Implement implicit object references and capability query foundations

test/query-compiler.test.ts

@@ -182,11 +182,36 @@ test("ordinary selections preserve aliases, fragment conditions and wire identit
   const node = checked.selection[0]!.selection[0]!.selection[0]!.selection[0]!;
   assert.deepEqual(
     node.selection.map((s) => s.key),
-    ["plain", "label", "due"],
+    ["plain", "label", "due", "_camino"],
   );
   assert.equal(node.selection[1]!.conditions.length, 1);
   assert.ok(JSON.stringify(checked.selection.map(querySelectionToWire)).includes("label"));
 });
+test("object references are unconditional, canonical and idempotent through fragments", async () => {
+  const checked = await compile(
+    `query Upcoming($show: Boolean!) {root {items(first: 3) {entries {node {...Row @include(if: $show)}}}}}`,
+    `fragment Row on TaskFacts {label: title identity: _camino {alias: ref} _camino @include(if: $show) {ref}}`,
+  );
+  const root = checked.selection[0]!;
+  const node = root.selection.find((s) => s.name === "items")!.selection[0]!.selection[0]!;
+  for (const object of [root, node]) {
+    const metadata = object.selection.filter((s) => s.key === "_camino");
+    assert.equal(metadata.length, 1);
+    assert.deepEqual(metadata[0]!.conditions, []);
+    assert.deepEqual(
+      metadata[0]!.selection.filter((s) => s.key === "ref").map((s) => s.conditions),
+      [[]],
+    );
+  }
+  assert.equal(node.selection.find((s) => s.key === "identity")!.conditions.length, 1);
+  const recompiled = await compileQuery(
+    { ...checked.declaration, fragments: [] },
+    [collection, facts],
+    async () => checked.document,
+  );
+  assert.deepEqual(recompiled.selection, checked.selection);
+  assert.deepEqual(recompiled.output, checked.output);
+});
 test("retired live syntax fails with migration guidance", async () => {
   for (const selected of ["score @live", "_camino @live {ref}", "title @live title", "title @live(unchecked: true)"])
     await assert.rejects(
@@ -199,6 +224,68 @@ test("retired live syntax fails with migration guidance", async () => {
     );
 });
 
+test("implicit references reject aliases which occupy the canonical metadata path", async () => {
+  for (const invalid of ["_camino: title", "_camino {ref: __typename}"])
+    await assert.rejects(compile(`query Upcoming {root {items(first: 3) {entries {node {...Row}}}}}`, `fragment Row on TaskFacts {${invalid}}`), /QUERY_VALIDATION|Introspection/);
+});
+
+test("implicit reference merges with conditional aggregate metadata", async () => {
+  const checked = await compileQuery({ ...fixture(""), fragments: [] }, [collection, facts], async () =>
+    `query Upcoming($show: Boolean!) {root {_camino @include(if: $show) {relations {items {aggregate {count}}}}}}`);
+  const metadata = checked.selection[0]!.selection.filter((field) => field.key === "_camino");
+  assert.equal(metadata.length, 1);
+  assert.deepEqual(metadata[0]!.conditions, []);
+  assert.equal(metadata[0]!.selection.find((field) => field.name === "relations")!.conditions.length, 1);
+  assert.deepEqual(metadata[0]!.selection.find((field) => field.name === "ref")!.conditions, []);
+  assert.equal(metadata[0]!.selection.find((field) => field.name === "relations")!.selection[0]!.selection[0]!.selection.some((field) => field.name === "_camino"), false);
+});
+
+test("qualified interface predicates and guaranteed inline projections retain nominal reads", async () => {
+  const owner = iface(
+    `interface Owner id "owner" revision "owner@1" { queryable value name id "name" : string {get id "name:get";} }`,
+  );
+  const owned = iface(
+    `import interface Owner;
+    interface Owned id "owned" revision "owned@1" {
+      queryable relation owner id "owner" : optional-one interface Owner {resolve id "owner:resolve";}
+      queryable value label id "owned:label" : string {get id "owned:label:get";}
+    }`,
+    [owner],
+  );
+  const item = iface(
+    `import interface Owned;
+    interface Item id "item" revision "item@1" requires Owned {
+      queryable value label id "item:label" : string {get id "item:label:get";}
+    }`,
+    [owned, owner],
+  );
+  const declaration = {
+    ...fixture(""),
+    root: { kind: "workspace-interface" as const, interface: item.revisionId },
+    fragments: [],
+  };
+  const document = `query Upcoming($owner: QxRef_Owner!) {root {objects(all: 10, where: {_camino: {as: {Owned: {owner: {eq: $owner}}}}}) {entries {node {label ... on Owned {owner {name} ownerLabel: label}}}}}}`;
+  const checked = await compileQuery(declaration, [item, owned, owner], async () => document);
+  assert.ok(
+    checked.effects.some(
+      (effect) =>
+        effect.interfaceRevisionId === owned.revisionId &&
+        effect.memberId === "owner" &&
+        effect.uses.includes("predicate"),
+    ),
+  );
+  const objects = checked.selection[0]!.selection[0]!;
+  assert.equal(objects.predicate?.kind, "and");
+  assert.ok(JSON.stringify(objects.predicate).includes('"kind":"as"'));
+  const node = objects.selection[0]!.selection[0]!;
+  assert.equal(node.selection.find((s) => s.key === "ownerLabel")!.interfaceRevisionId, owned.revisionId);
+  assert.equal(node.selection.filter((s) => s.key === "_camino").length, 1);
+  await assert.rejects(
+    compileQuery(declaration, [item, owned, owner], async () => document.replace("ownerLabel: label", "label")),
+    /QUERY_PROJECTION_CONFLICT|QUERY_VALIDATION/,
+  );
+});
+
 test("query dependency ports resolve exact exports without declaration ordering constraints", () => {
   const result = compileCapabilityResourceSource(
     `import interface Tasks;