Restore generic Studio object navigation and discovery

test/execution-contracts.test.ts

@@ -89,7 +89,7 @@ package Reader id "package:reader" revision "package:reader@1" {
   assert.ok(transaction.ok, JSON.stringify(transaction.diagnostics));
 });
 
-test("query placement round-trips and local extents never claim complete membership", async () => {
+test("query placement distinguishes confirmed windows from local candidate extents", async () => {
   const { compileQuery } = await import("../src/query/compile.js");
   const { linkQueries } = await import("../src/query/link.js");
   const { toBinary, fromBinary, fromJson } = await import("@bufbuild/protobuf");
@@ -125,10 +125,8 @@ package Reader id "package:reader" revision "package:reader@1" {
     await compileQuery(admission, [iface], async () => document("Visible", "objects")),
     await compileQuery(local, [iface], async () => document("Presentation", "availableObjects")),
   ];
-  await assert.rejects(
-    compileQuery(local, [iface], async () => document("Presentation", "objects")),
-    /Cannot query field "objects"/,
-  );
+  const confirmed = await compileQuery(local, [iface], async () => document("Presentation", "objects"));
+  assert.equal(confirmed.selection[0]!.selection[0]!.name, "objects");
   const remote = structuredClone(iface);
   delete remote.members[0]!.operations[0]!.execution;
   await assert.rejects(

test/query-cursor-validation.test.ts

@@ -18,3 +18,17 @@ test("local relationship pages may reuse exactly the confirmed source window", a
   });
   assert.doesNotThrow(() => compileExecutionPlan(workspace));
 });
+
+test("local workspace objects reads the exact server window without adding local candidates", async () => {
+  const load = (first: number) =>
+    loadReaderWorkspace((name, text) => {
+      if (name === "ReaderRuntime.qx") return text.replace(/^.*query HighlightList id.*$/m, "");
+      if (name === "queries/highlight-list.graphql")
+        return text.replace("availableObjects(all: 200", `objects(first: ${first}`);
+      return text;
+    });
+  const workspace = await load(2);
+  assert.doesNotThrow(() => compileExecutionPlan(workspace));
+  const wrong = await load(3);
+  assert.throws(() => compileExecutionPlan(wrong), /REPLICA_WINDOW_MISMATCH/);
+});