Make local graph execution optional across composed packages

test/local-first-reader.test.ts

@@ -2,6 +2,7 @@ import assert from "node:assert/strict";
 import { test } from "node:test";
 import { compileQuery } from "../src/query/compile.js";
 import { linkQueries } from "../src/query/link.js";
+import { compileExecutionPlan } from "../src/execution-world/plan.js";
 import { loadReaderWorkspace as load, readReaderFixture as read } from "./reader-fixture.js";
 test("complete reader contracts compose factories, portable selectors, CRDT edits, and bounded query scopes", async () => {
   const workspace = await load();
@@ -23,15 +24,19 @@ test("complete reader contracts compose factories, portable selectors, CRDT edit
   );
 });
 
-test("reader composition reports the dependency that weakens a portable promise", async () => {
-  await assert.rejects(
-    load((name, text) =>
-      name === "ReaderRuntime.qx"
-        ? text.replace(/(operation excerpt[\s\S]*?targets )\[browser, server\]/, "$1[server]")
-        : text,
-    ),
-    /does not provide execution target browser/,
+test("ordinary operations allow server fallback; explicitly local projections require local code", async () => {
+  const serverExcerpt = await load((name, text) =>
+    name === "ReaderRuntime.qx"
+      ? text.replace(/(operation excerpt[\s\S]*?targets )\[JavaScript, server\]/, "$1[server]")
+      : text,
   );
+  assert.throws(() => compileExecutionPlan(serverExcerpt), /NONPORTABLE_QUERY_FIELD/);
+  for (const pkg of serverExcerpt.packageImports)
+    pkg.queries = pkg.queries?.filter((q) => q.placement?.kind !== "local");
+  const fallback = compileExecutionPlan(serverExcerpt).definition.operations.find(
+    (op) => op.operationId === "highlight:excerpt:get",
+  )!;
+  assert.deepEqual(fallback.availableTargets, ["server"]);
   await assert.rejects(
     load((name, text) =>
       name === "ReaderRuntime.qx"
@@ -56,6 +61,6 @@ test("a field can remain server-queryable while failing local query placement",
   await compileQuery(admission, workspace.interfaceImports, read);
   await assert.rejects(
     compileQuery(local, workspace.interfaceImports, read),
-    /browser snapshot getter for HighlightData.color/,
+    /graph snapshot getter for HighlightData.color/,
   );
 });