]");
+        active.delete(array);
+        stack.pop();
+      } else {
+        const index = frame.index!;
+        frame.index = index + 1;
+        if (index) append(",");
+        // Match canonicalJson's Array.map behavior for sparse arrays too.
+        if (index in array) stack.push({ kind: "value", value: array[index] });
+      }
+    } else {
+      const object = frame.value as Record<string, unknown>;
+      if (frame.index === frame.keys!.length) {
+        append("}");
+        active.delete(object);
+        stack.pop();
+      } else {
+        const index = frame.index!;
+        frame.index = index + 1;
+        const key = frame.keys![index]!,
+          entry = object[key];
+        if (entry !== undefined) {
+          if (frame.wrote) append(",");
+          frame.wrote = true;
+          append(JSON.stringify(key) + ":");
+          stack.push({ kind: "value", value: entry });
+        }
+      }
+    }
+    if (++steps % 512 === 0 && performance.now() - sliceStarted >= 8) {
+      await setImmediate();
+      sliceStarted = performance.now();
+    }
+  }
+  hash.update(buffer);
+  return `sha256:${hash.digest("hex")}`;
+}
 const semantic = (value: unknown): unknown => {
   if (Array.isArray(value)) return value.map(semantic);
   if (value && typeof value === "object")

src/execution-world/README.md

@@ -1,5 +1,11 @@
 # Closed execution plans and artifacts
 
+This page documents current compiler/runtime representations. Its universal
+artifact inventory, React metadata and overlapping world/installation structures
+are [known architectural gaps](../../../docs/ARCHITECTURE_STATUS.md), not the
+[core package contract](../../../docs/ARCHITECTURE.md). Historical LF task numbers
+refer to the original implementation sequence, not an active queue.
+
 `compileExecutionPlan` validates a workspace, links its checked queries, resolves
 public forwarding, and emits one versioned plan with an SHA-256 digest. It retains
 exact interface/package revisions and generic applications, owner initialization,
@@ -60,11 +66,11 @@ the core codec's canonical ordering and domain-separated SHA-256 framing. The
 monorepo `camino-execution-world` check compares the compiler and core implementations.
 No machine-local Nix path enters the world descriptor.
 
-The current binding schema is the closed workspace schema. This is conservative:
-an unrelated contract change can require checking/rebuilding several packages.
-LF-05 may narrow it to exact checked per-package closures, but must use the same
-schema for generation, receipts, and world validation. It must not substitute an
-older package schema just because the source revision did not change.
+Reusable package compilation now receives a canonical per-package build contract;
+exact source provenance and workspace linking remain separate. See
+[package build contracts](../../../docs/PACKAGE_BUILD_CONTRACTS.md). Generation,
+receipts and checking must agree on that contract; unchanged source alone does
+not justify reusing an incompatible binding schema.
 
 ## Transaction-port ABI
 

src/execution-world/artifacts.ts

@@ -1,6 +1,13 @@
+import {
+  executionPlanDigestAsync,
+  type ExecutionPlan,
+  type PlanPackage,
+  ExecutionPlanError,
+  hexDigest,
+  executionVersions,
+} from "./plan.js";
 import { createHash } from "node:crypto";
 import { canonicalJson } from "../capability-model/evolution.js";
-import { type ExecutionPlan, type PlanPackage, ExecutionPlanError, hexDigest, executionVersions } from "./plan.js";
 
 export interface ArtifactFile {
   path: string;
@@ -11,7 +18,7 @@ export interface ArtifactFile {
 export interface ArtifactImplementation {
   id: string;
   target: string;
-  compatibility: "quixos-service-v1" | "quixos-js-module-v1";
+  compatibility: "quixos-service-v1" | "quixos-js-module-v1" | "quixos-restricted-module-v1";
   path: string;
   ports: "quixos-transaction-ports-v1";
   registryExport?: string;
@@ -225,7 +232,11 @@ export function parseArtifactGroup(value: unknown): ArtifactGroup {
         ["registryExport"],
         path,
       );
-      if (entry.compatibility !== "quixos-service-v1" && entry.compatibility !== "quixos-js-module-v1")
+      if (
+        !["quixos-service-v1", "quixos-js-module-v1", "quixos-restricted-module-v1"].includes(
+          String(entry.compatibility),
+        )
+      )
         fail(path, "Unsupported artifact ABI");
       if (entry.ports !== "quixos-transaction-ports-v1") fail(path, "Unsupported transaction port ABI");
       if (
@@ -233,7 +244,9 @@ export function parseArtifactGroup(value: unknown): ArtifactGroup {
         (entry.target !== "server" || entry.registryExport !== undefined)
       )
         fail(path, "Service must target server and has no JS registry export");
-      if (entry.compatibility === "quixos-js-module-v1") text(entry.registryExport, `${path}.registryExport`);
+      if (entry.compatibility !== "quixos-service-v1") text(entry.registryExport, `${path}.registryExport`);
+      if (entry.compatibility === "quixos-restricted-module-v1" && entry.target !== "server")
+        fail(path, "Restricted modules must target server");
       const exports = array(entry.exports, `${path}.exports`).map((value) => text(value, `${path}.exports`));
       unique(exports, `${path}.exports`);
       const files = parseArtifactFiles(entry.files, `${path}.files`);
@@ -300,6 +313,11 @@ export function checkPackageCoverage(
     for (const id of implementation.exports) {
       const entry = expected.exports.find((e) => e.id === id);
       if (!entry) fail(implementation.id, `Unknown export ${id}`);
+      if (
+        implementation.compatibility === "quixos-restricted-module-v1" &&
+        (entry!.execution.kind === "remote" || !entry!.execution.targets.includes("server"))
+      )
+        fail(implementation.id, `Export ${id} does not promise restricted server computation`);
       if (
         implementation.target !== "server" &&
         (!entry?.execution ||
@@ -348,7 +366,7 @@ export async function checkExecutionWorld(
 ): Promise<CheckedWorld> {
   if (canonicalJson(plan.definition.versions) !== canonicalJson(executionVersions))
     fail("world", "Unsupported plan codec versions");
-  if (hexDigest(plan.definition) !== plan.digest) fail("plan", "Plan digest mismatch");
+  if ((await executionPlanDigestAsync(plan)) !== plan.digest) fail("plan", "Plan digest mismatch");
   const manifests = inputs.map(parsePackageArtifacts);
   unique(
     manifests.map((m) => m.packageRevisionId),

src/execution-world/candidate.ts

@@ -1,8 +1,12 @@
 import { graphExecutionRepresentation } from "./graph-execution.js";
 import { lstat } from "node:fs/promises";
 import { join } from "node:path";
-import { hexDigest, ExecutionPlanError, type ExecutionPlan } from "./plan.js";
-import { loadExecutionInstallation, type PackageInstallationSelection } from "./installation.js";
+import { hexDigest, hexDigestAsync, sealExecutionPlan, ExecutionPlanError, type ExecutionPlan } from "./plan.js";
+import {
+  loadExecutionInstallation,
+  createClientContractCatalog,
+  type PackageInstallationSelection,
+} from "./installation.js";
 import {
   candidateMetadataBudget,
   readCandidateMetadata,
@@ -11,7 +15,10 @@ import {
 } from "./metadata.js";
 const rootPattern = /^\/nix\/store\/[a-z0-9]{32}-[^/\s]+$/;
 async function readJson(root: string, file: string, scope: CandidateMetadataScope) {
-  const input = await readCandidateMetadata(join(root, file), scope, 32 * 1024 * 1024);
+  // Query Trees add checked projections to an already large application plan.
+  // The Reader now exceeds 32 MiB even without indentation. This file bound
+  // does not replace the stricter aggregate/owner parse-allocation budgets.
+  const input = await readCandidateMetadata(join(root, file), scope, 64 * 1024 * 1024);
   try {
     return {
       value: JSON.parse(new TextDecoder("utf-8", { fatal: true }).decode(input.bytes)),
@@ -36,33 +43,37 @@ export async function loadCheckedInstallationCandidate(
   if (!rootPattern.test(root) || !(await lstat(root)).isDirectory())
     throw Error("Candidate must be an immutable Nix output directory");
   const scope = (resources.budget ?? candidateMetadataBudget).acquire(resources.owner ?? root);
-  let releaseValidation = () => {};
   try {
+    // Validate the duplicated source contract by digest, then discard its tree
+    // before allocating the substantially larger checked execution plan.
+    const workspaceDigest = await (async () => {
+      const input = await readJson(root, "candidate.json", scope);
+      try {
+        const { executionContracts: _legacyContracts, ...workspace } = input.value;
+        return await hexDigestAsync(workspace);
+      } finally {
+        input.releaseTree();
+      }
+    })();
     // Sequential reads avoid partially rejected Promise.all() work allocating
     // after the failed candidate's reservation has been released.
     const values = [];
     for (const file of [
-      "candidate.json",
       "execution-plan.json",
       "execution-artifacts.json",
       "source.json",
       "entry.json",
       "kernel.json",
       "queries.json",
-      "graph-execution.json",
     ]) {
       const parsed = await readJson(root, file, scope);
       values.push(parsed.value);
-      // candidate.json duplicates the checked plan for validation. Nothing in
-      // the installed candidate retains this input tree after validation.
-      if (file === "candidate.json") releaseValidation = parsed.releaseTree;
     }
-    const [candidate, plan, artifacts, source, entryRequest, kernel, queries, graph] = values;
-    const { executionContracts: _legacyContracts, ...workspace } = candidate;
+    const [plan, artifacts, source, entryRequest, kernel, queries] = values;
     if (
       plan?.definition?.codec !== "camino-execution-plan-v1" ||
-      hexDigest(plan.definition) !== plan.digest ||
-      hexDigest(workspace) !== hexDigest(plan.definition.workspace)
+      !(await sealExecutionPlan(plan)) ||
+      workspaceDigest !== (await hexDigestAsync(plan.definition.workspace))
     )
       throw new ExecutionPlanError(
         "CANDIDATE_PLAN_MISMATCH",
@@ -106,21 +117,36 @@ export async function loadCheckedInstallationCandidate(
       ["kernel", kernel, "camino-kernel-program-v1"],
       ["queries", queries, "camino-query-program-v1"],
     ] as const)
-      if (program?.codec !== codec || program.plan !== kernel.plan || hexDigest(program) !== artifacts.programs?.[name])
+      if (
+        program?.codec !== codec ||
+        program.plan !== kernel.plan ||
+        (await hexDigestAsync(program)) !== artifacts.programs?.[name]
+      )
         throw new ExecutionPlanError(
           "CANDIDATE_PROGRAM_MISMATCH",
           name,
           "Stored interpreter input must match the checked build and plan",
         );
     const expectedGraph = graphExecutionRepresentation(plan, installation, kernel, queries);
-    if (hexDigest(graph) !== hexDigest(expectedGraph) || artifacts.execution !== hexDigest(graph))
-      throw new ExecutionPlanError(
-        "CANDIDATE_EXECUTION_MISMATCH",
-        root,
-        "Stored graph execution differs from checked inputs",
-      );
+    // The stored graph embeds the same kernel/query programs. Validate it in a
+    // short-lived scope and retain the representation that shares those trees.
+    const graphDigest = await (async () => {
+      const input = await readJson(root, "graph-execution.json", scope);
+      try {
+        const digest = await hexDigestAsync(input.value);
+        if (digest !== (await hexDigestAsync(expectedGraph)) || artifacts.execution !== digest)
+          throw new ExecutionPlanError(
+            "CANDIDATE_EXECUTION_MISMATCH",
+            root,
+            "Stored graph execution differs from checked inputs",
+          );
+        return digest;
+      } finally {
+        input.releaseTree();
+      }
+    })();
     const provenance = {
-      workspaceRevision: workspace.id as string,
+      workspaceRevision: plan.definition.workspace.id as string,
       source: { repository: source.repository as string, commit: source.commit as string },
       generator: artifacts.generator as string,
       packages: (plan as ExecutionPlan).definition.packages.map((pkg) => ({
@@ -139,30 +165,34 @@ export async function loadCheckedInstallationCandidate(
         programs: artifacts.programs,
       }),
     };
+    const catalog = createClientContractCatalog(plan, installation, scope, kernel);
     return {
       reference,
       workspace: plan.definition.workspace.workspaceId,
-      world: hexDigest(graph),
+      // The checked representation was already compared with this digest.
+      world: graphDigest,
       plan: kernel.plan as string,
-      graphExecution: graph,
+      graphExecution: expectedGraph,
       provenance,
       entry,
       kernel,
       queries,
       installation,
       executionPlan: plan as ExecutionPlan,
+      clientContractCatalog: catalog.select,
       metadata: {
         get bytes() {
           return scope.bytes;
         },
-        release: scope.release,
+        release: () => {
+          catalog.close();
+          scope.release();
+        },
       },
     };
   } catch (error) {
     scope.release();
     throw error;
-  } finally {
-    releaseValidation();
   }
 }
 

src/execution-world/client-contracts.ts

@@ -1,3 +1,4 @@
+import { executionPlanDigest, type ExecutionPlan, resolvePlannedOperation, ExecutionPlanError } from "./plan.js";
 import type {
   InterfaceRevision,
   InterfaceOperation,
@@ -6,11 +7,12 @@ import type {
 } from "../capability-model/types.js";
 import { canonicalJson } from "../capability-model/evolution.js";
 import { portableValueSchema, tsType } from "../bindings/portable.js";
-import { type ExecutionPlan, resolvePlannedOperation, hexDigest, ExecutionPlanError } from "./plan.js";
+
 import type { BindingSchema } from "../bindings/index.js";
 import type { PackageBuildContract } from "./build-contract.js";
 import { preparationArtifact, type ReactPreparationArtifact } from "../react-build/declarations.js";
 import { moduleTypeContext } from "./module-contracts.js";
+import { queryTreeBlueprint, queryTreeType } from "./query-trees.js";
 
 /** Public shape only: no slot inventory, implementation binding, or workspace identity. */
 export interface PublicOperationContract {
@@ -54,7 +56,7 @@ export function publicOperationContract(
 }
 /** Resolve a public contract to internal dispatch. This does not authorize the receiver. */
 export function linkInterfaceOperation(plan: ExecutionPlan, atom: string, contract: PublicOperationContract) {
-  if (hexDigest(plan.definition) !== plan.digest)
+  if (executionPlanDigest(plan) !== plan.digest)
     throw new ExecutionPlanError("INVALID_PLAN", atom, "Invalid execution plan digest");
   const iface = plan.definition.workspace.interfaceImports.find((i) => i.revisionId === contract.interface);
   const operation = iface?.members.flatMap((m) => m.operations).find((o) => o.id === contract.operation);
@@ -76,6 +78,7 @@ export interface PublicQueryContract {
   sourceQuery?: string;
   input: unknown;
   output: unknown;
+  tree?: ReturnType<typeof queryTreeBlueprint>;
 }
 export function publicQueryContract(pkg: PackageRevision, queryId: string): PublicQueryContract {
   const query = pkg.checkedQueries?.find((q) => q.declaration.id === queryId);
@@ -88,13 +91,14 @@ export function publicQueryContract(pkg: PackageRevision, queryId: string): Publ
     definitionDigest: query.definitionDigest,
     root: query.declaration.root,
     placement: placement?.kind ?? "server",
-    ...(placement?.kind === "local" ? { sourceQuery: placement.sourceQueryId } : {}),
+    ...(placement?.kind === "local" ? { sourceQuery: query.treeProjection?.tree ?? placement.sourceQueryId } : {}),
     input: portableValueSchema(query.variables),
     output: portableValueSchema(query.output),
+    ...(query.tree ? { tree: queryTreeBlueprint(pkg.revisionId, query) } : {}),
   };
 }
 export function linkPackageQuery(plan: ExecutionPlan, contract: PublicQueryContract) {
-  if (hexDigest(plan.definition) !== plan.digest)
+  if (executionPlanDigest(plan) !== plan.digest)
     throw new ExecutionPlanError("INVALID_PLAN", contract.query, "Invalid execution plan digest");
   const pkg = plan.definition.workspace.packageImports.find((p) => p.revisionId === contract.package);
   if (!pkg || canonicalJson(publicQueryContract(pkg, contract.query)) !== canonicalJson(contract))
@@ -156,10 +160,10 @@ export function generatePackageQueryClientBindings(
     checkedQueries: pkg.checkedQueries?.filter((query) => !internal.includes(query.declaration.id)),
   };
   const queries = (pkg.checkedQueries ?? [])
-    .filter((query) => !query.declaration.fragment)
+    .filter((query) => !query.declaration.fragment && !query.treeProjection)
     .map(
       (query) =>
-        `${JSON.stringify(query.declaration.displayName)}: definePackageQuery<${tsType(query.variables)}, ${tsType(query.output)}, ${JSON.stringify(publicQueryContract(pkg, query.declaration.id).placement)}>(${JSON.stringify(publicQueryContract(pkg, query.declaration.id))})`,
+        `${JSON.stringify(query.declaration.displayName)}: ${query.tree ? `definePackageQueryTree<${tsType(query.variables)}, ${queryTreeType(query)}, ${JSON.stringify(query.declaration.root.interface)}>` : `definePackageQuery<${tsType(query.variables)}, ${tsType(query.output)}, ${JSON.stringify(publicQueryContract(pkg, query.declaration.id).placement)}>`}(${JSON.stringify(publicQueryContract(pkg, query.declaration.id))})`,
     );
   const emitFragment = (provider: PackageRevision, id: string) => {
     const query = provider.checkedQueries?.find((query) => query.declaration.id === id);
@@ -210,7 +214,7 @@ export function generatePackageQueryClientBindings(
     fragments.push(
       `${JSON.stringify(alias)}: {${[...entries].map(([name, value]) => `${JSON.stringify(name)}: ${value}`).join(",")}}`,
     );
-  return `// Generated from checked package query contracts. Regenerate; do not edit.\nimport { definePackageQuery, definePackageFragment, type ManagedReference } from ${JSON.stringify(runtimeModule)};\nexport const queries = {${queries.join(",\n")}} as const;\nexport const fragments = {${fragments.join(",\n")}} as const;\n`;
+  return `// Generated from checked package query contracts. Regenerate; do not edit.\nimport { definePackageQuery, definePackageFragment, ${queries.some((query) => query.includes("definePackageQueryTree<")) ? "definePackageQueryTree, type QueryTreeShape, type QueryTreeOccurrence, " : ""}type ManagedReference } from ${JSON.stringify(runtimeModule)};\nexport const queries = {${queries.join(",\n")}} as const;\nexport const fragments = {${fragments.join(",\n")}} as const;\n`;
 }
 
 /** Receipt-covered bindings expose the package's imports, component subjects and
@@ -254,17 +258,7 @@ export function generatePackageComponentBindings(
           target.kind === "atom"
             ? `ManagedReference<"atom", ${JSON.stringify(target.atomId)}>`
             : `ManagedReference<"interface", ${JSON.stringify(target.interfaceRevisionId)}>`;
-        const fields =
-          target.kind === "interface"
-            ? find(target.interfaceRevisionId).members.flatMap((member) => {
-                if ((member.kind !== "value" && member.kind !== "relationship") || !member.queryRead) return [];
-                const getter = member.operations.find(
-                  (operation) => operation.displayName === (member.kind === "value" ? "get" : "resolve"),
-                );
-                return getter ? [`readonly ${JSON.stringify(member.displayName)}: ${tsType(getter.outputType)}`] : [];
-              })
-            : [];
-        return `{readonly reference: ${reference}; readonly values: {${fields.join(";")}}}`;
+        return `{readonly reference: ${reference}}`;
       })
       .join(",")}]`;
   const interfaces = generateInterfaceClientBindings(imports, "@quixos/camino-react", props);
@@ -279,7 +273,7 @@ export function generatePackageComponentBindings(
     .join("\n");
   return (
     interfaces +
-    '\nimport {createObjectRenderer,definePackageQuery,definePackageFragment,type ComponentType,type ComponentProps,type PresentationHandle} from "@quixos/camino-react";\n' +
+    '\nimport {createObjectRenderer,definePackageQuery,definePackageFragment,definePackageQueryTree,type QueryTreeShape,type QueryTreeOccurrence,type QueryTreeHandle,type ComponentType,type ComponentProps,type PresentationHandle} from "@quixos/camino-react";\n' +
     subjectBindings +
     "\n" +
     queries +
@@ -319,7 +313,13 @@ export function generatePackageComponentBindings(
           const handle = `PresentationHandle<${JSON.stringify(child.subject)}, ${extra}>`;
           return `readonly ${JSON.stringify(child.name)}: ${child.each ? `readonly ${handle}[]` : child.with || child.when ? `${handle} | null` : handle}`;
         });
-        const input = `${tsType(preparation.input ?? composition.output)} & {readonly children: {${children.join(";")}}}`;
+        const trees = (preparation.trees ?? []).map((tree) => {
+          const query = pkg.checkedQueries?.find((query) => query.declaration.id === tree.query);
+          if (!query?.tree)
+            throw new ExecutionPlanError("MISSING_QUERY_TREE", tree.query, "Expected a checked Query Tree");
+          return `readonly ${JSON.stringify(tree.name)}: QueryTreeHandle<${queryTreeType(query)}>`;
+        });
+        const input = `${tsType(preparation.input ?? composition.output)} & {readonly children: {${children.join(";")}}${trees.length ? `;readonly trees:{${trees.join(";")}}` : ""}}`;
         return `${JSON.stringify(component.displayName)}: ComponentType<ComponentProps<${JSON.stringify(component.subject)}, ${JSON.stringify(module.contract)}, ${moduleArguments(find(module.interfaceRevisionId))}, ${input}> & ExtraModuleProps<${JSON.stringify(key)}>>;`;
       })
       .join("\n") +

src/execution-world/execution-groups.ts

@@ -1,3 +1,4 @@
+import { executionPlanDigestAsync, type ExecutionPlan, hexDigest, hexDigestAsync, ExecutionPlanError } from "./plan.js";
 import { portableReflectionValue } from "./reflection.js";
 import type {
   BoundDependency,
@@ -6,7 +7,6 @@ import type {
   PersistentAttachment,
 } from "../capability-model/types.js";
 import { type ExecutionInstallation, type ExecutionGroupIdentity } from "./installation.js";
-import { type ExecutionPlan, hexDigest, ExecutionPlanError } from "./plan.js";
 
 export interface ExecutionEnvironment {
   /** Explicit host placement. Merely including an optional module does not select it. */
@@ -23,12 +23,12 @@ export interface InstalledExecutionGroup extends ExecutionGroupIdentity {
 }
 /** Conservative outbound closure. Runtime graph values, reverse callers, source
  * provenance and the workspace epoch are deliberately absent from this identity. */
-export function compileExecutionGroups(
+export async function compileExecutionGroups(
   plan: ExecutionPlan,
   installation: ExecutionInstallation,
   environments: Readonly<Record<string, ExecutionEnvironment>>,
-): InstalledExecutionGroup[] {
-  if (installation.plan !== plan.digest || hexDigest(plan.definition) !== plan.digest)
+): Promise<InstalledExecutionGroup[]> {
+  if (installation.plan !== plan.digest || (await executionPlanDigestAsync(plan)) !== plan.digest)
     throw new ExecutionPlanError("GROUP_PLAN_MISMATCH", plan.digest, "Expected one checked installation");
   const workspace = plan.definition.workspace;
   const packages = new Map(workspace.packageImports.map((p) => [p.revisionId as string, p]));
@@ -82,178 +82,175 @@ export function compileExecutionGroups(
   };
   const bindingContract = (value: DependencyBinding) =>
     value.kind === "query" ? { ...value, packageRevisionId: logical(value.packageRevisionId) } : value;
-  return installation.packages
-    .filter((p) => !!implementations.get(p.revision))
-    .map((root) => {
-      const consumed = new Map<string, unknown>(),
-        visited = new Set<string>(),
-        visitedQueries = new Set<string>(),
-        consumedPackages = new Set<string>();
-      const remember = (key: string, value: unknown) => consumed.set(key, value);
-      const storage = (id: string) => {
-        const value = attachments.get(id);
-        if (!value) throw new ExecutionPlanError("GROUP_STORAGE_MISSING", id, "Uninstalled consumed storage");
-        remember(`storage:${id}`, attachmentContract(value));
-      };
-      // Deletion may visit related objects and their owned state. Conservatively
-      // include the connected schema component, including possible future edges.
-      const lifecycle = (atom: string) => {
-        const visited = new Set<string>(),
-          pending = [atom];
-        const atoms = (
-          constraint: Extract<PersistentAttachment, { kind: "edge" }>["endpoints"][number]["constraint"],
-        ) =>
-          constraint.kind === "atom"
-            ? [constraint.atomId as string]
-            : workspace.conformances
-                .filter((c) => c.interfaceRevisionId === constraint.interfaceRevisionId)
-                .map((c) => c.atomId as string);
-        while (pending.length) {
-          const current = pending.pop()!;
-          if (visited.has(current)) continue;
-          visited.add(current);
-          for (const owner of workspace.conformances.filter((c) => c.atomId === current))
-            for (const attachment of owner.privateAttachments) storage(attachment.id);
-          for (const attachment of attachments.values())
-            if (attachment.kind === "edge" && attachment.endpoints.some((e) => atoms(e.constraint).includes(current))) {
-              storage(attachment.id);
-              pending.push(...attachment.endpoints.flatMap((e) => atoms(e.constraint)));
-            }
-        }
-      };
-      const targets = (binding: DependencyBinding, atom: string): string[] => {
-        if (binding.kind === "interface" && binding.receiver === "input")
-          return workspace.conformances
-            .filter((c) => c.interfaceRevisionId === binding.interfaceRevisionId)
-            .map((c) => c.atomId);
-        if (!("via" in binding) || !binding.via) return [atom];
-        storage(binding.via.edgeTypeId);
-        const edge = attachments.get(binding.via.edgeTypeId);
-        if (!edge || edge.kind !== "edge")
-          throw new ExecutionPlanError("GROUP_EDGE_MISSING", atom, "Missing traversal edge");
-        const endpoint = edge.endpoints.find((e) => e.projectionId !== binding.via!.projectionId)!;
-        const constraint = endpoint.constraint;
-        return constraint.kind === "atom"
-          ? [constraint.atomId]
+  const groups: InstalledExecutionGroup[] = [];
+  for (const root of installation.packages.filter((p) => !!implementations.get(p.revision))) {
+    const consumed = new Map<string, unknown>(),
+      visited = new Set<string>(),
+      visitedQueries = new Set<string>(),
+      consumedPackages = new Set<string>();
+    const remember = (key: string, value: unknown) => consumed.set(key, value);
+    const storage = (id: string) => {
+      const value = attachments.get(id);
+      if (!value) throw new ExecutionPlanError("GROUP_STORAGE_MISSING", id, "Uninstalled consumed storage");
+      remember(`storage:${id}`, attachmentContract(value));
+    };
+    // Deletion may visit related objects and their owned state. Conservatively
+    // include the connected schema component, including possible future edges.
+    const lifecycle = (atom: string) => {
+      const visited = new Set<string>(),
+        pending = [atom];
+      const atoms = (constraint: Extract<PersistentAttachment, { kind: "edge" }>["endpoints"][number]["constraint"]) =>
+        constraint.kind === "atom"
+          ? [constraint.atomId as string]
           : workspace.conformances
               .filter((c) => c.interfaceRevisionId === constraint.interfaceRevisionId)
-              .map((c) => c.atomId);
-      };
-      const query = (revision: string, id: string) => {
-        const key = JSON.stringify([revision, id]);
-        if (visitedQueries.has(key)) return;
-        visitedQueries.add(key);
-        const value = plan.definition.queries.find((q) => q.id === key);
-        if (!value) throw new ExecutionPlanError("GROUP_QUERY_MISSING", key, "Missing consumed query");
-        remember(`query:${JSON.stringify([logical(revision), id])}`, value.query.checked.definitionDigest);
-        for (const operation of value.operations) visit(operation);
-      };
-      const dependencies = (entry: PackageExport, bindings: readonly BoundDependency[], atom: string) => {
-        for (const bound of bindings) {
-          const target = bound.binding,
-            port = entry.dependencyPorts.find((p) => p.id === bound.portId)!;
-          if ("via" in target && target.via) storage(target.via.edgeTypeId);
-          if (target.kind === "reflection") {
-            for (const selector of target.selectors)
-              remember("reflection:" + selector, portableReflectionValue(workspace, selector));
-          } else if (target.kind === "state") storage(target.slotId);
-          else if (target.kind === "edge") storage(target.edgeTypeId);
-          else if (target.kind === "query") query(target.packageRevisionId, target.queryId);
-          else if (target.kind === "interface" && port.requirement.kind === "interface") {
-            const iface = workspace.interfaceImports.find((i) => i.revisionId === target.interfaceRevisionId)!;
-            for (const targetAtom of targets(target, atom))
-              for (const op of port.requirement.operations ??
-                iface.members.flatMap((m) => m.operations.map((o) => o.id)))
-                visit(JSON.stringify([targetAtom, target.interfaceRevisionId, op]));
-          } else if (target.kind === "creation") {
-            for (const seed of target.owners) {
-              const owner = workspace.conformances.find(
-                (c) => c.atomId === target.atomId && c.interfaceRevisionId === seed.interfaceRevisionId,
-              )!;
-              remember(`birth:${owner.id}`, {
-                id: owner.id,
-                atom: owner.atomId,
-                interface: owner.interfaceRevisionId,
-                initialization: owner.initialization ?? [],
-              });
-              for (const attachment of owner.privateAttachments) storage(attachment.id);
-            }
-          } else
-            throw new ExecutionPlanError(
-              "GROUP_DEPENDENCY_UNSUPPORTED",
-              bound.portId,
-              "Cannot establish execution reuse for this dependency",
-            );
-        }
-      };
-      const visit = (key: string) => {
-        if (visited.has(key)) return;
-        visited.add(key);
-        const operation = operations.get(key);
-        if (!operation) throw new ExecutionPlanError("GROUP_OPERATION_MISSING", key, "Missing consumed operation");
-        const binding = operation.binding;
-        if (binding.kind === "package") {
-          const pkg = packages.get(binding.packageRevisionId)!;
-          const implementation = implementations.get(pkg.revisionId);
-          if (!implementation)
-            throw new ExecutionPlanError(
-              "GROUP_IMPLEMENTATION_MISSING",
-              pkg.revisionId,
-              "Consumed package has no selected server implementation",
-            );
-          consumedPackages.add(pkg.packageId);
-          remember(`implementation:${pkg.packageId}`, {
-            digest: implementation.contentDigest,
-            environment: environment(pkg.revisionId),
-          });
-          const entry = pkg.exports.find((e) => e.id === binding.exportId)!;
-          const bindings = binding.dependencies.map((d) => ({ portId: d.portId, binding: bindingContract(d.binding) }));
-          const acceptance = (binding.acceptanceDependencies ?? []).map((d) => ({
-            portId: d.portId,
-            binding: bindingContract(d.binding),
-          }));
-          const contract = {
-            input: operation.input,
-            output: operation.output,
-            execution: operation.execution,
-            scope: operation.scope,
-            binding: {
-              package: pkg.packageId,
-              export: binding.exportId,
-              dependencies: bindings,
-              acceptanceDependencies: acceptance,
-            },
-          };
-          // Deduplicate aliases of the same bound export, rather than keying its owner by reverse callers.
-          remember(`binding:${hexDigest(contract)}`, contract);
-          dependencies(entry, binding.dependencies, operation.atomId);
-          if (entry.acceptanceExportId)
-            dependencies(
-              pkg.exports.find((e) => e.id === entry.acceptanceExportId)!,
-              binding.acceptanceDependencies ?? [],
-              operation.atomId,
-            );
-        } else {
-          remember(`operation:${key}`, operation);
-          if (binding.kind === "state") storage(binding.slotId);
-          if (binding.kind === "edge") storage(binding.edgeTypeId);
-          if (binding.kind === "lifecycle") lifecycle(operation.atomId);
-        }
-      };
-      for (const operation of plan.definition.operations)
-        if (operation.binding.kind === "package" && operation.binding.packageRevisionId === root.revision)
-          visit(operation.key);
-      const own = implementations.get(root.revision)!;
-      const exports = packages.get(root.revision)!.exports.map(({ displayName: _name, dependencyPorts, ...entry }) => ({
-        ...entry,
-        dependencyPorts: dependencyPorts.map(({ displayName: _name, ...port }) => port),
-      }));
-      const entries = [...consumed].sort(([a], [b]) => (a < b ? -1 : a > b ? 1 : 0));
-      return {
-        logicalId: logical(root.revision),
-        packageRevision: root.revision,
-        executionDigest: `sha256:${hexDigest({ implementation: own.contentDigest, exports, environment: environment(root.revision), versions: plan.definition.versions, consumed: entries })}`,
-        consumedPackages: [...consumedPackages].sort(),
-      };
+              .map((c) => c.atomId as string);
+      while (pending.length) {
+        const current = pending.pop()!;
+        if (visited.has(current)) continue;
+        visited.add(current);
+        for (const owner of workspace.conformances.filter((c) => c.atomId === current))
+          for (const attachment of owner.privateAttachments) storage(attachment.id);
+        for (const attachment of attachments.values())
+          if (attachment.kind === "edge" && attachment.endpoints.some((e) => atoms(e.constraint).includes(current))) {
+            storage(attachment.id);
+            pending.push(...attachment.endpoints.flatMap((e) => atoms(e.constraint)));
+          }
+      }
+    };
+    const targets = (binding: DependencyBinding, atom: string): string[] => {
+      if (binding.kind === "interface" && binding.receiver === "input")
+        return workspace.conformances
+          .filter((c) => c.interfaceRevisionId === binding.interfaceRevisionId)
+          .map((c) => c.atomId);
+      if (!("via" in binding) || !binding.via) return [atom];
+      storage(binding.via.edgeTypeId);
+      const edge = attachments.get(binding.via.edgeTypeId);
+      if (!edge || edge.kind !== "edge")
+        throw new ExecutionPlanError("GROUP_EDGE_MISSING", atom, "Missing traversal edge");
+      const endpoint = edge.endpoints.find((e) => e.projectionId !== binding.via!.projectionId)!;
+      const constraint = endpoint.constraint;
+      return constraint.kind === "atom"
+        ? [constraint.atomId]
+        : workspace.conformances
+            .filter((c) => c.interfaceRevisionId === constraint.interfaceRevisionId)
+            .map((c) => c.atomId);
+    };
+    const query = (revision: string, id: string) => {
+      const key = JSON.stringify([revision, id]);
+      if (visitedQueries.has(key)) return;
+      visitedQueries.add(key);
+      const value = plan.definition.queries.find((q) => q.id === key);
+      if (!value) throw new ExecutionPlanError("GROUP_QUERY_MISSING", key, "Missing consumed query");
+      remember(`query:${JSON.stringify([logical(revision), id])}`, value.query.checked.definitionDigest);
+      for (const operation of value.operations) visit(operation);
+    };
+    const dependencies = (entry: PackageExport, bindings: readonly BoundDependency[], atom: string) => {
+      for (const bound of bindings) {
+        const target = bound.binding,
+          port = entry.dependencyPorts.find((p) => p.id === bound.portId)!;
+        if ("via" in target && target.via) storage(target.via.edgeTypeId);
+        if (target.kind === "reflection") {
+          for (const selector of target.selectors)
+            remember("reflection:" + selector, portableReflectionValue(workspace, selector));
+        } else if (target.kind === "state") storage(target.slotId);
+        else if (target.kind === "edge") storage(target.edgeTypeId);
+        else if (target.kind === "query") query(target.packageRevisionId, target.queryId);
+        else if (target.kind === "interface" && port.requirement.kind === "interface") {
+          const iface = workspace.interfaceImports.find((i) => i.revisionId === target.interfaceRevisionId)!;
+          for (const targetAtom of targets(target, atom))
+            for (const op of port.requirement.operations ?? iface.members.flatMap((m) => m.operations.map((o) => o.id)))
+              visit(JSON.stringify([targetAtom, target.interfaceRevisionId, op]));
+        } else if (target.kind === "creation") {
+          for (const seed of target.owners) {
+            const owner = workspace.conformances.find(
+              (c) => c.atomId === target.atomId && c.interfaceRevisionId === seed.interfaceRevisionId,
+            )!;
+            remember(`birth:${owner.id}`, {
+              id: owner.id,
+              atom: owner.atomId,
+              interface: owner.interfaceRevisionId,
+              initialization: owner.initialization ?? [],
+            });
+            for (const attachment of owner.privateAttachments) storage(attachment.id);
+          }
+        } else
+          throw new ExecutionPlanError(
+            "GROUP_DEPENDENCY_UNSUPPORTED",
+            bound.portId,
+            "Cannot establish execution reuse for this dependency",
+          );
+      }
+    };
+    const visit = (key: string) => {
+      if (visited.has(key)) return;
+      visited.add(key);
+      const operation = operations.get(key);
+      if (!operation) throw new ExecutionPlanError("GROUP_OPERATION_MISSING", key, "Missing consumed operation");
+      const binding = operation.binding;
+      if (binding.kind === "package") {
+        const pkg = packages.get(binding.packageRevisionId)!;
+        const implementation = implementations.get(pkg.revisionId);
+        if (!implementation)
+          throw new ExecutionPlanError(
+            "GROUP_IMPLEMENTATION_MISSING",
+            pkg.revisionId,
+            "Consumed package has no selected server implementation",
+          );
+        consumedPackages.add(pkg.packageId);
+        remember(`implementation:${pkg.packageId}`, {
+          digest: implementation.contentDigest,
+          environment: environment(pkg.revisionId),
+        });
+        const entry = pkg.exports.find((e) => e.id === binding.exportId)!;
+        const bindings = binding.dependencies.map((d) => ({ portId: d.portId, binding: bindingContract(d.binding) }));
+        const acceptance = (binding.acceptanceDependencies ?? []).map((d) => ({
+          portId: d.portId,
+          binding: bindingContract(d.binding),
+        }));
+        const contract = {
+          input: operation.input,
+          output: operation.output,
+          execution: operation.execution,
+          scope: operation.scope,
+          binding: {
+            package: pkg.packageId,
+            export: binding.exportId,
+            dependencies: bindings,
+            acceptanceDependencies: acceptance,
+          },
+        };
+        // Deduplicate aliases of the same bound export, rather than keying its owner by reverse callers.
+        remember(`binding:${hexDigest(contract)}`, contract);
+        dependencies(entry, binding.dependencies, operation.atomId);
+        if (entry.acceptanceExportId)
+          dependencies(
+            pkg.exports.find((e) => e.id === entry.acceptanceExportId)!,
+            binding.acceptanceDependencies ?? [],
+            operation.atomId,
+          );
+      } else {
+        remember(`operation:${key}`, operation);
+        if (binding.kind === "state") storage(binding.slotId);
+        if (binding.kind === "edge") storage(binding.edgeTypeId);
+        if (binding.kind === "lifecycle") lifecycle(operation.atomId);
+      }
+    };
+    for (const operation of plan.definition.operations)
+      if (operation.binding.kind === "package" && operation.binding.packageRevisionId === root.revision)
+        visit(operation.key);
+    const own = implementations.get(root.revision)!;
+    const exports = packages.get(root.revision)!.exports.map(({ displayName: _name, dependencyPorts, ...entry }) => ({
+      ...entry,
+      dependencyPorts: dependencyPorts.map(({ displayName: _name, ...port }) => port),
+    }));
+    const entries = [...consumed].sort(([a], [b]) => (a < b ? -1 : a > b ? 1 : 0));
+    groups.push({
+      logicalId: logical(root.revision),
+      packageRevision: root.revision,
+      executionDigest: `sha256:${await hexDigestAsync({ implementation: own.contentDigest, exports, environment: environment(root.revision), versions: plan.definition.versions, consumed: entries })}`,
+      consumedPackages: [...consumedPackages].sort(),
     });
+  }
+  return groups;
 }

src/execution-world/graph-execution.ts

@@ -1,4 +1,5 @@
-import { ExecutionPlanError, hexDigest, type ExecutionPlan } from "./plan.js";
+import { executionPlanDigest, ExecutionPlanError, hexDigest, type ExecutionPlan } from "./plan.js";
+
 import type { ExecutionInstallation } from "./installation.js";
 
 /** Execution inputs, not build evidence. Nominal revision IDs remain dispatch
@@ -10,7 +11,7 @@ export function graphExecutionRepresentation(
   kernel: unknown,
   queries: unknown,
 ) {
-  if (installation.plan !== plan.digest || hexDigest(plan.definition) !== plan.digest)
+  if (installation.plan !== plan.digest || executionPlanDigest(plan) !== plan.digest)
     throw new ExecutionPlanError("GRAPH_PLAN_MISMATCH", "graph", "Expected one checked installation");
   if (
     !kernel ||

src/execution-world/inspection.ts

@@ -35,20 +35,23 @@ export interface InspectionTemplate {
 }
 /** A finite installed template per interface/lane, not a per-client query compiler.
  * Flags select public cache boundaries; normal scope identity bounds specialization. */
-export function compileInspectionTemplates(plan: ExecutionPlan) {
-  const kernel = compileKernelProgram(plan) as {
-    operations: {
-      key: string;
-      atom: string;
-      interface: string;
-      operation: string;
-      effect: string;
-      targets: string[];
-      unsupported: string | null;
-      output: unknown;
-      binding: { kind: string };
-    }[];
-  };
+export interface InspectionKernel {
+  operations: {
+    key: string;
+    atom: string;
+    interface: string;
+    operation: string;
+    effect: string;
+    targets: string[];
+    unsupported: string | null;
+    output: unknown;
+    binding: { kind: string };
+  }[];
+}
+export function compileInspectionTemplates(
+  plan: ExecutionPlan,
+  kernel: InspectionKernel = compileKernelProgram(plan) as InspectionKernel,
+) {
   const queries: unknown[] = [],
     contracts: PublicQueryContract[] = [],
     templates: InspectionTemplate[] = [];

src/execution-world/installation.ts

@@ -1,9 +1,10 @@
-import { compileInspectionTemplates, type InspectionTemplate } from "./inspection.js";
+import { executionPlanDigestAsync, ExecutionPlanError, type ExecutionPlan } from "./plan.js";
+import { compileInspectionTemplates, type InspectionTemplate, type InspectionKernel } from "./inspection.js";
 import path from "node:path";
 import { loadCheckedArtifactWorld } from "./receipts.js";
 import { contentArtifactUrl, loadArtifactWorld, type LoadedArtifactWorld } from "./files.js";
 import { selectArtifactImplementation, type ArtifactImplementation, type ComponentArtifact } from "./artifacts.js";
-import { ExecutionPlanError, hexDigest, type ExecutionPlan } from "./plan.js";
+
 import {
   publicOperationContract,
   publicQueryContract,
@@ -41,12 +42,13 @@ export interface ClientContractCatalog {
   }[];
 }
 /** Explicit projection prevents accidental spreading of filesystem roots or private bindings. */
-export function clientContractCatalog(
+export async function clientContractCatalog(
   plan: ExecutionPlan,
   installation: ExecutionInstallation,
   requestedPackages: readonly string[],
-): ClientContractCatalog {
-  if (installation.plan !== plan.digest || hexDigest(plan.definition) !== plan.digest)
+  checkedKernel?: InspectionKernel,
+): Promise<ClientContractCatalog> {
+  if (installation.plan !== plan.digest || (await executionPlanDigestAsync(plan)) !== plan.digest)
     throw new ExecutionPlanError(
       "CATALOG_PLAN_MISMATCH",
       plan.digest,
@@ -69,7 +71,7 @@ export function clientContractCatalog(
           .map((operation) => publicOperationContract(iface, operation)),
       ),
     );
-  const inspection = compileInspectionTemplates(plan);
+  const inspection = compileInspectionTemplates(plan, checkedKernel);
   return {
     inspections: inspection.templates,
     resultInterfaces: Object.fromEntries(
@@ -98,6 +100,83 @@ export function clientContractCatalog(
   };
 }
 
+/** Candidate-owned compiler output, never graph state or authorization. Compile
+ * once, then project each requested package set without hashing/recompiling the
+ * plan. Reserve bounded metadata before compilation; disposal releases both the
+ * catalog and its charge. Callers must supply the candidate's checked inputs. */
+export function createClientContractCatalog(
+  plan: ExecutionPlan,
+  installation: ExecutionInstallation,
+  metadata: CandidateMetadataScope,
+  checkedKernel?: InspectionKernel,
+) {
+  const revisions = plan.definition.workspace.packageImports.map((pkg) => pkg.revisionId);
+  const installed = new Set<string>(revisions);
+  let catalog: ClientContractCatalog | undefined;
+  let preparing: Promise<void> | undefined;
+  let release: (() => void) | undefined;
+  let closed = false;
+  const freeze = (value: unknown, seen = new WeakSet<object>()) => {
+    if (!value || typeof value !== "object" || seen.has(value)) return;
+    seen.add(value);
+    for (const child of Object.values(value)) freeze(child, seen);
+    Object.freeze(value);
+  };
+  return {
+    async select(requestedPackages: readonly string[]): Promise<ClientContractCatalog> {
+      if (closed) throw Error("CANDIDATE_METADATA_CLOSED");
+      for (const revision of requestedPackages)
+        if (!installed.has(revision))
+          throw new ExecutionPlanError("UNINSTALLED_PACKAGE", revision, "Requested catalog package is not installed");
+      if (!catalog) {
+        // Like other candidate admission charges, this is an allocation estimate,
+        // not a V8 heap limit. The process/cgroup ceiling bounds transient work.
+        preparing ??= (async () => {
+          const reservation = metadata.reserve(32 * 1024 * 1024);
+          try {
+            const compiled = await clientContractCatalog(plan, installation, revisions, checkedKernel);
+            if (closed) throw Error("CANDIDATE_METADATA_CLOSED");
+            const bytes = Buffer.byteLength(JSON.stringify(compiled));
+            if (bytes > 8 * 1024 * 1024) throw Error("CANDIDATE_CATALOG_LIMIT");
+            freeze(compiled);
+            // No await between reservations: replacing the transient upper bound
+            // with a smaller retained estimate cannot race another admission.
+            reservation();
+            release = metadata.reserve(Math.max(64 * 1024, bytes * 4));
+            catalog = compiled;
+          } catch (error) {
+            reservation();
+            throw error;
+          }
+        })().finally(() => {
+          preparing = undefined;
+        });
+        await preparing;
+      }
+      if (closed || !catalog) throw Error("CANDIDATE_METADATA_CLOSED");
+      const requested = new Set(requestedPackages);
+      return {
+        inspections: catalog.inspections,
+        resultInterfaces: catalog.resultInterfaces,
+        operations: catalog.operations,
+        queries: [
+          ...catalog.queries.filter((query) => !installed.has(query.package)),
+          ...requestedPackages.flatMap((revision) => catalog!.queries.filter((query) => query.package === revision)),
+        ],
+        components: catalog.components.filter((component) => requested.has(component.packageRevision)),
+        moduleBindings: catalog.moduleBindings.filter((binding) => requested.has(binding.packageRevision)),
+        presentations: catalog.presentations.filter((presentation) => requested.has(presentation.packageRevision)),
+      };
+    },
+    close() {
+      closed = true;
+      catalog = undefined;
+      release?.();
+      release = undefined;
+    },
+  };
+}
+
 export interface PackageInstallationSelection {
   readonly browser?: { readonly id?: string };
   readonly service?: { readonly id?: string };
@@ -113,6 +192,8 @@ export interface ExecutionInstallation {
     readonly root: string;
     readonly service?: ArtifactImplementation;
     readonly module?: ArtifactImplementation;
+    /** Checked candidate only; the qualified host verifies its import surface and SDK. */
+    readonly restricted?: ArtifactImplementation;
     readonly browserImplementation?: ArtifactImplementation;
     readonly browserURL?: string;
     readonly browserRegistry?: string;
@@ -251,6 +332,11 @@ function assembleExecutionInstallation(
           exports: exports.map((entry) => entry.id),
         })
       : undefined;
+    const restrictedCandidates = manifest.implementations.filter(
+      (entry) => entry.compatibility === "quixos-restricted-module-v1",
+    );
+    if (restrictedCandidates.length > 1) fail(revision, "Ambiguous restricted module candidates");
+    const restricted = restrictedCandidates[0];
     const browserExports = exports.filter(
       (entry) =>
         entry.execution.kind !== "remote" &&
@@ -258,7 +344,13 @@ function assembleExecutionInstallation(
     );
     if (!browserExports.length) {
       if (selection.browser) fail(revision, "Package has no browser exports to select");
-      packages.push({ revision, root, ...(service ? { service } : {}), ...(module ? { module } : {}) });
+      packages.push({
+        revision,
+        root,
+        ...(service ? { service } : {}),
+        ...(module ? { module } : {}),
+        ...(restricted ? { restricted } : {}),
+      });
       continue;
     }
     const browser = selectArtifactImplementation(manifest, {
@@ -289,6 +381,7 @@ function assembleExecutionInstallation(
       root,
       ...(service ? { service } : {}),
       ...(module ? { module } : {}),
+      ...(restricted ? { restricted } : {}),
       browserImplementation: browser,
       browserURL: contentArtifactUrl(entry),
       browserRegistry: browser.registryExport,

src/execution-world/kernel.ts

@@ -1,3 +1,4 @@
+import { executionPlanDigest, type ExecutionPlan, ExecutionPlanError, hexDigest } from "./plan.js";
 import { portableReflectionType, portableReflectionValue } from "./reflection.js";
 import type {
   ValueType,
@@ -7,7 +8,7 @@ import type {
   BoundDependency,
   PackageExport,
 } from "../capability-model/types.js";
-import { type ExecutionPlan, ExecutionPlanError, hexDigest } from "./plan.js";
+
 import { portableValueSchema } from "../bindings/portable.js";
 import { subscriptionContract } from "../capability-model/journals.js";
 type PreparedStep = string | null | { case: string; id: string };
@@ -25,7 +26,7 @@ function preparedInputPaths(type: ValueType, path: PreparedStep[] = []): Prepare
 }
 /** Small data-only interpreter input; no compiler, parser, Node module or SQL dependency reaches the browser. */
 export function compileKernelProgram(plan: ExecutionPlan): unknown {
-  if (hexDigest(plan.definition) !== plan.digest)
+  if (executionPlanDigest(plan) !== plan.digest)
     throw new ExecutionPlanError("INVALID_PLAN", "kernel", "Plan digest mismatch");
   const workspace = plan.definition.workspace;
   if (workspace.sharedAttachments.some((attachment) => attachment.kind !== "edge"))

src/execution-world/metadata.ts

@@ -1,6 +1,9 @@
 import { constants } from "node:fs";
 import { open } from "node:fs/promises";
 
+const admissionFailure = (code: string, kind: "file-bytes", measured: number, limit: number) =>
+  Object.assign(Error(code), { metadataAdmission: { kind, measured, limit } });
+
 /** Admission estimates, not a hard V8 heap limit. A process/cgroup ceiling is
  * still required. Charge input, parse trees and derived indexes before reading
  * or parsing. Each live candidate retains its reservation until explicit close. */
@@ -9,7 +12,11 @@ export class CandidateMetadataBudget {
   private bytes = 0;
   private scopes = 0;
   private readonly owners = new Map<string, number>();
-  constructor(limits = { bytes: 512 * 1024 * 1024, ownerBytes: 256 * 1024 * 1024, candidates: 128 }) {
+  // A cutover holds both the serving and proposed installation plus transient
+  // parsing space. The Reader with checked Query Trees retains ~176 MiB per
+  // installation; its replacement also needs transient parse/index space.
+  // Keep the aggregate ceiling independent and leave room for parsing overlap.
+  constructor(limits = { bytes: 768 * 1024 * 1024, ownerBytes: 512 * 1024 * 1024, candidates: 128 }) {
     for (const value of Object.values(limits))
       if (!Number.isSafeInteger(value) || value < 1) throw Error("INVALID_CANDIDATE_METADATA_BUDGET");
     if (limits.ownerBytes > limits.bytes) throw Error("INVALID_CANDIDATE_METADATA_BUDGET");
@@ -18,6 +25,9 @@ export class CandidateMetadataBudget {
   snapshot() {
     return { bytes: this.bytes, candidates: this.scopes, owners: this.owners.size, limits: this.limits };
   }
+  ownedBytes(owner: string) {
+    return this.owners.get(owner) ?? 0;
+  }
   acquire(owner: string) {
     if (!owner || owner.length > 4096) throw Error("INVALID_CANDIDATE_METADATA_OWNER");
     if (this.scopes >= this.limits.candidates) throw Error("CANDIDATE_METADATA_LIMIT");
@@ -109,8 +119,8 @@ export async function readCandidateMetadata(
   let releaseInput: (() => void) | undefined;
   try {
     const stat = await handle.stat();
-    if (!stat.isFile() || !Number.isSafeInteger(stat.size) || stat.size > limit)
-      throw Error("CANDIDATE_METADATA_FILE_LIMIT");
+    if (!stat.isFile() || !Number.isSafeInteger(stat.size)) throw Error("CANDIDATE_METADATA_FILE_LIMIT");
+    if (stat.size > limit) throw admissionFailure("CANDIDATE_METADATA_FILE_LIMIT", "file-bytes", stat.size, limit);
     // Reserve the input buffer and UTF-16 decoding before allocating either.
     releaseInput = scope.reserve((stat.size + 1) * 3);
     const bytes = Buffer.alloc(stat.size + 1);

src/execution-world/placement.ts

@@ -1,6 +1,7 @@
+import { executionPlanDigest, ExecutionPlanError, hexDigest, type ExecutionPlan } from "./plan.js";
 import { parse } from "@babel/parser";
 import { builtinModules } from "node:module";
-import { ExecutionPlanError, hexDigest, type ExecutionPlan } from "./plan.js";
+
 import type { ExecutionInstallation } from "./installation.js";
 import type { ArtifactImplementation, ArtifactReader } from "./artifacts.js";
 
@@ -23,6 +24,75 @@ export interface ImportFinding {
   readonly detail: string;
   readonly line: number | null;
 }
+export const restrictedSDKSpecifier = "quixos:restricted-sdk/v1";
+export const restrictedSDKPath = "share/quixos/restricted/core.mjs";
+
+/** Compare trusted SDK syntax without build-machine paths in source comments.
+ * Keep literal/directive spelling and every executable AST node. This is SDK
+ * compatibility only: artifact files and the executed host SDK still have exact
+ * byte digests, and authored SDK bytes are never loaded by the restricted host.
+ */
+export function restrictedSDKIdentity(source: string): string {
+  if (Buffer.byteLength(source) > 2 * 1024 * 1024) throw Error("RESTRICTED_SDK_ANALYSIS_LIMIT");
+  const syntax = parse(source, { sourceType: "module", attachComment: false });
+  const metadata = new Set([
+    "start",
+    "end",
+    "loc",
+    "comments",
+    "leadingComments",
+    "innerComments",
+    "trailingComments",
+    "parenStart",
+  ]);
+  let nodes = 0;
+  const encoded = JSON.stringify(syntax, (key, value) => {
+    if (metadata.has(key)) return undefined;
+    if (value && typeof value === "object" && typeof value.type === "string" && ++nodes > 100000)
+      throw Error("RESTRICTED_SDK_ANALYSIS_LIMIT");
+    return value;
+  });
+  return hexDigest({ codec: "quixos-restricted-sdk-syntax-v1", syntax: JSON.parse(encoded) });
+}
+
+/** Mechanical candidate checks, not authorization or an engine-safety proof.
+ * The caller must first verify the manifest and all declared file digests. */
+export async function inspectRestrictedImplementation(
+  revision: string,
+  implementation: ArtifactImplementation,
+  read: ArtifactReader,
+  qualifiedSDKIdentity?: string,
+): Promise<ImportFinding[]> {
+  const entry = implementation.files.find((file) => file.path === implementation.path);
+  const sdk = implementation.files.find((file) => file.path === restrictedSDKPath);
+  if (
+    implementation.compatibility !== "quixos-restricted-module-v1" ||
+    implementation.target !== "server" ||
+    implementation.files.length !== 2 ||
+    !entry ||
+    !sdk ||
+    entry === sdk ||
+    entry.mediaType !== "text/javascript" ||
+    sdk.mediaType !== "text/javascript" ||
+    !/^[$A-Z_a-z][$\w]*$/.test(implementation.registryExport ?? "")
+  )
+    return [{ code: "RESTRICTED_CLOSURE", detail: "Expected one closed module and the restricted SDK", line: null }];
+  if (entry.bytes > 1024 * 1024 || sdk.bytes > 2 * 1024 * 1024)
+    return [{ code: "ANALYSIS_LIMIT", detail: "Restricted closure exceeds the source budget", line: null }];
+  if (qualifiedSDKIdentity) {
+    const source = Buffer.from(await read(revision, sdk.path, sdk.bytes)).toString("utf8");
+    try {
+      if (restrictedSDKIdentity(source) !== qualifiedSDKIdentity) throw Error("SDK syntax differs");
+    } catch {
+      return [
+        { code: "RESTRICTED_SDK_UNSUPPORTED", detail: "SDK differs from the qualified host profile", line: null },
+      ];
+    }
+  }
+  return inspectJavaScriptSurface(Buffer.from(await read(revision, entry.path, entry.bytes)).toString("utf8"), [
+    restrictedSDKSpecifier,
+  ]);
+}
 const nativeImports = new Set(builtinModules.flatMap((name) => [name, name.replace(/^node:/, "")]));
 const ambient = new Set([
   "process",
@@ -136,16 +206,14 @@ export function inspectJavaScriptSurface(source: string, checkedSDKImports: read
   return findings;
 }
 
-/** Derived metadata only. Browser/server portability and available targets say
- * nothing about sandbox eligibility. Build reports have no platform approval
- * catalog, so they conservatively require VM placement. A host can override
- * placement only for independently reviewed, exact restricted-code approvals. */
+/** Derived metadata only. A build report can describe a closed candidate but
+ * cannot qualify the host's engine, SDK, OS sandbox or resource controller. */
 export async function reportExecutionPlacement(
   plan: ExecutionPlan,
   installation: ExecutionInstallation,
   read: ArtifactReader,
 ) {
-  if (installation.plan !== plan.digest || hexDigest(plan.definition) !== plan.digest)
+  if (installation.plan !== plan.digest || executionPlanDigest(plan) !== plan.digest)
     throw new ExecutionPlanError(
       "PLACEMENT_PLAN_MISMATCH",
       plan.digest,
@@ -156,11 +224,13 @@ export async function reportExecutionPlacement(
   const packages = await Promise.all(
     installation.packages.map(async (pkg) => {
       const implementations: { id: string; digest: string; compatibility: string; findings: ImportFinding[] }[] = [];
-      for (const implementation of [pkg.service, pkg.module].filter(
+      for (const implementation of [pkg.service, pkg.module, pkg.restricted].filter(
         (entry): entry is ArtifactImplementation => !!entry,
       )) {
         let findings: ImportFinding[];
-        if (implementation.compatibility === "quixos-js-module-v1") {
+        if (implementation.compatibility === "quixos-restricted-module-v1")
+          findings = await inspectRestrictedImplementation(pkg.revision, implementation, read);
+        else if (implementation.compatibility === "quixos-js-module-v1") {
           const file = implementation.files.find((file) => file.path === implementation.path)!;
           if (!file || file.bytes > 1024 * 1024)
             findings = [
@@ -192,7 +262,14 @@ export async function reportExecutionPlacement(
         revision: pkg.revision,
         requiresVM: implementations.length > 0,
         restrictedEligible: false as const,
-        reason: "NO_QUALIFIED_RESTRICTED_RUNTIME",
+        reason: pkg.restricted ? "HOST_PROFILE_QUALIFICATION_REQUIRED" : "NO_RESTRICTED_IMPLEMENTATION",
+        restrictedCandidate: pkg.restricted
+          ? {
+              digest: pkg.restricted.contentDigest,
+              exports: pkg.restricted.exports,
+              compatible: implementations.find((entry) => entry.id === pkg.restricted!.id)!.findings.length === 0,
+            }
+          : null,
         implementations,
       };
     }),

src/execution-world/plan.ts

@@ -11,12 +11,13 @@ import type {
   OperationId,
 } from "../capability-model/types.js";
 import { validateWorkspaceRevision } from "../capability-model/validation.js";
-import { canonicalJson, contentDigest } from "../capability-model/evolution.js";
+import { canonicalJson, contentDigest, contentDigestAsync } from "../capability-model/evolution.js";
 import { resolveForwardedBinding } from "../capability-model/forwarding.js";
 import { linkQueries, type LinkedQuery } from "../query/link.js";
 import { type BindingSchema } from "../bindings/index.js";
 import { unsupportedQueryOperator } from "./query-operators.js";
 import { packageBuildContexts } from "./build-contract.js";
+import { setImmediate } from "node:timers/promises";
 
 export class ExecutionPlanError extends Error {
   constructor(
@@ -29,6 +30,56 @@ export class ExecutionPlanError extends Error {
   }
 }
 export const hexDigest = (value: unknown): string => contentDigest(value).slice("sha256:".length);
+export const hexDigestAsync = async (value: unknown): Promise<string> =>
+  (await contentDigestAsync(value)).slice("sha256:".length);
+// Checked runtime metadata is owned JSON, not live Graph data. Reuse its proof
+// only after every reachable record is immutable. Weak keys retain neither old
+// Candidates nor an application cache; unsealed compiler inputs are rehashed.
+const sealedPlanDigests = new WeakMap<ExecutionPlan, string>();
+export const executionPlanDigest = (plan: ExecutionPlan): string =>
+  sealedPlanDigests.get(plan) ?? hexDigest(plan.definition);
+export const executionPlanDigestAsync = async (plan: ExecutionPlan): Promise<string> =>
+  sealedPlanDigests.get(plan) ?? (await hexDigestAsync(plan.definition));
+/** Transfers owned parsed JSON into immutable runtime metadata. Freeze before
+ * yielding to hashing so concurrent mutation cannot invalidate the proof. */
+export async function sealExecutionPlan(plan: ExecutionPlan): Promise<boolean> {
+  if (sealedPlanDigests.has(plan)) return true;
+  if (!Object.hasOwn(plan, "definition") || !Object.hasOwn(plan, "digest")) return false;
+  const pending: object[] = [plan],
+    seen = new WeakSet<object>();
+  let sliceStarted = performance.now(),
+    count = 0;
+  while (pending.length) {
+    const value = pending.pop()!;
+    if (seen.has(value)) continue;
+    if (
+      !Array.isArray(value) &&
+      Object.getPrototypeOf(value) !== Object.prototype &&
+      Object.getPrototypeOf(value) !== null
+    )
+      throw new ExecutionPlanError("INVALID_PLAN_JSON", "plan", "Expected owned JSON records");
+    for (const key of Reflect.ownKeys(value)) {
+      const descriptor = Object.getOwnPropertyDescriptor(value, key)!;
+      if (typeof key !== "string" || !Object.hasOwn(descriptor, "value"))
+        throw new ExecutionPlanError(
+          "INVALID_PLAN_JSON",
+          "plan",
+          "Runtime metadata cannot contain accessors or symbols",
+        );
+      if (descriptor.value !== null && typeof descriptor.value === "object") pending.push(descriptor.value);
+    }
+    Object.freeze(value);
+    seen.add(value);
+    if (++count % 1024 === 0 && performance.now() - sliceStarted >= 8) {
+      await setImmediate();
+      sliceStarted = performance.now();
+    }
+  }
+  const digest = await hexDigestAsync(plan.definition);
+  if (digest !== plan.digest) return false;
+  sealedPlanDigests.set(plan, digest);
+  return true;
+}
 const sorted = <T>(values: readonly T[], key: (value: T) => string): T[] =>
   [...values].sort((a, b) => (key(a) < key(b) ? -1 : key(a) > key(b) ? 1 : 0));
 export const publicOperationKey = (atom: string, iface: string, operation: string): string =>

src/execution-world/projections.ts

@@ -1,4 +1,5 @@
-import { ExecutionPlanError, hexDigest, type ExecutionPlan, type PlannedQuery } from "./plan.js";
+import { executionPlanDigest, ExecutionPlanError, type ExecutionPlan, type PlannedQuery } from "./plan.js";
+
 /** Contracts promised by a direct result. Interface dependencies are explicit; accidental
  * overlap among today's implementations does not silently widen an exported interface contract. */
 export function resultInterfaces(plan: ExecutionPlan, operationKey: string): string[] {
@@ -23,7 +24,7 @@ export function resultInterfaces(plan: ExecutionPlan, operationKey: string): str
 }
 /** Compile-time observeResult compatibility. Observation does not grant read or mutation authority. */
 export function checkResultProjection(plan: ExecutionPlan, operationKey: string, queryId: string): PlannedQuery {
-  if (hexDigest(plan.definition) !== plan.digest)
+  if (executionPlanDigest(plan) !== plan.digest)
     throw new ExecutionPlanError("INVALID_PLAN", "projection", "Plan digest mismatch");
   const query = plan.definition.queries.find((q) => q.id === queryId);
   if (!query) throw new ExecutionPlanError("UNKNOWN_PROJECTION", queryId, "No installed query");

src/execution-world/public-reflection.ts

@@ -1,27 +1,17 @@
-import { compileInspectionTemplates } from "./inspection.js";
-import { compileKernelProgram } from "./kernel.js";
-import { hexDigest, type ExecutionPlan } from "./plan.js";
-import { clientContractCatalog, type ExecutionInstallation } from "./installation.js";
+import { compileInspectionTemplates, type InspectionKernel } from "./inspection.js";
+import { hexDigestAsync, type ExecutionPlan } from "./plan.js";
+import type { ClientContractCatalog } from "./installation.js";
 import { publicOperationContract, publicQueryContract } from "./client-contracts.js";
 
-/** Explicit public projection. Never serialize conformance storage or package ports. */
-export function publicDefinitionSnapshot(plan: ExecutionPlan, installation: ExecutionInstallation) {
+/** Explicit public projection of checked inputs. Never serialize conformance
+ * storage or package ports, or recompile a historical Candidate at runtime.
+ * The caller supplies that Candidate's checked, cached public catalog. */
+export async function publicDefinitionSnapshot(
+  plan: ExecutionPlan,
+  kernel: InspectionKernel,
+  catalog: ClientContractCatalog,
+) {
   const workspace = plan.definition.workspace;
-  const kernel = compileKernelProgram(plan) as {
-    operations: {
-      atom: string;
-      interface: string;
-      operation: string;
-      unsupported: string | null;
-      effect: string;
-      targets: string[];
-    }[];
-  };
-  const catalog = clientContractCatalog(
-    plan,
-    installation,
-    installation.packages.map((pkg) => pkg.revision),
-  );
   const rows = {
     atoms: workspace.atoms.map((atom) => ({ id: atom.id, name: atom.displayName, documentation: atom.documentation })),
     interfaces: workspace.interfaceImports.map((iface) => ({
@@ -68,7 +58,7 @@ export function publicDefinitionSnapshot(plan: ExecutionPlan, installation: Exec
       ),
     })),
     queries: [
-      ...compileInspectionTemplates(plan).contracts.map((descriptor) => ({
+      ...compileInspectionTemplates(plan, kernel).contracts.map((descriptor) => ({
         id: JSON.stringify([descriptor.package, descriptor.query]),
         name: "Public inspection",
         package: descriptor.package,
@@ -100,5 +90,5 @@ export function publicDefinitionSnapshot(plan: ExecutionPlan, installation: Exec
     { id: string; [key: string]: unknown }[]
   >;
   for (const entries of Object.values(publicRows)) entries.sort((a, b) => (a.id < b.id ? -1 : a.id > b.id ? 1 : 0));
-  return { codec: "camino-definitions-v1" as const, id: hexDigest(publicRows), rows: publicRows };
+  return { codec: "camino-definitions-v1" as const, id: await hexDigestAsync(publicRows), rows: publicRows };
 }

src/execution-world/queries.ts

@@ -1,9 +1,11 @@
+import { executionPlanDigest, ExecutionPlanError, type ExecutionPlan } from "./plan.js";
 import { compileKernelProgram } from "./kernel.js";
 import { compileInspectionTemplates } from "./inspection.js";
 import { portableValueSchema } from "../bindings/portable.js";
-import { ExecutionPlanError, hexDigest, type ExecutionPlan } from "./plan.js";
+
 import type { ValueType } from "../capability-model/types.js";
 import { compileQueryComposition } from "../query/composition.js";
+import { queryTreeBlueprint } from "./query-trees.js";
 
 const lowerTypes = (value: unknown): unknown =>
   JSON.parse(
@@ -23,7 +25,7 @@ const lowerTypes = (value: unknown): unknown =>
 /** Checked query IR and installed getter identities, without GraphQL schemas/parsers or SQL adapters.
  * Keep authored selection names only for output paths; field access uses resolved interface/member IDs. */
 export function compileQueryProgram(plan: ExecutionPlan): unknown {
-  if (hexDigest(plan.definition) !== plan.digest)
+  if (executionPlanDigest(plan) !== plan.digest)
     throw new ExecutionPlanError("INVALID_PLAN", "queries", "Plan digest mismatch");
   const allQueries = new Map(plan.definition.queries.map(({ id, query }) => [id, query.checked]));
   const compositions = plan.definition.workspace.packageImports.flatMap((pkg) =>
@@ -59,6 +61,12 @@ export function compileQueryProgram(plan: ExecutionPlan): unknown {
     codec: "camino-query-program-v1",
     plan: (compileKernelProgram(plan) as { plan: string }).plan,
     ...(compositions.length ? { compositions } : {}),
+    trees: plan.definition.queries
+      .filter((entry) => entry.query.checked.tree)
+      .map((entry) => ({
+        id: entry.id,
+        ...queryTreeBlueprint(entry.query.packageRevisionId, entry.query.checked),
+      })),
     queries: [
       ...compileInspectionTemplates(plan).queries,
       ...plan.definition.queries.map((entry) => queryProgramEntry(plan, entry)),
@@ -85,7 +93,10 @@ export function queryProgramEntry(plan: ExecutionPlan, entry: import("./plan.js"
     placement: checked.declaration.placement?.kind ?? "remote",
     source:
       checked.declaration.placement?.kind === "local"
-        ? JSON.stringify([query.packageRevisionId, checked.declaration.placement.sourceQueryId])
+        ? JSON.stringify([
+            query.packageRevisionId,
+            checked.treeProjection?.tree ?? checked.declaration.placement.sourceQueryId,
+          ])
         : null,
     root: checked.declaration.root,
     atoms: query.rootAtoms,
@@ -105,6 +116,19 @@ export function queryProgramEntry(plan: ExecutionPlan, entry: import("./plan.js"
         operation: JSON.stringify([field.atomId, field.interfaceRevisionId, field.getter]),
       };
     }),
-    admittedOperations,
+    admittedOperations: checked.tree
+      ? [
+          ...new Set([
+            ...admittedOperations,
+            ...plan.definition.queries
+              .filter(
+                (entry) =>
+                  entry.query.packageRevisionId === query.packageRevisionId &&
+                  entry.query.checked.treeProjection?.tree === checked.declaration.id,
+              )
+              .flatMap((entry) => entry.operations),
+          ]),
+        ].sort()
+      : admittedOperations,
   };
 }

src/execution-world/query-document.ts

@@ -1,8 +1,9 @@
+import { executionPlanDigest, hexDigest, type ExecutionPlan, type PlannedQuery } from "./plan.js";
 import { compileQuery } from "../query/compile.js";
 import { linkQueries } from "../query/link.js";
 import { capabilityId } from "../capability-model/types.js";
 import { portableValueSchema } from "../bindings/portable.js";
-import { hexDigest, type ExecutionPlan, type PlannedQuery } from "./plan.js";
+
 import { compileKernelProgram } from "./kernel.js";
 import { queryProgramEntry } from "./queries.js";
 import { unsupportedQueryOperator } from "./query-operators.js";
@@ -17,7 +18,7 @@ export interface QueryDocument {
 /** Runtime query documents use the same language, nominal contracts, linking
  * and interpreter as packaged queries. They introduce no resources or code. */
 export async function compilePublicQuery(plan: ExecutionPlan, request: QueryDocument) {
-  if (hexDigest(plan.definition) !== plan.digest) throw Error("INVALID_PLAN");
+  if (executionPlanDigest(plan) !== plan.digest) throw Error("INVALID_PLAN");
   if (
     typeof request.document !== "string" ||
     Buffer.byteLength(request.document) > 32768 ||

src/execution-world/query-trees.ts

@@ -0,0 +1,94 @@
+import type { CheckedQuery, QueryTreeNode } from "../query/types.js";
+import type { ValueType } from "../capability-model/types.js";
+import { treeProjectionQuery } from "../query/tree.js";
+import { tsType } from "../bindings/portable.js";
+
+export function queryTreeBlueprint(packageId: string, query: CheckedQuery) {
+  const tree = query.tree!;
+  const projection = (id: string) =>
+    JSON.stringify([packageId, treeProjectionQuery(query.declaration.id, id, "local")]);
+  const admission = (id: string) =>
+    JSON.stringify([packageId, treeProjectionQuery(query.declaration.id, id, "replica")]);
+  return {
+    root: tree.root,
+    maxOccurrences: tree.maxOccurrences,
+    nodes: tree.nodes.map((node) => ({
+      ...node,
+      projection: projection(node.projection),
+      admission: admission(node.projection),
+      bindings: node.bindings.map((binding) => ({
+        ...binding,
+        projection: projection(binding.projection),
+        admission: admission(binding.projection),
+      })),
+    })),
+  };
+}
+
+/** Emit the shape of owned handles separately from graph result codecs. */
+export function queryTreeType(query: CheckedQuery): string {
+  const tree = query.tree!;
+  const nodes = new Map(tree.nodes.map((node) => [node.id, node]));
+  const projections = new Map(tree.projections.map((projection) => [projection.id, projection]));
+  const rootOutput = (id: string) => {
+    const shape = projections.get(id)!.output;
+    if (shape.kind !== "record" || !shape.fields.root) throw Error("Unchecked Query Tree projection");
+    return shape.fields.root;
+  };
+  const shape = (id: string): string => {
+    const node = nodes.get(id)!;
+    return `QueryTreeShape<${tsType(rootOutput(node.projection))}, {${node.boundaries
+      .map(
+        (boundary) =>
+          `readonly ${JSON.stringify(boundary.name)}${boundary.conditions.length ? "?" : ""}: ${shape(boundary.node)}`,
+      )
+      .join(";")}}, {readonly root: {${node.bindings
+      .map(
+        (binding) =>
+          `readonly ${JSON.stringify(binding.name)}: ${bindingType(rootOutput(binding.projection), binding.targets, [binding.name])}`,
+      )
+      .join(";")}}}>`;
+  };
+  const bindingType = (
+    type: ValueType,
+    targets: QueryTreeNode["bindings"][number]["targets"],
+    prefix: string[],
+  ): string => {
+    const at = (type: ValueType, targets: QueryTreeNode["bindings"][number]["targets"]): string => {
+      if (type.kind === "optional") return `(${at(type.value, targets)} | null)`;
+      if (type.kind === "list")
+        return `ReadonlyArray<${at(
+          type.value,
+          targets.map((target) => ({ ...target, path: target.path.slice(1) })),
+        )}>`;
+      const target = targets.find((target) => !target.path.length);
+      if (target) {
+        if (type.kind !== "record" || type.fields._camino?.kind !== "record" || !type.fields._camino.fields.ref)
+          throw Error("Unchecked binding identity");
+        return `QueryTreeOccurrence<${tsType(type.fields._camino.fields.ref)}, ${shape(target.node)}>`;
+      }
+      if (type.kind !== "record") return tsType(type);
+      return `{${Object.entries(type.fields)
+        .map(
+          ([key, value]) =>
+            `readonly ${JSON.stringify(key)}: ${at(
+              value,
+              targets
+                .filter((target) => target.path[0] === key)
+                .map((target) => ({ ...target, path: target.path.slice(1) })),
+            )}`,
+        )
+        .join(";")}}`;
+    };
+    let selected = type;
+    for (const key of prefix) {
+      if (selected.kind !== "record" || !selected.fields[key]) throw Error("Unchecked binding field");
+      selected = selected.fields[key];
+    }
+    return at(
+      selected,
+      targets.map((target) => ({ ...target, path: target.path.slice(prefix.length) })),
+    );
+  };
+  return shape(tree.root);
+}

src/query/compile.ts

@@ -41,6 +41,7 @@ import { objectRow } from "./relational-schema.js";
 import { workspaceQueryRootId } from "./root.js";
 import { relationalCompiler } from "./relational-compile.js";
 import { fragmentSources, type FragmentResolver } from "./fragments.js";
+import { lowerQueryTree, stripQueryBoundaries } from "./tree.js";
 import {
   QueryCompileError,
   type QueryDeclaration,
@@ -158,7 +159,7 @@ export async function compileQuery(
       if (node.name.value.startsWith("__")) fail("QUERY_UNSUPPORTED_FEATURE", "Introspection is not supported", node);
     },
     Directive(node) {
-      if (!["include", "skip"].includes(node.name.value))
+      if (!["include", "skip", "boundary"].includes(node.name.value))
         fail("QUERY_UNSUPPORTED_FEATURE", `Unsupported directive ${node.name.value}`, node);
     },
   });
@@ -421,6 +422,7 @@ export async function compileQuery(
         for (const selection of set.selections) {
           if (++expandedFields > 10000) fail("QUERY_WORK_LIMIT", "Expanded query exceeds 10000 fields", selection);
           if (selection.kind === "FragmentSpread") {
+            if (selection.directives?.some((directive) => directive.name.value === "boundary")) continue;
             if (fragmentContracts.get(selection.name.value)?.mode === "reference") continue;
             add(
               fragments.get(selection.name.value)!.selectionSet,
@@ -519,7 +521,7 @@ export async function compileQuery(
   };
   const conditions = (directives: readonly DirectiveNode[] = []) =>
     directives
-      .filter((directive) => directive.name.value !== "live")
+      .filter((directive) => ["include", "skip"].includes(directive.name.value))
       .map((directive) => ({
         include: directive.name.value === "include",
         value: argument(directive.arguments!.find((entry) => entry.name.value === "if")!.value),
@@ -540,6 +542,52 @@ export async function compileQuery(
         const contract = fragmentContracts.get(node.name.value);
         if (contract && generated.byName.get(parent.name)?.revisionId !== contract.root)
           fail("FRAGMENT_ROOT_MISMATCH", "Imported fragment requires its exact nominal root interface", node);
+        const directive = node.directives?.find((directive) => directive.name.value === "boundary");
+        if (directive) {
+          const name = directive.arguments?.find((argument) => argument.name.value === "name")?.value;
+          if (name?.kind !== "StringValue" || !/^[A-Za-z_][A-Za-z0-9_]{0,63}$/.test(name.value))
+            return fail(
+              "QUERY_BOUNDARY_NAME",
+              "A boundary needs a literal identifier of at most 64 characters",
+              directive,
+            );
+          const root = generated.byName.get(parent.name)?.revisionId;
+          if (!root || root === workspaceQueryRootId)
+            return fail("QUERY_BOUNDARY_ROOT", "A boundary must select a nominal Graph Object", node);
+          if (contract?.mode === "reference")
+            fail("QUERY_BOUNDARY_REFERENCE", "Use an ordinary checked Fragment spread for a boundary", node);
+          const fragment = fragments.get(node.name.value)!;
+          const token = node.loc?.startToken;
+          return [
+            {
+              name: "$boundary",
+              key: "",
+              arguments: {},
+              conditions: inheritedConditions,
+              boundary: {
+                name: name.value,
+                root,
+                output: required(parent, fragment.selectionSet),
+                ...(token ? { location: { file: node.loc!.source.name, line: token.line, column: token.column } } : {}),
+              },
+              selection: [
+                ...(contract
+                  ? [
+                      {
+                        name: "$fragment",
+                        key: "",
+                        selection: [],
+                        arguments: {},
+                        conditions: [],
+                        fragmentSpread: contract,
+                      },
+                    ]
+                  : []),
+                ...selection(fragment.selectionSet, parent),
+              ],
+            },
+          ];
+        }
         return [
           ...(contract
             ? [
@@ -598,6 +646,13 @@ export async function compileQuery(
       ];
     });
     const contract = generated.byName.get(parent.name);
+    const names = new Set<string>();
+    for (const field of selections)
+      if (field.boundary) {
+        if (names.has(field.boundary.name))
+          fail("QUERY_BOUNDARY_DUPLICATE", `Duplicate boundary ${field.boundary.name}`);
+        names.add(field.boundary.name);
+      }
     if (!contract || contract.revisionId === workspaceQueryRootId) return selections;
     // Fragment expansion may repeat metadata. Combine its children so a later
     // implicit reference cannot overwrite an explicitly selected aggregate.
@@ -632,10 +687,11 @@ export async function compileQuery(
   const normalized = print(document),
     schema = printSchema(generated.schema);
   const selections = selection(operations[0]!.selectionSet, generated.schema.getQueryType()!);
+  const tree = lowerQueryTree(declaration, selections, result);
   const definitionDigest = createHash("sha256")
     .update(
       canonicalJson({
-        semantics: 6,
+        semantics: tree ? 7 : 6,
         declaration,
         normalized,
         fragmentContracts: Object.fromEntries(fragmentContracts),
@@ -667,7 +723,8 @@ export async function compileQuery(
     variables: { kind: "record", fields: variables },
     output: result,
     effects: [...effects.values()],
-    selection: selections,
+    selection: tree ? stripQueryBoundaries(selections) : selections,
+    ...(tree ? { tree } : {}),
     variableDefaults: Object.fromEntries(
       (operations[0]!.variableDefinitions ?? [])
         .filter((entry) => entry.defaultValue)

src/query/schema.ts

@@ -11,6 +11,8 @@ import {
   GraphQLList,
   GraphQLNonNull,
   GraphQLSchema,
+  GraphQLDirective,
+  DirectiveLocation,
   specifiedDirectives,
   visit,
   type GraphQLOutputType,
@@ -294,7 +296,14 @@ export function querySchema(
     return result;
   };
   const schema = new GraphQLSchema({
-    directives: specifiedDirectives,
+    directives: [
+      ...specifiedDirectives,
+      new GraphQLDirective({
+        name: "boundary",
+        locations: [DirectiveLocation.FRAGMENT_SPREAD],
+        args: { name: { type: new GraphQLNonNull(GraphQLString) } },
+      }),
+    ],
     // Nominal projections can mention an interface not reached by a relation.
     types: (() => {
       const requested = new Set<string>();

src/query/tree.ts

@@ -0,0 +1,282 @@
+import { valueType, type InterfaceRevisionId, type ValueType } from "../capability-model/types.js";
+import {
+  QueryCompileError,
+  type QueryDeclaration,
+  type QuerySelection,
+  type QueryTreePlan,
+  type QueryTreeNode,
+} from "./types.js";
+import type { CheckedQuery } from "./types.js";
+import { createHash } from "node:crypto";
+import { canonicalJson } from "../capability-model/evolution.js";
+
+export const stripQueryBoundaries = (fields: readonly QuerySelection[]): QuerySelection[] =>
+  fields
+    .filter((field) => !field.boundary)
+    .map((field) => ({ ...field, selection: stripQueryBoundaries(field.selection) }));
+
+const containsBoundary = (fields: readonly QuerySelection[]): boolean =>
+  fields.some((field) => !!field.boundary || containsBoundary(field.selection));
+
+/** GraphQL repeated paths form one projection. Equivalent checked selections
+ * reuse their binding; differing windows/guards never silently share it. */
+function mergeTreeFields(fields: readonly QuerySelection[]): QuerySelection[] {
+  const result: QuerySelection[] = [];
+  for (const input of fields) {
+    const field = { ...input, selection: mergeTreeFields(input.selection) };
+    const previous = result.find(
+      (candidate) =>
+        !candidate.boundary &&
+        !field.boundary &&
+        !candidate.fragmentSpread &&
+        !field.fragmentSpread &&
+        candidate.key === field.key,
+    );
+    if (!previous) {
+      result.push(field);
+      continue;
+    }
+    const { selection: _left, ...left } = previous;
+    const { selection: _right, ...right } = field;
+    if (canonicalJson(left) !== canonicalJson(right)) {
+      if (containsBoundary(previous.selection) || containsBoundary(field.selection))
+        throw new QueryCompileError(
+          "QUERY_TREE_BINDING_CONFLICT",
+          `Alias differently guarded or parameterized paths selected as ${field.key}`,
+        );
+      result.push(field);
+      continue;
+    }
+    previous.selection = mergeTreeFields([...previous.selection, ...field.selection]);
+  }
+  const names = new Set<string>();
+  for (const field of result)
+    if (field.boundary) {
+      if (names.has(field.boundary.name))
+        throw new QueryCompileError("QUERY_BOUNDARY_DUPLICATE", `Duplicate boundary ${field.boundary.name}`);
+      names.add(field.boundary.name);
+    }
+  return result;
+}
+const required = (type: ValueType): ValueType =>
+  type.kind === "optional" || type.kind === "list" ? required(type.value) : type;
+const fieldType = (type: ValueType, key: string): ValueType => {
+  const shape = required(type);
+  if (shape.kind !== "record" || !shape.fields[key])
+    throw new QueryCompileError("QUERY_TREE_SHAPE", `Missing checked field ${key}`);
+  return shape.fields[key];
+};
+const objectInterface = (fields: readonly QuerySelection[]): InterfaceRevisionId | undefined =>
+  fields
+    .find((field) => field.name === "_camino" && field.key === "_camino")
+    ?.selection.find((field) => field.name === "ref")?.targetInterfaceRevisionId;
+const identity = (fields: readonly QuerySelection[]): QuerySelection[] =>
+  fields
+    .filter((field) => field.name === "_camino" && field.key === "_camino")
+    .map((field) => ({ ...field, conditions: [], selection: field.selection.filter((child) => child.name === "ref") }));
+function projectionType(type: ValueType, fields: readonly QuerySelection[]): ValueType {
+  if (type.kind === "optional") return valueType.optional(projectionType(type.value, fields));
+  if (type.kind === "list") return valueType.list(projectionType(type.value, fields));
+  if (type.kind !== "record") return type;
+  return {
+    kind: "record",
+    fields: Object.fromEntries(
+      fields
+        .filter((field) => !field.fragmentSpread)
+        .map((field) => {
+          const source = type.fields[field.key] ?? (field.key === "key" ? valueType.string : undefined);
+          if (!source) throw new QueryCompileError("QUERY_TREE_SHAPE", `Missing checked projection ${field.key}`);
+          return [field.key, projectionType(source, field.selection)];
+        }),
+    ),
+  };
+}
+const keyField = (): QuerySelection => ({ name: "key", key: "key", conditions: [], arguments: {}, selection: [] });
+
+/** Lower into complete projections and minimal binding projections. No runtime
+ * component inspection, executable client source, or graph handle value is involved.
+ * Each projection is rooted at its own nominal subject; lists retain entry keys.
+ */
+export function lowerQueryTree(
+  declaration: QueryDeclaration,
+  selection: QuerySelection[],
+  output: ValueType,
+): QueryTreePlan | undefined {
+  if (!containsBoundary(selection)) return;
+  selection = mergeTreeFields(selection);
+  if (declaration.placement?.kind !== "replica" || declaration.fragment)
+    throw new QueryCompileError(
+      "QUERY_TREE_PLACEMENT",
+      "Declare a Query Tree as a replica query; its checked projections supply local views",
+    );
+  const root = selection.find((field) => field.name === "root" && field.key === "root");
+  if (!root || selection.some((field) => field !== root))
+    throw new QueryCompileError("QUERY_TREE_ROOT", "A Query Tree requires one unaliased root selection");
+  const plan: QueryTreePlan = { root: "root", nodes: [], projections: [], maxOccurrences: 0 };
+  const collectionBound = (field: QuerySelection): number | undefined => {
+    const limit = field.arguments.first ?? field.arguments.all;
+    // Checked GraphQL Int literals retain their decimal spelling in the IR.
+    if (limit?.kind !== "literal" || !["string", "number"].includes(typeof limit.value)) return;
+    const value = Number(limit.value);
+    return Number.isSafeInteger(value) && value > 0 ? Math.min(value, declaration.budgets.rows) : undefined;
+  };
+  const project = (id: string, subject: InterfaceRevisionId, fields: QuerySelection[], shape: ValueType) => {
+    if (plan.projections.length >= 256)
+      throw new QueryCompileError("QUERY_TREE_LIMIT", "Query Tree exceeds 256 projections");
+    plan.projections.push({
+      id,
+      root: id === "root/value" ? declaration.root : { kind: "object", interface: subject },
+      selection: [{ name: "root", key: "root", arguments: {}, conditions: [], selection: fields }],
+      output: { kind: "record", fields: { root: shape } },
+    });
+    return id;
+  };
+  const node = (
+    id: string,
+    subject: InterfaceRevisionId,
+    fields: QuerySelection[],
+    shape: ValueType,
+    occurrences: number,
+  ): string => {
+    plan.maxOccurrences += occurrences;
+    if (!Number.isSafeInteger(plan.maxOccurrences) || plan.maxOccurrences > 256)
+      throw new QueryCompileError("QUERY_TREE_LIMIT", "Query Tree exceeds 256 bounded node occurrences");
+    const current: QueryTreeNode = {
+      id,
+      projection: project(id + "/value", subject, stripQueryBoundaries(fields), shape),
+      boundaries: [],
+      bindings: [],
+    };
+    plan.nodes.push(current);
+    for (const field of fields)
+      if (field.boundary) {
+        const child = field.boundary;
+        current.boundaries.push({
+          name: child.name,
+          conditions: field.conditions,
+          node: node(id + "/boundary/" + child.name, child.root, field.selection, child.output, occurrences),
+        });
+      }
+    for (const field of fields) {
+      if (field.boundary || !containsBoundary(field.selection)) continue;
+      const targets: { path: string[]; node: string }[] = [];
+      const prune = (
+        fields: QuerySelection[],
+        shape: ValueType,
+        path: string[],
+        bound: number,
+        listLimit = declaration.budgets.rows,
+      ): QuerySelection[] => {
+        if (shape.kind === "optional") return prune(fields, shape.value, path, bound, listLimit);
+        if (shape.kind === "list") return prune(fields, shape.value, [...path, "[]"], bound * listLimit);
+        const target = objectInterface(fields);
+        if (target) {
+          targets.push({
+            path,
+            node: node(id + "/binding/" + path.map(encodeURIComponent).join("/"), target, fields, shape, bound),
+          });
+          return identity(fields);
+        }
+        const minimal = fields
+          .filter((field) => containsBoundary(field.selection))
+          .map((field) => ({
+            ...field,
+            selection: prune(
+              field.selection,
+              fieldType(shape, field.key),
+              [...path, field.key],
+              bound,
+              collectionBound(field) ?? listLimit,
+            ),
+          }));
+        // Relationship occurrence identity is its entry key, including duplicate
+        // target Objects. Never substitute list position or Object identity.
+        if (minimal.some((field) => field.name === "node") && !minimal.some((field) => field.name === "key"))
+          minimal.unshift(fields.find((field) => field.name === "key" && field.key === "key") ?? keyField());
+        return minimal;
+      };
+      const type = fieldType(shape, field.key);
+      const minimal = {
+        ...field,
+        selection: prune(field.selection, type, [field.key], occurrences, collectionBound(field)),
+      };
+      const selected = [...identity(fields), minimal];
+      current.bindings.push({
+        name: field.key,
+        targets,
+        projection: project(
+          id + "/bindings/" + encodeURIComponent(field.key),
+          subject,
+          selected,
+          projectionType(shape, selected),
+        ),
+      });
+    }
+    return id;
+  };
+  node("root", declaration.root.interface, root.selection, fieldType(output, "root"), 1);
+  return plan;
+}
+
+export const treeProjectionQuery = (tree: string, projection: string, role: "replica" | "local") =>
+  `${tree}/@tree/${projection}/${role}`;
+
+/** Checked synthetic queries remain ordinary nominal queries for linking,
+ * authority, native input acquisition and execution. Public trees own the plan;
+ * applications do not copy these projections into their source declarations. */
+export function queryTreeProjections(query: CheckedQuery): CheckedQuery[] {
+  if (!query.tree) return [];
+  const { tree: _tree, ...base } = query;
+  return query.tree.projections.flatMap((projection) => {
+    const selected = new Set<string>();
+    const walk = (fields: readonly QuerySelection[]) => {
+      for (const field of fields) {
+        if (field.interfaceRevisionId && field.memberId)
+          selected.add(JSON.stringify([field.interfaceRevisionId, field.memberId]));
+        walk(field.selection);
+      }
+    };
+    walk(projection.selection);
+    const effects = query.effects.filter(
+      (effect) =>
+        selected.has(JSON.stringify([effect.interfaceRevisionId, effect.memberId])) ||
+        effect.uses.some((use) => use !== "select"),
+    );
+    if (effects.some((effect) => effect.execution === "rpc-permitted"))
+      throw new QueryCompileError(
+        "QUERY_TREE_LOCAL_DEPENDENCY",
+        "A replica Query Tree requires locally executable snapshot projections",
+      );
+    return (["replica", "local"] as const).map((role): CheckedQuery => {
+      const id = treeProjectionQuery(query.declaration.id, projection.id, role);
+      const declaration: QueryDeclaration = {
+        ...query.declaration,
+        id,
+        displayName: id,
+        root: projection.root,
+        placement:
+          role === "replica"
+            ? { kind: "replica" }
+            : { kind: "local", sourceQueryId: treeProjectionQuery(query.declaration.id, projection.id, "replica") },
+      };
+      return {
+        ...base,
+        declaration,
+        effects,
+        selection: projection.selection,
+        output: projection.output,
+        treeProjection: { tree: query.declaration.id, projection: projection.id, role },
+        definitionDigest: createHash("sha256")
+          .update(
+            canonicalJson({
+              parent: query.definitionDigest,
+              declaration,
+              selection: projection.selection,
+              output: projection.output,
+            }),
+          )
+          .digest("hex"),
+      };
+    });
+  });
+}

src/query/types.ts

@@ -94,6 +94,9 @@ export class QueryCompileError extends Error {
   }
 }
 export interface CheckedQuery {
+  /** Checked decomposition; handles belong to a Client Session, never graph values. */
+  tree?: QueryTreePlan;
+  treeProjection?: { tree: string; projection: string; role: "replica" | "local" };
   fragmentContracts?: Record<string, NonNullable<QuerySelection["fragmentSpread"]>>;
   declaration: QueryDeclaration;
   definitionDigest: string;
@@ -115,6 +118,12 @@ export type QueryArgument =
   | { kind: "list"; values: QueryArgument[] }
   | { kind: "object"; fields: Record<string, QueryArgument> };
 export interface QuerySelection {
+  boundary?: {
+    name: string;
+    root: InterfaceRevisionId;
+    output: ValueType;
+    location?: QuerySourceLocation;
+  };
   /** A checked occurrence marker, not an output field or storage capability. */
   fragmentSpread?: {
     mode?: "reference";
@@ -135,3 +144,27 @@ export interface QuerySelection {
   relational?: import("./relational.js").QueryRelationalPlan;
   predicate?: import("./relational.js").QueryPredicate;
 }
+
+export interface QueryTreeProjection {
+  id: string;
+  root: QueryRoot;
+  selection: QuerySelection[];
+  output: ValueType;
+}
+export interface QueryTreeNode {
+  id: string;
+  projection: string;
+  boundaries: { name: string; conditions: QuerySelection["conditions"]; node: string }[];
+  bindings: {
+    name: string;
+    projection: string;
+    /** [] denotes an occurrence in a bounded list; its entry key owns identity. */
+    targets: { path: string[]; node: string }[];
+  }[];
+}
+export interface QueryTreePlan {
+  root: string;
+  nodes: QueryTreeNode[];
+  projections: QueryTreeProjection[];
+  maxOccurrences: number;
+}

src/react-build/declarations.ts

@@ -20,6 +20,9 @@ export interface ReactModulePreparation {
   /** Public input type before workspace query lowering adds private projections. */
   input?: ValueType;
   children: ReactChildDeclaration[];
+  /** Binds roots/arguments only. The ordinary checked Query Tree owns every
+   * acquisition path; the React declaration does not repeat its descendants. */
+  trees?: Pick<QueryCompositionStep, "name" | "query" | "root" | "arguments">[];
 }
 export interface ReactPreparationArtifact {
   /** Frontend queries belong to installed preparation, not the authored client API. */
@@ -51,7 +54,7 @@ export function presentationDeclarations(
   };
   for (const [name, value] of Object.entries(modules)) {
     const declaration = object(value, `module ${name}`);
-    if (Object.keys(declaration).some((key) => !["inputs", "children"].includes(key)))
+    if (Object.keys(declaration).some((key) => !["inputs", "children", "trees"].includes(key)))
       throw Error(`${name}: unknown preparation field`);
     const module = pkg.modules?.find((entry) => entry.displayName === name);
     if (!module) throw Error(`React declaration: unknown module ${name}`);
@@ -129,7 +132,29 @@ export function presentationDeclarations(
         ...(role ? { role } : {}),
       };
     });
-    artifact.modules.push({ module: module.id, composition, children: parsed });
+    const trees = declaration.trees ?? [];
+    if (!Array.isArray(trees) || trees.length > 16) throw Error(`${name}: trees must be a bounded array`);
+    const treeNames = new Set<string>();
+    const preparedTrees = trees.map((value) => {
+      const tree = object(value, `${name} tree`) as unknown as NonNullable<ReactModulePreparation["trees"]>[number];
+      if (
+        Object.keys(tree).some((key) => !["name", "query", "root", "arguments"].includes(key)) ||
+        !/^[A-Za-z_][A-Za-z0-9_]*$/.test(tree.name) ||
+        treeNames.has(tree.name)
+      )
+        throw Error(`${name}: tree requires a unique name and checked root/arguments`);
+      treeNames.add(tree.name);
+      const query = pkg.queries?.find((entry) => entry.displayName === tree.query);
+      if (!query || query.placement?.kind !== "replica")
+        throw Error(`${name}.${tree.name}: requires a replica Query Tree`);
+      return { ...tree, query: query.id };
+    });
+    artifact.modules.push({
+      module: module.id,
+      composition,
+      children: parsed,
+      ...(preparedTrees.length ? { trees: preparedTrees } : {}),
+    });
   }
   for (const module of pkg.modules ?? []) {
     const contract = interfaces.find((entry) => entry.revisionId === module.interfaceRevisionId);

src/react-build/expansion.ts

@@ -364,6 +364,9 @@ export async function expandPresentationQueries(workspace: WorkspaceRevision): P
   for (const pkg of workspace.packageImports) {
     for (const original of [...(pkg.checkedQueries ?? [])]) {
       if (!original.declaration.id.startsWith("presentation:navigation:")) continue;
+      // Identity must remain independent of every occurrence's data projection.
+      // Full retained acquisition may include those requirements together.
+      if (/:identity-(inputs|view)$/.test(original.declaration.id)) continue;
       const inputs = (stateInputs.get(original.declaration.root.interface) ?? []).map((input) => ({
         ...input,
         query:

src/react-build/workspace.ts

@@ -1,7 +1,7 @@
 import type { WorkspaceRevision, ValueType } from "../capability-model/types.js";
 import { moduleContract } from "../capability-model/modules.js";
 import { canonicalJson } from "../capability-model/evolution.js";
-import { queryBindingType } from "../query/composition.js";
+import { queryBindingType, compileQueryComposition } from "../query/composition.js";
 import { moduleTypeContext } from "../execution-world/module-contracts.js";
 import { preparationArtifact, type ReactPreparationArtifact } from "./declarations.js";
 import { expandPresentationQueries } from "./expansion.js";
@@ -25,6 +25,17 @@ export async function completeWorkspace(workspace: WorkspaceRevision): Promise<v
     if (!composition || composition.output.kind !== "record")
       throw Error(`Missing checked inputs for ${parent.module.displayName}`);
     parent.preparation.input = structuredClone(composition.output);
+    const treeQueries = new Map((parent.pkg.checkedQueries ?? []).map((query) => [query.declaration.id, query]));
+    for (const tree of parent.preparation.trees ?? []) {
+      if (!treeQueries.get(tree.query)?.tree)
+        throw Error(`${parent.module.displayName}.${tree.name}: expected a checked Query Tree`);
+      // Reuse Camino's ordinary nominal/argument binder. Only input parameters
+      // are available; a tree cannot wait on a whole presentation result.
+      compileQueryComposition(
+        { id: `react:tree:${parent.module.id}:${tree.name}`, input: composition.input, steps: [tree], maxQueries: 1 },
+        treeQueries,
+      );
+    }
     const outputs = new Map(Object.entries(composition.output.fields));
     const dependencies: string[] = [];
     const children = parent.preparation.children.map((child) => {

src/resource-lock/cli.ts

@@ -1,5 +1,20 @@
 #!/usr/bin/env node
 import { loadQuixosLock } from "./loader.js";
+import { parseQuixosLockDocument } from "./parser.js";
+import { readFile, stat } from "node:fs/promises";
+
+// A trusted fetcher can inspect the root's declared platform pin without
+// following authored import paths or evaluating Nix. The input is a fetched
+// Git blob, not a filesystem tree provided by an author.
+if (process.argv[2] === "--platform-only") {
+  const filename = process.argv[3];
+  if (process.argv.length !== 4 || !filename || (await stat(filename)).size > 1024 * 1024)
+    throw Error("INVALID_PLATFORM_SOURCE_LOCK");
+  const result = parseQuixosLockDocument(await readFile(filename, "utf8"));
+  if (!result.ok || result.document.kind !== "root") throw Error("INVALID_PLATFORM_SOURCE_LOCK");
+  console.log(JSON.stringify({ repository: result.document.quixos.repository, commit: result.document.quixos.commit }));
+  process.exit(0);
+}
 
 const fileName = process.argv[2];
 if (!fileName || process.argv.length !== 3) {

src/resource-lock/loader.ts

@@ -118,6 +118,9 @@ export const loadQuixosLock = async (fileName: string): Promise<QuixosLockParseR
   const absoluteRoot = path.resolve(fileName);
   const repositoryRoot = path.dirname(absoluteRoot);
   const rootName = path.basename(absoluteRoot);
+  const metadata = await lstat(absoluteRoot);
+  if (!metadata.isFile() || metadata.isSymbolicLink())
+    throw new Error("root locks must be ordinary files, not symbolic links");
   const rootSource = await readFile(absoluteRoot, "utf8");
   return await resolveQuixosLock(
     rootSource,

test/candidate-metadata.test.ts

@@ -4,6 +4,65 @@ import { mkdtemp, writeFile, symlink, rm } from "node:fs/promises";
 import { join } from "node:path";
 import { tmpdir } from "node:os";
 import { CandidateMetadataBudget, readCandidateMetadata } from "../src/execution-world/metadata.js";
+import { loadCheckedInstallationCandidate } from "../src/execution-world/candidate.js";
+import { hexDigestAsync } from "../src/execution-world/plan.js";
+
+test(
+  "a real checked application can stage its replacement within the default metadata budget",
+  {
+    skip: !process.env.QX_CHECKED_CANDIDATE,
+  },
+  async () => {
+    const root = process.env.QX_CHECKED_CANDIDATE!;
+    const budget = new CandidateMetadataBudget();
+    const first = await loadCheckedInstallationCandidate(root, {}, { budget, owner: "reader" });
+    try {
+      const retained = budget.snapshot().bytes;
+      const second = await loadCheckedInstallationCandidate(root, {}, { budget, owner: "reader" });
+      try {
+        assert.equal(budget.snapshot().bytes, retained * 2);
+        assert.deepEqual(second.reference, first.reference, "Compaction preserves exact checked identity");
+        assert.equal(first.world, await hexDigestAsync(first.graphExecution));
+        assert.equal(second.world, first.world, "Replacement retains the checked execution identity");
+        assert.equal(second.graphExecution.kernel, second.kernel, "Graph representation shares the validated program");
+        assert.equal(second.graphExecution.queries, second.queries);
+        // A deliberately tighter pool admits the serving installation but must
+        // reject replacement parsing without leaking a candidate or tree lease.
+        const tight = new CandidateMetadataBudget({
+          bytes: retained + 1,
+          ownerBytes: retained + 1,
+          candidates: 2,
+        });
+        const blocker = tight.acquire("reader");
+        blocker.charge(retained);
+        try {
+          await assert.rejects(
+            loadCheckedInstallationCandidate(root, {}, { budget: tight, owner: "reader" }),
+            /CANDIDATE_METADATA_LIMIT/,
+          );
+          assert.equal(tight.snapshot().bytes, retained);
+          assert.equal(tight.snapshot().candidates, 1);
+        } finally {
+          blocker.release();
+        }
+        const other = budget.acquire("other");
+        try {
+          assert.throws(() => other.charge(budget.limits.bytes), /CANDIDATE_METADATA_LIMIT/);
+          assert.equal(budget.snapshot().bytes, retained * 2, "Rejected admission must not leak charges");
+        } finally {
+          other.release();
+        }
+      } finally {
+        second.metadata.release();
+      }
+      assert.equal(budget.snapshot().bytes, retained, "The serving candidate survives failed or completed staging");
+    } finally {
+      first.metadata.release();
+    }
+    assert.equal(budget.snapshot().bytes, 0);
+    assert.equal(budget.snapshot().candidates, 0);
+  },
+);
 
 test("concurrent candidate reservations enforce aggregate and owner limits and release exactly once", () => {
   const budget = new CandidateMetadataBudget({ bytes: 1000, ownerBytes: 600, candidates: 3 });

test/capability-assembly.test.ts

@@ -90,6 +90,28 @@ package Runtime id "package:runtime" revision "package:runtime@1" {
   );
   assert.equal(result.directResources.size, 1);
 
+  const resolveResource = async (source: { repository: string; commit: string }, kind: string) => ({
+    directory: directories.get(`${kind}\0${source.repository}\0${source.commit}`)!,
+  });
+  const bound = await Promise.all(
+    ["workspace:first", "workspace:second"].map((workspaceId) =>
+      compileWorkspaceRepository({
+        rootDirectory: root,
+        resolveResource,
+        workspaceId,
+        sourceRootCommit: "5".repeat(40),
+      }),
+    ),
+  );
+  assert.notEqual(bound[0]!.workspace.workspaceId, bound[1]!.workspace.workspaceId);
+  assert.notEqual(bound[0]!.workspace.id, bound[1]!.workspace.id);
+  for (const instance of bound) {
+    assert.equal(instance.workspace.sourceRootCommit, "5".repeat(40));
+    assert.deepEqual(instance.workspace.packageImports, result.workspace.packageImports);
+    assert.deepEqual(instance.workspace.interfaceImports, result.workspace.interfaceImports);
+    assert.deepEqual(instance.resources, result.resources, "binding does not fork resource identities");
+  }
+
   const resource = await compileCapabilityResourceRepository({
     rootDirectory: runtime,
     kind: "package",

test/emit-portable-reader.ts

@@ -179,3 +179,11 @@ await writeFile(
   "dist/portable-reader/variants/entries.ts",
   "export type Entries = " + tsType(entries.valueType) + ";\n",
 );
+
+const { queryTreeFixture } = await import("./query-tree-fixture.js");
+const { generatePackageQueryClientBindings } = await import("../src/execution-world/client-contracts.js");
+const treeFixture = await queryTreeFixture();
+await mkdir("dist/portable-reader/query-tree", { recursive: true });
+await writeFile("dist/portable-reader/query-tree/queries.ts", generatePackageQueryClientBindings(treeFixture.pkg));
+await writeFile("dist/portable-reader/query-tree/queries.json", JSON.stringify(compileQueryProgram(treeFixture.plan)));
+await writeFile("dist/portable-reader/query-tree/kernel.json", JSON.stringify(compileKernelProgram(treeFixture.plan)));

test/evolution.test.ts

@@ -3,6 +3,7 @@ import { test } from "node:test";
 import { capabilityId as id, valueType, validateWorkspaceRevision } from "../src/capability-model/index.js";
 import {
   contentDigest,
+  contentDigestAsync,
   planEvolution,
   reviewSemanticMajors,
   runtimeContracts,
@@ -51,6 +52,39 @@ test("hashing is canonical and rejects values outside the persisted JSON contrac
   assert.throws(() => contentDigest(new Date()));
 });
 
+test("cooperative hashing preserves canonical identities and services the event loop", async () => {
+  const sparse = [1, 2, 3];
+  delete sparse[1];
+  const values: unknown[] = [
+    null,
+    false,
+    -0,
+    "中\\n\ud800",
+    sparse,
+    { z: 1, a: { omitted: undefined, b: [false, 1e100] } },
+  ];
+  const shared = { text: "中😀".repeat(22000) };
+  values.push({ first: shared, second: shared });
+  for (const value of values) assert.equal(await contentDigestAsync(value), contentDigest(value));
+  for (const value of [undefined, NaN, Infinity, new Date(), [undefined]])
+    await assert.rejects(contentDigestAsync(value));
+  const cyclic: { next?: unknown } = {};
+  cyclic.next = cyclic;
+  await assert.rejects(contentDigestAsync(cyclic), /cyclic JSON/);
+  const large = Array.from({ length: 50000 }, (_, index) => ({ z: "definition".repeat(8), a: index }));
+  const expected = contentDigest(large);
+  let serviced = false;
+  const timer = setTimeout(() => {
+    serviced = true;
+  }, 0);
+  try {
+    assert.equal(await contentDigestAsync(large), expected);
+    assert.equal(serviced, true, "large verification must let host renewals and RPCs run");
+  } finally {
+    clearTimeout(timer);
+  }
+});
+
 test("a workspace root change and display names do not restart package runtimes", () => {
   const before = makeValidCapabilityWorkspace();
   const after = structuredClone(before);

test/execution-groups.test.ts

@@ -45,7 +45,7 @@ const prepare = async (workspace: WorkspaceRevision) => {
 test("execution reuse ignores world/source/display changes and unrelated packages", async () => {
   const workspace = await loadReaderWorkspace(),
     original = await prepare(workspace);
-  const before = original.groups()[0]!.executionDigest;
+  const before = (await original.groups())[0]!.executionDigest;
   workspace.sourceRootCommit = "f".repeat(40);
   workspace.packageImports[0]!.displayName = "Renamed";
   workspace.packageImports[0]!.source.commit = "e".repeat(40);
@@ -59,13 +59,13 @@ test("execution reuse ignores world/source/display changes and unrelated package
   const after = await prepare(workspace);
   assert.notEqual(after.plan.digest, original.plan.digest);
   assert.equal(
-    after.groups().find((g) => g.logicalId === workspace.packageImports[0]!.packageId)!.executionDigest,
+    (await after.groups()).find((g) => g.logicalId === workspace.packageImports[0]!.packageId)!.executionDigest,
     before,
   );
   original.environments[workspace.packageImports[0]!.revisionId]!.credentialGeneration = "config:2";
-  assert.notEqual(original.groups()[0]!.executionDigest, before);
+  assert.notEqual((await original.groups())[0]!.executionDigest, before);
   original.environments[workspace.packageImports[0]!.revisionId]!.placement = "module";
-  assert.notEqual(original.groups()[0]!.executionDigest, before);
+  assert.notEqual((await original.groups())[0]!.executionDigest, before);
 });
 
 test("outbound provider changes invalidate consumers while caller changes preserve providers", async () => {
@@ -108,15 +108,15 @@ test("outbound provider changes invalidate consumers while caller changes preser
     dependencies: [{ portId, binding: { kind: "state", slotId: id.slot("slot:document:content") } }],
   };
   const prepared = await prepare(workspace);
-  const values = () => new Map(prepared.groups().map((g) => [g.logicalId, g.executionDigest]));
-  const before = values();
+  const values = async () => new Map((await prepared.groups()).map((g) => [g.logicalId, g.executionDigest]));
+  const before = await values();
   prepared.installation.packages.find((p) => p.revision === "package:reader-runtime@1")!.service!.contentDigest =
     "c".repeat(64);
-  const callerChanged = values();
+  const callerChanged = await values();
   assert.equal(callerChanged.get("provider"), before.get("provider"));
   assert.notEqual(callerChanged.get("package:reader-runtime"), before.get("package:reader-runtime"));
   prepared.installation.packages.find((p) => p.revision === revision)!.service!.contentDigest = "d".repeat(64);
-  const providerChanged = values();
+  const providerChanged = await values();
   assert.notEqual(providerChanged.get("provider"), callerChanged.get("provider"));
   assert.notEqual(providerChanged.get("package:reader-runtime"), callerChanged.get("package:reader-runtime"));
 });

test/execution-world.test.ts

@@ -7,7 +7,11 @@ import {
   checkExecutionWorld,
   checkedWorldDigest,
   implementationDigest,
+  clientContractCatalog,
   hexDigest,
+  executionPlanDigest,
+  executionPlanDigestAsync,
+  sealExecutionPlan,
   parsePackageArtifacts,
   artifactPath,
   type PackageArtifacts,
@@ -20,6 +24,54 @@ import { compileKernelProgram } from "../src/execution-world/kernel.js";
 import { loadCompositeWorkspace } from "./composite-fixture.js";
 import { standardNativeBackends } from "../src/execution-world/native-backends.js";
 
+test("sealed runtime plans reuse verified integrity while mutable copies are rechecked", async () => {
+  const workspace = await loadReaderWorkspace();
+  const compiled = compileExecutionPlan(workspace);
+  const plan: ExecutionPlan = JSON.parse(JSON.stringify(compiled));
+  assert.equal(await sealExecutionPlan(plan), true);
+  assert.equal(executionPlanDigest(plan), compiled.digest);
+  assert.equal(await executionPlanDigestAsync(plan), compiled.digest);
+  assert.throws(() => {
+    plan.definition.workspace.sourceRootCommit = "f".repeat(40);
+  }, TypeError);
+  assert.throws(() => {
+    plan.digest = "0".repeat(64);
+  }, TypeError);
+
+  const stringify = JSON.stringify;
+  JSON.stringify = () => {
+    throw Error("Repeated serialization of sealed metadata");
+  };
+  try {
+    assert.equal(executionPlanDigest(plan), compiled.digest);
+    assert.equal(await executionPlanDigestAsync(plan), compiled.digest);
+  } finally {
+    JSON.stringify = stringify;
+  }
+
+  const changed: ExecutionPlan = structuredClone(plan);
+  changed.definition.workspace.sourceRootCommit = "f".repeat(40);
+  Object.freeze(changed);
+  assert.notEqual(executionPlanDigest(changed), plan.digest);
+  assert.notEqual(await executionPlanDigestAsync(changed), plan.digest);
+  assert.equal(await sealExecutionPlan(changed), false, "shallow freezing is not an integrity proof");
+
+  const resigned: ExecutionPlan = structuredClone(plan);
+  resigned.definition.workspace.sourceRootCommit = "e".repeat(40);
+  resigned.digest = executionPlanDigest(resigned);
+  assert.equal(await sealExecutionPlan(resigned), true);
+  assert.notEqual(executionPlanDigest(resigned), plan.digest);
+  workspace.sourceRootCommit = "d".repeat(40);
+  assert.equal(workspace.sourceRootCommit, "d".repeat(40), "sealing owned JSON leaves compiler inputs editable");
+});
+
+test("runtime plan sealing rejects accessor-backed metadata", async () => {
+  const plan: ExecutionPlan = compileExecutionPlan(await loadReaderWorkspace());
+  assert.equal(await sealExecutionPlan(Object.create(plan)), false, "inherited integrity fields cannot be sealed");
+  Object.defineProperty(plan.definition, "codec", { get: () => "camino-execution-plan-v1", enumerable: true });
+  await assert.rejects(sealExecutionPlan(plan), /INVALID_PLAN_JSON/);
+});
+
 test("optional targets close over calls into another package", async () => {
   const workspace = await loadCompositeWorkspace();
   const before = compileExecutionPlan(workspace).definition.operations.find(
@@ -385,7 +437,14 @@ test("public reflection contains nominal contracts and callable descriptors with
     components: [],
     routes: {},
   };
-  const snapshot = publicDefinitionSnapshot(plan, installation);
+  const kernel = compileKernelProgram(plan) as import("../src/execution-world/inspection.js").InspectionKernel;
+  const catalog = await clientContractCatalog(
+    plan,
+    installation,
+    installation.packages.map((pkg) => pkg.revision),
+    kernel,
+  );
+  const snapshot = await publicDefinitionSnapshot(plan, kernel, catalog);
   assert.ok(snapshot.rows.interfaces.length);
   assert.ok(snapshot.rows.queries.length);
   assert.ok(snapshot.rows.conformances.length);
@@ -400,5 +459,19 @@ test("public reflection contains nominal contracts and callable descriptors with
     assert.ok(!publicText.includes('"' + privateKey + '"'), privateKey);
   assert.ok(publicText.includes('"descriptor"'));
   assert.ok(publicText.includes('"scope":"class"'));
-  assert.equal(snapshot.id, publicDefinitionSnapshot(plan, installation).id);
+  assert.equal(snapshot.id, (await publicDefinitionSnapshot(plan, kernel, catalog)).id);
+  // Historical checked availability must survive a newer host compiler. If
+  // reflection silently regenerates the Kernel, this evidence disappears.
+  const historical = structuredClone(kernel);
+  const installed = historical.operations.find((operation) => !operation.unsupported)!;
+  assert.ok(installed);
+  installed.unsupported = "CHECKED_HISTORICAL_UNSUPPORTED";
+  const historicalCatalog = await clientContractCatalog(
+    plan,
+    installation,
+    installation.packages.map((pkg) => pkg.revision),
+    historical,
+  );
+  const historicalSnapshot = await publicDefinitionSnapshot(plan, historical, historicalCatalog);
+  assert.match(JSON.stringify(historicalSnapshot.rows.conformances), /CHECKED_HISTORICAL_UNSUPPORTED/);
 });

test/fixtures/query-workspace.ts

@@ -8,10 +8,18 @@ export const queryFixtureSource = {
   repository: "https://query-fixture.example.test/source.git",
   commit: "1".repeat(40),
 };
-export async function queryWorkspaceFixture(options: { live?: boolean } = {}) {
+export async function queryWorkspaceFixture(options: { live?: boolean; snapshot?: boolean } = {}) {
   const interfaces = new Map<string, InterfaceRevision>();
   const sources: Record<string, string> = {};
   function iface(name: string, members: string, parameters = "") {
+    if (options.snapshot) members = members.replaceAll(" ordered", "");
+    if (options.snapshot)
+      for (const member of ["name", "title", "done", "rank", "assignee", "items"])
+        for (const operation of ["get", "resolve"])
+          members = members.replace(
+            `${operation} id "${member}:${operation}";`,
+            `${operation} id "${member}:${operation}" execution snapshot;`,
+          );
     const text = `${[...interfaces.keys()].map((name) => `import interface ${name};`).join("\n")}
       interface ${name}${parameters} id "${name}" revision "${name}@1" {${members}}`;
     sources[name] = text;
@@ -117,7 +125,7 @@ export async function queryWorkspaceFixture(options: { live?: boolean } = {}) {
     ${implementation("Task")} ${implementation("Reminder")}
     conform Tasks as Collection<interface TaskFacts> id "tasks-collection" {
       private edge Items id "items" {
-        atom Tasks projection items id "items:forward" many ordered;
+        atom Tasks projection items id "items:forward" many${options.snapshot ? "" : " ordered"};
         interface TaskFacts projection collections id "items:inverse" many;
       }
       bind items.resolve to edge Items.items.resolve;

test/managed-source-path.test.ts

@@ -0,0 +1,32 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { managedResourcePath } from "../src/capability-language/managed-source-path.js";
+
+test("source registration permits an outer workbench alias, never nested checkout or resources symlinks", async (t) => {
+  const scratch = await fs.mkdtemp(path.join(os.tmpdir(), "qx-managed-source-path-"));
+  t.after(() => fs.rm(scratch, { recursive: true, force: true }));
+  const root = path.join(scratch, "retained/workbench"),
+    alias = path.join(scratch, "guest"),
+    outside = path.join(scratch, "outside");
+  await fs.mkdir(path.join(root, "resources/Package"), { recursive: true });
+  await fs.mkdir(outside);
+  await fs.symlink(root, alias);
+  for (const registered of [
+    "resources/Package",
+    path.join(alias, "resources/Package"),
+    path.relative(root, path.join(alias, "resources/Package")),
+  ])
+    assert.equal(await managedResourcePath(alias, registered), "resources/Package");
+  await fs.symlink(path.join(root, "resources/Package"), path.join(root, "resources/Alias"));
+  await assert.rejects(managedResourcePath(root, "resources/Alias"), /crosses a symlink/);
+  await fs.symlink(outside, path.join(root, "resources/Escape"));
+  await assert.rejects(managedResourcePath(root, "resources/Escape"), /escapes the workbench/);
+  await fs.mkdir(path.join(outside, "resources/Package"), { recursive: true });
+  await assert.rejects(managedResourcePath(root, path.join(outside, "resources/Package")), /escapes the workbench/);
+  await fs.rename(path.join(root, "resources"), path.join(root, "relocated-resources"));
+  await fs.symlink(path.join(root, "relocated-resources"), path.join(root, "resources"));
+  await assert.rejects(managedResourcePath(root, "resources/Package"), /crosses a symlink/);
+});

test/pin-upgrades.test.ts

@@ -5,9 +5,90 @@ import os from "node:os";
 import path from "node:path";
 import { promisify } from "node:util";
 import { execFile as callback } from "node:child_process";
-import { planPinUpgrades, applyPinUpgrades, type UpgradeEffects } from "../src/capability-language/pin-upgrades.js";
+import {
+  planPinUpgrades,
+  applyPinUpgrades,
+  discoverUpgradeSpec,
+  reviewUpgradeCandidate,
+  type UpgradeEffects,
+} from "../src/capability-language/pin-upgrades.js";
+import { capabilityId } from "../src/capability-model/index.js";
+import { makeValidCapabilityWorkspace } from "./fixtures/capability-model.js";
 const execFile = promisify(callback);
 
+test("execution pin upgrades accept unchanged shared attachments without legacy migration planning", async (context) => {
+  const artifact = await fs.mkdtemp(path.join(os.tmpdir(), "qx-upgrade-execution-review-"));
+  context.after(() => fs.rm(artifact, { recursive: true, force: true }));
+  await fs.writeFile(path.join(artifact, "execution-plan.json"), "{}");
+  const baseline = makeValidCapabilityWorkspace();
+  assert.ok(baseline.sharedAttachments.length);
+  const candidate = structuredClone(baseline);
+  candidate.sourceRootCommit = "f".repeat(40);
+  const { filename, review } = await reviewUpgradeCandidate({ artifact, baseline, candidate });
+  assert.equal(filename, "semantic-review.json");
+  assert.equal(review.checkerVersion, "quixos-semantic-review-v1");
+  assert.deepEqual(review.blockers, []);
+  assert.equal("migrationRequired" in review, false);
+  assert.equal("runtimeActions" in review, false);
+});
+
+test("execution pin upgrades require exact semantic-major receipts and reject foreign workspaces", async (context) => {
+  const artifact = await fs.mkdtemp(path.join(os.tmpdir(), "qx-upgrade-semantic-review-"));
+  context.after(() => fs.rm(artifact, { recursive: true, force: true }));
+  await fs.writeFile(path.join(artifact, "execution-plan.json"), "{}");
+  const baseline = makeValidCapabilityWorkspace();
+  baseline.conformances[0]!.id = capabilityId.conformance("conformance:project:named");
+  const candidate = structuredClone(baseline);
+  candidate.conformances[0]!.semanticMajor = 2;
+  const { review } = await reviewUpgradeCandidate({ artifact, baseline, candidate });
+  assert.equal(review.reviews.length, 1);
+  assert.equal(review.reviews[0]!.accepted, false);
+  assert.match(review.blockers[0]!, /Semantic-major review required/);
+  const receipt = {
+    requirementDigest: review.reviews[0]!.requirementDigest,
+    decision: "accepted-unchanged" as const,
+    rationale: "Reviewed the consumer against the provider's unchanged label behavior",
+    agentId: "upgrade-fixture-agent",
+  };
+  assert.deepEqual(
+    (await reviewUpgradeCandidate({ artifact, baseline, candidate, reviews: [receipt] })).review.blockers,
+    [],
+  );
+  candidate.packageImports[0]!.source.commit = "f".repeat(40);
+  assert.equal(
+    (await reviewUpgradeCandidate({ artifact, baseline, candidate, reviews: [receipt] })).review.reviews[0]!.accepted,
+    false,
+  );
+  candidate.workspaceId = capabilityId.workspace("workspace:foreign");
+  await assert.rejects(() => reviewUpgradeCandidate({ artifact, baseline, candidate }), /different workspace/);
+});
+
+test("nonexecution pin upgrades retain their evolution checks", async (context) => {
+  const artifact = await fs.mkdtemp(path.join(os.tmpdir(), "qx-upgrade-evolution-review-"));
+  context.after(() => fs.rm(artifact, { recursive: true, force: true }));
+  const baseline = makeValidCapabilityWorkspace();
+  const { filename, review } = await reviewUpgradeCandidate({
+    artifact,
+    baseline,
+    candidate: structuredClone(baseline),
+  });
+  assert.equal(filename, "evolution.json");
+  assert.equal(review.checkerVersion, "quixos-evolution-v1");
+  assert.ok(review.blockers.some((message) => message.includes("legacy workspace-shared attachments")));
+  assert.equal("migrationRequired" in review, true);
+});
+
+test("unexpected artifact access failures do not select nonexecution checks", async (context) => {
+  const directory = await fs.mkdtemp(path.join(os.tmpdir(), "qx-upgrade-review-failure-"));
+  context.after(() => fs.rm(directory, { recursive: true, force: true }));
+  const artifact = path.join(directory, "not-a-directory");
+  await fs.writeFile(artifact, "not an artifact");
+  const candidate = makeValidCapabilityWorkspace();
+  await assert.rejects(() => reviewUpgradeCandidate({ artifact, baseline: candidate, candidate }), {
+    code: "ENOTDIR",
+  });
+});
+
 test(
   "real jj snapshots and immutable Git publication propagate a changed interface into the root",
   { skip: !process.env.QX_CHECK_GENERATOR },
@@ -73,6 +154,21 @@ test(
       await run(workbench, "git", ["--git-dir", path.join(workbench, "remotes/named.git"), "show-ref"]),
       new RegExp(commit),
     );
+    assert.equal(graph.resources[0].directory, "resources/Named");
+    assert.equal(graph.directResources[0].directory, "resources/Named");
+    // A retained workbench can move without keeping its original absolute path
+    // alive. Recovery journals remain bound to their original writer/root.
+    const relocated = `${workbench}-relocated`;
+    context.after(() => fs.rm(relocated, { recursive: true, force: true }));
+    await fs.cp(workbench, relocated, { recursive: true });
+    const discovered = await discoverUpgradeSpec(relocated);
+    assert.equal(discovered.nodes[1]!.directory, "resources/Named");
+    const relocatedPlan = await planPinUpgrades(relocated, { ...discovered, bootstrap: true });
+    assert.equal(relocatedPlan.workbench, relocated);
+    assert.deepEqual(
+      relocatedPlan.nodes.map((node) => node.directory),
+      ["resources/Named", "root"],
+    );
   },
 );
 
@@ -80,6 +176,9 @@ for (const dependencyKind of ["interface", "build"] as const)
   test(`${dependencyKind} pin upgrades publish children before parent locks and resume without republishing completed nodes`, async (context) => {
     const workbench = await fs.mkdtemp(path.join(os.tmpdir(), "qx-upgrade-test-"));
     context.after(() => fs.rm(workbench, { recursive: true, force: true }));
+    const alias = `${workbench}-guest-alias`;
+    await fs.symlink(workbench, alias);
+    context.after(() => fs.unlink(alias));
     const from = "a".repeat(40),
       to = "b".repeat(40),
       framework = "c".repeat(40);
@@ -148,7 +247,15 @@ for (const dependencyKind of ["interface", "build"] as const)
     await fs.mkdir(path.join(workbench, ".quixos"), { recursive: true });
     await fs.writeFile(
       path.join(workbench, ".quixos/resource-graph.json"),
-      JSON.stringify({ resources: [{ ...sources[1], source: { resolver: "git", ...sources[1].source } }] }),
+      JSON.stringify({
+        resources: [
+          {
+            ...sources[1],
+            directory: path.join(alias, sources[1].directory),
+            source: { resolver: "git", ...sources[1].source },
+          },
+        ],
+      }),
     );
     assert.deepEqual(
       plan.nodes.map((node) => node.directory),
@@ -179,6 +286,7 @@ for (const dependencyKind of ["interface", "build"] as const)
     assert.deepEqual(published, ["resources/Named", "root"]);
     const graph = JSON.parse(await fs.readFile(path.join(workbench, ".quixos/resource-graph.json"), "utf8"));
     assert.equal(graph.resources.length, 1);
+    assert.equal(graph.resources[0].directory, "resources/Named");
     assert.equal(graph.resources[0].source.commit, to);
     const next = await planPinUpgrades(workbench, {
       nodes: [sources[0], { ...sources[1], source: graph.resources[0].source }],

test/placement.test.ts

@@ -6,10 +6,64 @@ import {
   compileExecutionPlan,
   hexDigest,
   inspectJavaScriptSurface,
+  inspectRestrictedImplementation,
+  restrictedSDKIdentity,
+  restrictedSDKPath,
+  type ArtifactImplementation,
   reportExecutionPlacement,
   type ExecutionInstallation,
 } from "../src/execution-world/index.js";
 
+test("restricted SDK identity ignores build comments and positions, preserving executable syntax", () => {
+  const source = 'export function value() { return ("hello"); }';
+  const x86 = "// /nix/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-core/dist/portable.js\n" + source;
+  const arm = "// /nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-core/dist/portable.js\n\n" + source;
+  assert.equal(restrictedSDKIdentity(x86), restrictedSDKIdentity(arm));
+  for (const changed of [
+    'export function value() { return ("goodbye"); }',
+    'export function value() { return\n("hello"); }',
+    'export function value() { fetch("hello"); }',
+    'import x from "node:fs"; ' + source,
+    'export function value() { return "/nix/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-core"; }',
+  ])
+    assert.notEqual(restrictedSDKIdentity(source), restrictedSDKIdentity(changed));
+  assert.notEqual(restrictedSDKIdentity('"use strict";'), restrictedSDKIdentity('"use\\x20strict";'));
+  assert.notEqual(restrictedSDKIdentity('const value="// comment";'), restrictedSDKIdentity('const value="";'));
+  assert.throws(() => restrictedSDKIdentity("const ???"));
+  assert.throws(() => restrictedSDKIdentity(" ".repeat(2 * 1024 * 1024 + 1)), /ANALYSIS_LIMIT/);
+});
+
+test("restricted admission accepts the same SDK syntax and rejects changed SDK behavior", async () => {
+  const source = "export const registry = {};";
+  const sdk = 'export const value = "trusted";';
+  const implementation: ArtifactImplementation = {
+    id: "restricted",
+    target: "server",
+    compatibility: "quixos-restricted-module-v1",
+    path: "module.mjs",
+    ports: "quixos-transaction-ports-v1",
+    registryExport: "registry",
+    exports: ["value"],
+    contentDigest: "a".repeat(64),
+    files: [
+      { path: "module.mjs", digest: "b".repeat(64), bytes: source.length, mediaType: "text/javascript" },
+      { path: restrictedSDKPath, digest: "c".repeat(64), bytes: sdk.length, mediaType: "text/javascript" },
+    ],
+  };
+  const check = (candidateSDK: string) => {
+    implementation.files[1]!.bytes = Buffer.byteLength(candidateSDK);
+    return inspectRestrictedImplementation(
+      "package:test@1",
+      implementation,
+      async (_revision, path) => Buffer.from(path === restrictedSDKPath ? candidateSDK : source),
+      restrictedSDKIdentity(sdk),
+    );
+  };
+  assert.deepEqual(await check("// a different build path\n" + sdk), []);
+  assert.equal((await check('export const value = "untrusted";'))[0]?.code, "RESTRICTED_SDK_UNSUPPORTED");
+  assert.equal((await check("export const ???"))[0]?.code, "RESTRICTED_SDK_UNSUPPORTED");
+});
+
 test("compiled-source inspection finds authority imports and ambient facilities without executing code", () => {
   const surface = inspectJavaScriptSurface(
     `

test/presentations.test.ts

@@ -19,12 +19,16 @@ import {
   expectedArtifactReceipt,
   checkExecutionInstallation,
   clientContractCatalog,
+  createClientContractCatalog,
+  CandidateMetadataBudget,
+  compileKernelProgram,
   type ComponentArtifact,
   type PackageArtifacts,
 } from "../src/execution-world/index.js";
 import { validateWorkspaceRevision } from "../src/capability-model/index.js";
 import { presentationDeclarations, preparationArtifact } from "../src/react-build/declarations.js";
 import { compileQueryComposition } from "../src/query/composition.js";
+import type { InspectionKernel } from "../src/execution-world/inspection.js";
 
 const source = { repository: "https://example.test/components.git", commit: "a".repeat(40) };
 const contract = (name: string) => {
@@ -245,16 +249,68 @@ test("checked component-only artifacts install without a service and reject miss
     assert.ok(installation.routes[installation.components[0]!.url]);
     assert.equal(JSON.stringify(installation.components).includes(root), false);
     assert.equal(JSON.stringify(installation.components).includes("slot:"), false);
-    const catalog = clientContractCatalog(plan, installation, [pkg.revision]);
+    const catalog = await clientContractCatalog(plan, installation, [pkg.revision]);
     assert.equal(catalog.presentations[0]!.component, "component:card");
     assert.equal(catalog.components[0]!.subject, "interface:Data@1");
     assert.equal(JSON.stringify(catalog).includes(root), false);
     assert.equal(JSON.stringify(catalog).includes("bindingSchema"), false);
-    assert.throws(() => clientContractCatalog(plan, installation, ["absent"]), /UNINSTALLED_PACKAGE/);
-    assert.throws(
+    await assert.rejects(() => clientContractCatalog(plan, installation, ["absent"]), /UNINSTALLED_PACKAGE/);
+    await assert.rejects(
       () => clientContractCatalog(plan, { ...installation, plan: "bad" }, [pkg.revision]),
       /CATALOG_PLAN_MISMATCH/,
     );
+    const budget = new CandidateMetadataBudget();
+    const scope = budget.acquire("catalog-test");
+    const prepared = createClientContractCatalog(
+      plan,
+      installation,
+      scope,
+      compileKernelProgram(plan) as InspectionKernel,
+    );
+    try {
+      await assert.rejects(() => prepared.select(["absent"]), /UNINSTALLED_PACKAGE/);
+      assert.equal(scope.bytes, 0, "Unknown requests do not allocate compiler metadata");
+      const [first, coalesced] = await Promise.all([prepared.select([pkg.revision]), prepared.select([pkg.revision])]);
+      assert.deepEqual(first, catalog);
+      assert.equal(first.operations, coalesced.operations, "Concurrent preparation shares one metadata reservation");
+      const retained = scope.bytes;
+      assert.ok(retained > 0);
+      assert.ok(retained < 32 * 1024 * 1024, "Small catalogs retain a proportional metadata charge");
+      const full = await prepared.select([pkg.revision]);
+      const empty = await prepared.select([]);
+      assert.deepEqual(empty.components, []);
+      assert.deepEqual(empty.presentations, []);
+      assert.deepEqual(empty.moduleBindings, []);
+      assert.equal(empty.operations, full.operations, "Shared compiled metadata is reused");
+      assert.equal(Object.isFrozen(full.operations), true);
+      // Any plan access now would reveal a repeated digest/compile on the warm path.
+      const definition = plan.definition;
+      Object.defineProperty(plan, "definition", {
+        configurable: true,
+        get() {
+          throw Error("RECOMPILED_PLAN");
+        },
+      });
+      try {
+        assert.deepEqual(await prepared.select([pkg.revision]), full);
+        assert.equal(scope.bytes, retained, "Package projections do not accumulate cache entries");
+      } finally {
+        Object.defineProperty(plan, "definition", { configurable: true, value: definition });
+      }
+      prepared.close();
+      assert.equal(scope.bytes, 0);
+      await assert.rejects(() => prepared.select([pkg.revision]), /CANDIDATE_METADATA_CLOSED/);
+    } finally {
+      prepared.close();
+      scope.release();
+    }
+    const tight = new CandidateMetadataBudget({ bytes: 1000, ownerBytes: 1000, candidates: 1 });
+    const tightScope = tight.acquire("catalog-test");
+    const refused = createClientContractCatalog(plan, installation, tightScope);
+    await assert.rejects(() => refused.select([pkg.revision]), /CANDIDATE_METADATA_LIMIT/);
+    assert.equal(tightScope.bytes, 0);
+    refused.close();
+    tightScope.release();
   } finally {
     await rm(root, { recursive: true, force: true });
   }

test/query-compiler.test.ts

@@ -520,7 +520,7 @@ test("React tooling generates checked owner queries from imported closed navigat
   if (parsed.resource.kind !== "package") throw Error("package required");
   const contracts = [...dependencies, ...(parsed.resource.specializations ?? [])];
   const documents = presentationQueries(parsed.resource.revision, contracts);
-  assert.equal(documents.size, 2);
+  assert.equal(documents.size, 4);
   const checked = await Promise.all(
     parsed.resource.revision.queries!.map((query) =>
       compileQuery(query, contracts, async (name) => documents.get(name)!),
@@ -528,10 +528,16 @@ test("React tooling generates checked owner queries from imported closed navigat
   );
   assert.deepEqual(
     checked.map((query) => query.declaration.placement?.kind),
-    ["replica", "local"],
+    ["replica", "local", "replica", "local"],
   );
   assert.match(JSON.stringify(checked[0]!.output), /"custom":\{"kind":"record","fields":\{"label"/);
   assert.match(JSON.stringify(checked[0]!.selection), /"kind":"as"/);
+  for (const identity of checked.slice(2)) {
+    assert.match(identity.declaration.id, /:identity-(inputs|view)$/);
+    assert.doesNotMatch(JSON.stringify(identity.output), /"custom"/);
+    assert.match(JSON.stringify(identity.output), /_presentationOccurrence/);
+    assert.match(JSON.stringify(identity.output), /_presentationSource/);
+  }
   assert(
     checked.every((query) =>
       query.effects.some((effect) => effect.memberId === "mount" && effect.uses.includes("predicate")),

test/query-tree-fixture.ts

@@ -0,0 +1,37 @@
+import { queryWorkspaceFixture } from "./fixtures/query-workspace.js";
+import { compileQuery } from "../src/query/compile.js";
+import { queryTreeProjections } from "../src/query/tree.js";
+import { linkQueries } from "../src/query/link.js";
+import { compileExecutionPlan } from "../src/execution-world/plan.js";
+
+export async function queryTreeFixture() {
+  const fixture = await queryWorkspaceFixture({ live: true, snapshot: true });
+  const declaration = {
+    ...fixture.pkg.queries!.find((query) => query.id === "upcoming")!,
+    id: "tree",
+    displayName: "Tree",
+    operation: "Tree",
+    placement: { kind: "replica" as const },
+    fragments: [],
+  };
+  const checked = await compileQuery(
+    declaration,
+    fixture.interfaces,
+    async () => `query Tree($first:Int!, $details:Boolean!) {
+    root {items(first:$first) {entries {node {
+      ...Heading @boundary(name:"basic") ...Details @boundary(name:"details") @include(if:$details)
+      assignee {...Person @boundary(name:"person")}
+    }}}}
+  } fragment Heading on TaskFacts {title} fragment Details on TaskFacts {rank done}
+    fragment Person on PersonFacts {name}`,
+  );
+  const projections = queryTreeProjections(checked);
+  fixture.pkg.queries = [declaration, ...projections.map((query) => query.declaration)];
+  fixture.pkg.checkedQueries = [checked, ...projections];
+  // Workspace imports retain the checked Package by value in the assembler.
+  const imported = fixture.workspace.packageImports.find((pkg) => pkg.revisionId === fixture.pkg.revisionId)!;
+  imported.queries = fixture.pkg.queries;
+  imported.checkedQueries = fixture.pkg.checkedQueries;
+  fixture.workspace.linkedQueries = linkQueries(fixture.workspace);
+  return { ...fixture, plan: compileExecutionPlan(fixture.workspace) };
+}

test/query-tree.test.ts

@@ -0,0 +1,206 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { compileCapabilityResourceSource } from "../src/capability-language/index.js";
+import { compileQuery } from "../src/query/compile.js";
+import type { InterfaceRevision } from "../src/capability-model/types.js";
+
+const source = { repository: "https://example.test/tree", commit: "a".repeat(40) };
+function iface(text: string, dependencies: InterfaceRevision[] = []) {
+  const result = compileCapabilityResourceSource(text, {
+    source,
+    environment: {
+      interfaces: new Map(dependencies.map((value) => [value.displayName, value])),
+      interfaceClosure: dependencies,
+    },
+  });
+  assert.ok(result.ok, JSON.stringify(result.diagnostics));
+  if (result.resource.kind !== "interface") throw Error("Expected Interface");
+  return result.resource.revision;
+}
+const item = iface(`interface Item id "item" revision "item@1" {
+  queryable value title id "title" : string {get id "title:get" execution snapshot;}
+  queryable value body id "body" : string {get id "body:get" execution snapshot;}
+}`);
+const navigation = iface(
+  `import interface Item; interface Navigation id "nav" revision "nav@1" {
+  queryable value chrome id "chrome" : string {get id "chrome:get" execution snapshot;}
+  queryable relation document id "document" : optional-one interface Item {resolve id "document:resolve" execution snapshot;}
+  queryable relation items id "items" : many interface Item ordered {resolve id "items:resolve" execution snapshot;}
+}`,
+  [item],
+);
+function declaration(root: InterfaceRevision = item, dependencies: InterfaceRevision[] = []) {
+  const result = compileCapabilityResourceSource(
+    `import interface ${root.displayName}; package Views id "views" revision "views@1" {
+    query Open id "open" root ${root.displayName} document "open.graphql" operation "Open" {replica; max rows 10;}
+  }`,
+    {
+      source,
+      environment: { interfaces: new Map([[root.displayName, root]]), interfaceClosure: [root, item, ...dependencies] },
+    },
+  );
+  assert.ok(result.ok, JSON.stringify(result.diagnostics));
+  if (result.resource.kind !== "package") throw Error("Expected Package");
+  return result.resource.revision.queries![0]!;
+}
+const fragments = `fragment Heading on Item {title} fragment Body on Item {body}`;
+test("boundaries remain complete typed projections; ordinary spreads stay inline", async () => {
+  const checked = await compileQuery(
+    declaration(),
+    [item],
+    async () => `query Open {root {...Heading ...Body @boundary(name:"body")}} ${fragments}`,
+  );
+  assert(checked.tree);
+  assert(!JSON.stringify(checked.output).includes('"body"'));
+  assert(!JSON.stringify(checked.selection).includes('"body"'));
+  const body = checked.tree.nodes.find((node) => node.id === "root/boundary/body")!;
+  assert(body);
+  assert(
+    JSON.stringify(checked.tree.projections.find((projection) => projection.id === body.projection)!.output).includes(
+      '"body"',
+    ),
+  );
+  assert.equal(checked.tree.nodes[0]!.boundaries[0]!.name, "body");
+  const ordinary = await compileQuery(
+    declaration(),
+    [item],
+    async () => `query Open {root {...Heading ...Body}} ${fragments}`,
+  );
+  assert.equal(ordinary.tree, undefined);
+  assert(JSON.stringify(ordinary.output).includes('"body"'));
+});
+test("minimal nullable-root bindings exclude slow siblings and carry child handles", async () => {
+  const checked = await compileQuery(
+    declaration(navigation),
+    [item, navigation],
+    async () => `query Open {root {
+    ...Chrome @boundary(name:"chrome") document {...Heading @boundary(name:"basic") ...Body @boundary(name:"body")}
+  }} fragment Chrome on Navigation {chrome} ${fragments}`,
+  );
+  const tree = checked.tree!;
+  const binding = tree.nodes[0]!.bindings[0]!;
+  assert.equal(binding.name, "document");
+  const projection = tree.projections.find((projection) => projection.id === binding.projection)!;
+  assert(!JSON.stringify(projection.selection).includes('"chrome"'));
+  assert(!JSON.stringify(projection.selection).includes('"title"'));
+  assert(!JSON.stringify(projection.selection).includes('"body"'));
+  assert.deepEqual(binding.targets[0]!.path, ["document"]);
+  assert.deepEqual(
+    tree.nodes.find((node) => node.id === binding.targets[0]!.node)!.boundaries.map((boundary) => boundary.name),
+    ["basic", "body"],
+  );
+});
+test("bounded list bindings preserve entry identity without requesting details", async () => {
+  const checked = await compileQuery(
+    declaration(navigation),
+    [item, navigation],
+    async () => `query Open {root {
+    items(first: 3) {entries {node {...Body @boundary(name:"body")}}}
+  }} fragment Body on Item {body}`,
+  );
+  const tree = checked.tree!,
+    binding = tree.nodes[0]!.bindings[0]!;
+  assert.deepEqual(binding.targets[0]!.path, ["items", "entries", "[]", "node"]);
+  const projection = tree.projections.find((projection) => projection.id === binding.projection)!;
+  assert(JSON.stringify(projection.selection).includes('"name":"key"'));
+  assert(!JSON.stringify(projection.selection).includes('"name":"body"'));
+  assert(tree.maxOccurrences <= 256);
+});
+test("literal collection windows bound handles independently of detail row budgets", async () => {
+  const source = { ...declaration(navigation), budgets: { ...declaration(navigation).budgets, rows: 20000 } };
+  const query = (limit: string, variables = "") => `query Open${variables} {root {
+    items(first: ${limit}) {entries {node {...Body @boundary(name:"body")}}}
+  }} fragment Body on Item {body}`;
+  const checked = await compileQuery(source, [item, navigation], async () => query("3"));
+  assert.equal(checked.tree!.maxOccurrences, 7);
+  await assert.rejects(
+    compileQuery(source, [item, navigation], async () => query("200")),
+    /QUERY_TREE_LIMIT/,
+  );
+  await assert.rejects(
+    compileQuery(source, [item, navigation], async () => query("$first", "($first:Int!)")),
+    /QUERY_TREE_LIMIT/,
+  );
+  const group = iface(
+    `import interface Item; interface Group id "group" revision "group@1" {
+    queryable relation items id "group:items" : many interface Item ordered {resolve id "group:items:resolve" execution snapshot;}
+  }`,
+    [item],
+  );
+  const groups = iface(
+    `import interface Group; interface Groups id "groups" revision "groups@1" {
+    queryable relation groups id "groups:groups" : many interface Group ordered {resolve id "groups:groups:resolve" execution snapshot;}
+  }`,
+    [item, group],
+  );
+  const nested = { ...declaration(groups, [group]), budgets: source.budgets };
+  const nestedQuery = (outer: number, inner: number) => `query Open {root {
+    groups(first:${outer}) {entries {node {items(first:${inner}) {entries {node {...Body @boundary(name:"body")}}}}}}
+  }} fragment Body on Item {body}`;
+  const bounded = await compileQuery(nested, [item, group, groups], async () => nestedQuery(2, 3));
+  assert.equal(bounded.tree!.maxOccurrences, 15, "Nested windows multiply instead of reusing the outer bound");
+  await assert.rejects(
+    compileQuery(nested, [item, group, groups], async () => nestedQuery(20, 20)),
+    /QUERY_TREE_LIMIT/,
+  );
+});
+test("guards control boundary participation and invalid syntax fails checking", async () => {
+  const checked = await compileQuery(
+    declaration(),
+    [item],
+    async () => `query Open($show:Boolean!) {root {
+    ...Body @boundary(name:"body") @include(if:$show)
+  }} fragment Body on Item {body}`,
+  );
+  assert.deepEqual(checked.tree!.nodes[0]!.boundaries[0]!.conditions, [
+    { include: true, value: { kind: "variable", name: "show" } },
+  ]);
+  for (const [text, error] of [
+    [`query Open {root {...Body @boundary(name:"")}} fragment Body on Item {body}`, /QUERY_BOUNDARY_NAME/],
+    [
+      `query Open($name:String!) {root {...Body @boundary(name:$name)}} fragment Body on Item {body}`,
+      /QUERY_BOUNDARY_NAME/,
+    ],
+    [
+      `query Open {root {...Body @boundary(name:"x") ...Heading @boundary(name:"x")}} ${fragments}`,
+      /QUERY_BOUNDARY_DUPLICATE/,
+    ],
+    [`query Open {root {body @boundary(name:"x")}}`, /QUERY_VALIDATION/],
+    [`query Open {root {...Cycle @boundary(name:"x")}} fragment Cycle on Item {...Cycle}`, /QUERY_VALIDATION/],
+  ] as const)
+    await assert.rejects(
+      compileQuery(declaration(), [item], async () => text),
+      error,
+    );
+});
+test("equivalent repeated paths share bindings; aliases preserve different windows", async () => {
+  const checked = await compileQuery(
+    declaration(navigation),
+    [item, navigation],
+    async () => `query Open {root {
+    document {...Heading @boundary(name:"basic")} document {...Body @boundary(name:"body")}
+    recent:items(first:2) {entries {node {...Body @boundary(name:"body")}}}
+    earlier:items(first:3) {entries {node {...Body @boundary(name:"body")}}}
+  }} ${fragments}`,
+  );
+  assert.deepEqual(
+    checked.tree!.nodes[0]!.bindings.map((binding) => binding.name),
+    ["document", "recent", "earlier"],
+  );
+  assert.deepEqual(
+    checked
+      .tree!.nodes.find((node) => node.id === "root/binding/document")!
+      .boundaries.map((boundary) => boundary.name),
+    ["basic", "body"],
+  );
+  await assert.rejects(
+    compileQuery(
+      declaration(navigation),
+      [item, navigation],
+      async () => `query Open($show:Boolean!) {root {
+    document @include(if:$show) {...Heading @boundary(name:"basic")} document {...Body @boundary(name:"body")}
+  }} ${fragments}`,
+    ),
+    /QUERY_TREE_BINDING_CONFLICT/,
+  );
+});

test/qx-format-cli.test.ts

@@ -0,0 +1,55 @@
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+import { mkdtempSync, readFileSync, writeFileSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join, resolve } from "node:path";
+import test from "node:test";
+import { formatQx } from "../src/capability-language/source.js";
+
+const cli = resolve(process.cwd(), "dist/src/capability-language/tool-cli.js");
+const run = (...args: string[]) => spawnSync(process.execPath, [cli, "format", ...args], { encoding: "utf8" });
+const source = `workspace Test id "w" revision "w@1" commit "${"1".repeat(40)}" {\n// 雪 🦊 comment preserved\n}\n`;
+
+test("QX batch checks are read-only; writes match single-file formatting and remain idempotent", (t) => {
+  const root = mkdtempSync(join(tmpdir(), "qx-format-"));
+  t.after(() => rmSync(root, { recursive: true, force: true }));
+  const files = [join(root, "one.qx"), join(root, "two 雪.qx")];
+  for (const file of files) writeFileSync(file, source);
+  const check = run("--check", ...files);
+  assert.notEqual(check.status, 0, check.stderr);
+  for (const file of files) {
+    assert(check.stderr.includes(file));
+    assert.equal(readFileSync(file, "utf8"), source);
+  }
+  const single = run(files[0]!);
+  assert.equal(single.status, 0, single.stderr);
+  assert.equal(single.stdout, formatQx(source));
+  const write = run("--write", ...files);
+  assert.equal(write.status, 0, write.stderr);
+  for (const file of files) assert.equal(readFileSync(file, "utf8"), single.stdout);
+  assert.equal(run("--check", ...files).status, 0);
+  assert.equal(run("--write", ...files).stdout, "");
+  writeFileSync(files[0]!, source);
+  assert.equal(run(files[0]!, "--write").status, 0);
+  assert.equal(readFileSync(files[0]!, "utf8"), single.stdout);
+});
+
+test("QX batch errors report every failure and do not truncate valid work", (t) => {
+  const root = mkdtempSync(join(tmpdir(), "qx-format-errors-"));
+  t.after(() => rmSync(root, { recursive: true, force: true }));
+  const broken = join(root, "broken.qx"),
+    missing = join(root, "missing.qx"),
+    valid = join(root, "valid.qx");
+  writeFileSync(broken, "workspace { invalid");
+  writeFileSync(valid, source);
+  const result = run("--write", broken, missing, valid);
+  assert.notEqual(result.status, 0);
+  assert(result.stderr.includes(broken));
+  assert(result.stderr.includes(missing));
+  assert.equal(readFileSync(broken, "utf8"), "workspace { invalid");
+  assert.equal(readFileSync(valid, "utf8"), formatQx(source));
+  writeFileSync(valid, source);
+  assert.notEqual(run("--write", valid, "--unknown").status, 0);
+  assert.equal(readFileSync(valid, "utf8"), source, "Validate arguments before writing any file");
+  assert.notEqual(run("--check").status, 0);
+});

test/source-closure.test.ts

@@ -0,0 +1,236 @@
+import assert from "node:assert/strict";
+import { execFile as callback } from "node:child_process";
+import { promisify } from "node:util";
+import { mkdtemp, mkdir, writeFile, readFile, rm, symlink } from "node:fs/promises";
+import path from "node:path";
+import os from "node:os";
+import test from "node:test";
+import { pathToFileURL } from "node:url";
+import { materializeWorkspaceSources, workspaceSourcePin } from "../src/capability-language/source-closure.js";
+import { prepareDevelopmentSources } from "../src/capability-language/development-sources.js";
+import { backupWorkspaceSources, restoreWorkspaceSources } from "../src/capability-language/source-backup.js";
+
+const exec = promisify(callback);
+const lock = (resources: string) => `quixos-lock version 1 {
+ quixos source { repository "https://unavailable.test/toolchain.git"; commit "${"a".repeat(40)}"; }
+ ${resources}
+}`;
+test("exact source closure recovers through explicitly selected bundles, preserves history and rejects edits", async (context) => {
+  const temporary = await mkdtemp(path.join(os.tmpdir(), "qx-closure-"));
+  context.after(() => rm(temporary, { recursive: true, force: true }));
+  const locations: Record<string, string> = {};
+  const repository = async (name: string, resources: string) => {
+    const directory = path.join(temporary, name);
+    await mkdir(directory);
+    const git = async (...args: string[]) => (await exec("git", args, { cwd: directory })).stdout.trim();
+    await git("init");
+    await writeFile(path.join(directory, "quixos.lock"), lock(""));
+    await git("add", ".");
+    const commit = async () => {
+      await git("-c", "user.name=Test", "-c", "user.email=test@example.test", "commit", "-am", "Source");
+      return await git("rev-parse", "HEAD");
+    };
+    const parent = await commit();
+    await writeFile(path.join(directory, "quixos.lock"), lock(resources));
+    await writeFile(path.join(directory, "marker"), name);
+    await git("add", ".");
+    const rev = await commit();
+    await git("tag", `quixos-reachability/${rev}`);
+    const bundle = path.join(temporary, `${name}.bundle`);
+    await git("bundle", "create", bundle, `refs/tags/quixos-reachability/${rev}`);
+    const source = { repository: `https://unavailable.test/${name}.git`, commit: rev };
+    locations[source.repository] = pathToFileURL(bundle).href;
+    return { ...source, parent };
+  };
+  const common = await repository("common", "");
+  const dependency = `interface Common source { repository "${common.repository}"; commit "${common.commit}"; }`;
+  const left = await repository("left", dependency),
+    right = await repository("right", dependency);
+  const root = await repository(
+    "root",
+    `
+    package Left source { repository "${left.repository}"; commit "${left.commit}"; }
+    package Right source { repository "${right.repository}"; commit "${right.commit}"; }`,
+  );
+  const directory = path.join(temporary, "checkout");
+  const closure = await materializeWorkspaceSources({ source: root, directory, locations, concurrency: 2 });
+  assert.deepEqual(
+    await materializeWorkspaceSources({ source: root, directory, repositoryPrefix: "https://unavailable.test/" }),
+    closure,
+  );
+  // Allow this root but not its dependencies: reject them before Git acquisition.
+  const scopedRoot = { ...root, repository: "https://unavailable.test/selected/root.git" };
+  await assert.rejects(
+    materializeWorkspaceSources({
+      source: scopedRoot,
+      directory: path.join(temporary, "scoped"),
+      locations: { ...locations, [scopedRoot.repository]: locations[root.repository] },
+      repositoryPrefix: "https://unavailable.test/selected/",
+    }),
+    /outside the acquisition boundary/,
+  );
+  await assert.rejects(
+    materializeWorkspaceSources({ source: root, directory, repositoryPrefix: "https://unavailable.test/root.git/" }),
+    /outside the acquisition boundary/,
+  );
+  assert.equal(closure.resources.length, 4, "diamond dependency is materialized once");
+  assert.deepEqual(JSON.parse(await readFile(path.join(directory, "sources.json"), "utf8")), closure);
+  const rootEntry = closure.resources.find((entry) => entry.kind === "workspace")!;
+  const rootDirectory = path.join(directory, rootEntry.directory);
+  const rootLock = path.join(rootDirectory, "quixos.lock");
+  const rootBody = await readFile(rootLock, "utf8");
+  const outsideLock = path.join(temporary, "outside.lock");
+  await writeFile(outsideLock, rootBody);
+  // Exercise the shared loader directly: committed root symlinks must not let
+  // privileged source inspection read outside the acquired repository.
+  const { loadQuixosLock } = await import("../src/resource-lock/index.js");
+  const linkedLock = path.join(temporary, "linked.lock");
+  await symlink(outsideLock, linkedLock);
+  await assert.rejects(loadQuixosLock(linkedLock), /root locks must be ordinary/);
+  const backup = path.join(temporary, "retained");
+  const manifest = await backupWorkspaceSources({ source: root, directory, output: backup });
+  assert.equal(manifest.repositories.length, 4);
+  const restored = await restoreWorkspaceSources({ backup, directory: path.join(temporary, "restored") });
+  assert.deepEqual(restored, closure, "Source-only recovery retains canonical identity without an available forge");
+  await assert.rejects(backupWorkspaceSources({ source: root, directory, output: backup }), /must not exist/);
+  const missing = {
+    ...manifest,
+    repositories: manifest.repositories.filter((entry) => entry.repository !== common.repository),
+  };
+  await writeFile(path.join(backup, "backup.json"), JSON.stringify(missing));
+  await assert.rejects(
+    restoreWorkspaceSources({ backup, directory: path.join(temporary, "incomplete") }),
+    /omits required repository/,
+  );
+  await writeFile(path.join(backup, "backup.json"), JSON.stringify(manifest));
+  await writeFile(path.join(backup, manifest.repositories[0].bundle), "damaged backup");
+  await assert.rejects(
+    restoreWorkspaceSources({ backup, directory: path.join(temporary, "damaged") }),
+    /integrity mismatch/,
+  );
+  assert.equal((await exec("git", ["rev-parse", "HEAD^"], { cwd: rootDirectory })).stdout.trim(), root.parent);
+  assert.equal(
+    (await exec("git", ["remote", "get-url", "origin"], { cwd: rootDirectory })).stdout.trim(),
+    root.repository,
+  );
+  // Cached recovery does not need the primary or the backup.
+  assert.deepEqual(await materializeWorkspaceSources({ source: root, directory }), closure);
+  const pinFile = path.join(temporary, "source.json");
+  await writeFile(pinFile, JSON.stringify(root));
+  const cli = path.resolve(import.meta.dirname, "../src/capability-language/tool-cli.js");
+  const command = await exec(process.execPath, [cli, "source-checkout", pinFile, "--dir", directory]);
+  assert.deepEqual(JSON.parse(command.stdout), closure, "Protocol CLI preserves exact cached source identity");
+  const scoped = await exec(process.execPath, [
+    cli,
+    "source-checkout",
+    pinFile,
+    "--dir",
+    directory,
+    "--repository-prefix",
+    "https://unavailable.test/",
+  ]);
+  assert.deepEqual(JSON.parse(scoped.stdout), closure);
+  const cliBackup = path.join(temporary, "cli-backup");
+  const backupCommand = await exec(process.execPath, [
+    cli,
+    "source-backup",
+    pinFile,
+    "--dir",
+    directory,
+    "--output",
+    cliBackup,
+  ]);
+  assert.equal(JSON.parse(backupCommand.stdout).repositories.length, 4);
+  const restoreCommand = await exec(process.execPath, [
+    cli,
+    "source-restore",
+    cliBackup,
+    "--dir",
+    path.join(temporary, "cli-restore"),
+  ]);
+  assert.deepEqual(JSON.parse(restoreCommand.stdout), closure);
+  const developmentCommand = await exec(process.execPath, [
+    cli,
+    "source-develop",
+    pinFile,
+    "--dir",
+    path.join(temporary, "cli-developer"),
+    "--cache",
+    directory,
+  ]);
+  const developmentResult = JSON.parse(developmentCommand.stdout);
+  assert.equal(developmentResult.repositories, 4);
+  assert.deepEqual(developmentResult.source, closure.root);
+  const a = await prepareDevelopmentSources({
+    source: root,
+    cacheDirectory: directory,
+    directory: path.join(temporary, "a"),
+  });
+  const b = await prepareDevelopmentSources({
+    source: root,
+    cacheDirectory: directory,
+    directory: path.join(temporary, "b"),
+  });
+  assert.notEqual(a.workspaceId, b.workspaceId);
+  const assigned = "f8f2f8a3-328c-45a2-847a-31869ad28ce7";
+  const c = await prepareDevelopmentSources({
+    source: root,
+    cacheDirectory: directory,
+    directory: path.join(temporary, "assigned"),
+    workspaceId: assigned,
+  });
+  assert.equal(c.workspaceId, assigned);
+  assert.equal(
+    JSON.parse(await readFile(path.join(c.directory, ".quixos/resource-graph.json"), "utf8")).workspaceId,
+    assigned,
+  );
+  await assert.rejects(
+    prepareDevelopmentSources({
+      source: root,
+      cacheDirectory: directory,
+      directory: path.join(temporary, "invalid"),
+      workspaceId: "not-a-workspace",
+    }),
+    /Workspace UUID/,
+  );
+  const aRoot = path.join(a.directory, "root"),
+    bRoot = path.join(b.directory, "root");
+  assert.equal((await exec("git", ["remote", "get-url", "origin"], { cwd: aRoot })).stdout.trim(), root.repository);
+  assert.equal(
+    await readFile(path.join(aRoot, "quixos.lock"), "utf8"),
+    await readFile(path.join(rootDirectory, "quixos.lock"), "utf8"),
+  );
+  await exec("git", ["cat-file", "-e", root.parent], { cwd: aRoot });
+  await writeFile(path.join(aRoot, "marker"), "Independent developer change");
+  assert.equal(await readFile(path.join(bRoot, "marker"), "utf8"), "root");
+  assert.equal(await readFile(path.join(rootDirectory, "marker"), "utf8"), "root");
+  await assert.rejects(
+    prepareDevelopmentSources({ source: root, cacheDirectory: directory, directory: a.directory }),
+    /never overwritten/,
+  );
+  await writeFile(path.join(rootDirectory, "marker"), "edited");
+  await assert.rejects(materializeWorkspaceSources({ source: root, directory, locations }), /modified/);
+  await assert.rejects(
+    materializeWorkspaceSources({
+      source: root,
+      directory: path.join(temporary, "bounded"),
+      locations,
+      maxRepositories: 2,
+    }),
+    /repository limit/,
+  );
+  await assert.rejects(
+    materializeWorkspaceSources({
+      source: root,
+      directory,
+      locations: { [root.repository]: "https://secret:password@example.test/root.git" },
+    }),
+    /transport substitution/,
+  );
+});
+test("Workspace pins reject floating revisions and embedded credentials", () => {
+  assert.throws(() => workspaceSourcePin({ repository: "https://example.test/root.git", commit: "main" }));
+  assert.throws(() =>
+    workspaceSourcePin({ repository: "https://user:password@example.test/root.git", commit: "a".repeat(40) }),
+  );
+});

test/source-locks.test.ts

@@ -0,0 +1,46 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { mkdtemp, writeFile, readFile, rm } from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { workspaceSourceLocks } from "../src/capability-language/source-locks.js";
+
+test("fork lock proposals follow declared fragments and ignore comments and unrelated lock files", async (context) => {
+  const directory = await mkdtemp(path.join(os.tmpdir(), "qx-lock-fork-"));
+  context.after(() => rm(directory, { recursive: true, force: true }));
+  const from = { repository: "https://source.test/app/runtime.git", commit: "b".repeat(40) };
+  const to = { repository: "https://source.test/fork/runtime.git", commit: "c".repeat(40) };
+  const root = `quixos-lock version 1 {
+    quixos source { repository "https://source.test/quixos.git"; commit "${"a".repeat(40)}"; }
+    import "resources.lock";
+    // package Fake source { repository "https://unrelated.test/secret.git"; commit "${"d".repeat(40)}"; }
+  }`;
+  const fragment = `quixos-lock fragment version 1 {
+    // Preserve this note: 雨 📚
+    package Runtime source { repository "${from.repository}"; commit "${from.commit}"; }
+  }`;
+  await writeFile(path.join(directory, "quixos.lock"), root);
+  await writeFile(path.join(directory, "resources.lock"), fragment);
+  await writeFile(path.join(directory, "unrelated.lock"), "This is not a Quixos lock.");
+  const result = await workspaceSourceLocks(directory, [{ from, to }]);
+  assert.equal(result.lock.resources.length, 1);
+  assert.deepEqual(result.lock.resources[0].source, { resolver: "git", ...to });
+  assert.equal(result.files.find((file) => file.path === "quixos.lock")!.source, root);
+  assert.match(result.files.find((file) => file.path === "resources.lock")!.source, /Preserve this note: 雨 📚/);
+  assert.deepEqual(result.files.map((file) => file.path).sort(), ["quixos.lock", "resources.lock"]);
+  assert.equal(
+    await readFile(path.join(directory, "resources.lock"), "utf8"),
+    fragment,
+    "Proposing a fork does not edit selected source",
+  );
+  await assert.rejects(
+    workspaceSourceLocks(directory, [
+      { from, to },
+      { from, to },
+    ]),
+    /Duplicate/,
+  );
+  await assert.rejects(workspaceSourceLocks(directory, [{ from, to: { ...to, commit: "main" } }]), /exact commit/);
+  await writeFile(path.join(directory, "quixos.lock"), root.replace('"resources.lock"', '"../outside.lock"'));
+  await assert.rejects(workspaceSourceLocks(directory), /Invalid source lock/);
+});