Instrument and improve incremental workspace checks

Profile source capture, Nix evaluation/realization, resource/query checking,
and implementation builds without putting timings into immutable outputs.
Keep modular repositories; bound independent capture work, snapshot jj once
per observation, and retain final concurrent-edit and Git completeness checks.

Compose exact resource/closure/frontend/toolchain checks as memoized Nix
derivations. Preserve whole-workspace validation and the full compiler path
when no checked dependency is supplied. Share canonical Nixpkgs by content,
index workspace build contexts once, and narrow lock/driver/compiler inputs
with conservative complete-source fallback. Batch React witness checks only
when distinct source closures cannot share ambient declarations; otherwise
run the original independent TypeScript checks.

Seed local authoring toolchains with exact canonical fetch identities when
they match the selected inputs; retain store-path inputs for overrides.
Add generic correctness checks rather than permanent Reader timing/content
fixtures. Verify actual Reader edits and rejection/recovery in a private
workbench, preserving the original user's workbench and runtime.

Query checking currently caches at resource/closure boundaries, not individual
query semantic dependency boundaries. Template helper pins and reproducible
fixture snapshots follow in a separate publication change.

build-artifacts.mjs

@@ -1,4 +1,5 @@
 import { installDependencies } from "./install-dependencies.mjs";
+import { measureBuild } from "./build-profile.mjs";
 import { buildService } from "./build-service.mjs";
 import { buildComponents } from "./build-components.mjs";
 /** Trusted Nix build driver. No package-defined build hooks run between generation and witnessing. */
@@ -102,46 +103,50 @@ for (const { target, mode, settings } of builds) {
     source,
   );
   const entry = relative(settings.entries?.[target] ?? settings.entry);
-  execFileSync(
-    config.node,
-    [
-      config.tsc,
-      "--noEmit",
-      "--strict",
-      "--skipLibCheck",
-      "false",
-      "--target",
-      "es2024",
-      "--lib",
-      "es2024,dom,esnext.disposable",
-      "--module",
-      "nodenext",
-      "--moduleResolution",
-      "nodenext",
-      entry,
-    ],
-    { cwd: work, stdio: "inherit" },
+  measureBuild("portable-typecheck", { package: pkg.revision, target, mode }, () =>
+    execFileSync(
+      config.node,
+      [
+        config.tsc,
+        "--noEmit",
+        "--strict",
+        "--skipLibCheck",
+        "false",
+        "--target",
+        "es2024",
+        "--lib",
+        "es2024,dom,esnext.disposable",
+        "--module",
+        "nodenext",
+        "--moduleResolution",
+        "nodenext",
+        entry,
+      ],
+      { cwd: work, stdio: "inherit" },
+    ),
   );
   const bundlePath =
     mode === "remote" ? "share/quixos/remote/server/module.mjs" : `share/quixos/portable/${target}/module.mjs`;
   await fs.mkdir(path.dirname(path.join(output, bundlePath)), { recursive: true });
   const coreImport = target === "browser" ? coreURL : coreServer;
   const metadata = path.join(work, "bundle-meta.json");
-  execFileSync(
-    config.esbuild,
-    [
-      entry,
-      "--bundle",
-      `--platform=${target === "browser" ? "browser" : "node"}`,
-      "--format=esm",
-      "--minify-whitespace",
-      "--target=es2024",
-      `--outfile=${path.join(output, bundlePath)}`,
-      `--metafile=${metadata}`,
-      `--alias:@quixos/camino-replica-core=${coreImport}`,
-      `--external:${coreImport}`,
-    ],
-    { cwd: work, stdio: "inherit" },
+  measureBuild("portable-bundle", { package: pkg.revision, target, mode }, () =>
+    execFileSync(
+      config.esbuild,
+      [
+        entry,
+        "--bundle",
+        `--platform=${target === "browser" ? "browser" : "node"}`,
+        "--format=esm",
+        "--minify-whitespace",
+        "--target=es2024",
+        `--outfile=${path.join(output, bundlePath)}`,
+        `--metafile=${metadata}`,
+        `--alias:@quixos/camino-replica-core=${coreImport}`,
+        `--external:${coreImport}`,
+      ],
+      { cwd: work, stdio: "inherit" },
+    ),
   );
   const meta = JSON.parse(await fs.readFile(metadata, "utf8"));
   const built = Object.values(meta.outputs).find((o) => o.entryPoint);