fix(#2777): remove stale codex local home metadata (#2831)

* fix(#2777): remove stale codex local home metadata

* chore(#2777): add changeset for codex local layout metadata

---------

Co-authored-by: Tom Boucher <trekkie@nomorestars.com>

tests/capability-registry.test.cjs

@@ -3720,6 +3720,26 @@ describe('ADR-1016 phase 5a: validateArtifactLayout unit tests', () => {
     });
     assert.deepEqual(errors, []);
   });
+
+  test('#2777: home override is accepted globally and rejected locally', () => {
+    const entry = {
+      kind: 'skills',
+      destSubpath: 'skills',
+      prefix: 'gsd-',
+      nesting: 'flat',
+      recursive: false,
+      converter: null,
+      home: '.agents',
+    };
+
+    assert.deepEqual(validateArtifactLayout('test', { global: [entry], local: [] }), []);
+
+    const errors = validateArtifactLayout('test', { global: [], local: [entry] });
+    assert.ok(
+      errors.some((error) => error.includes('artifactLayout.local[0].home') && error.includes('project-scoped')),
+      'Expected local home override rejection, got: ' + JSON.stringify(errors),
+    );
+  });
 });
 
 // ── 24d-extra. FIX 3: tightened validateRuntimeBody / validateConfigHome ──────

tests/runtime-artifact-layout.test.cjs

@@ -23,6 +23,7 @@ const fs = require('fs');
 const path = require('path');
 
 const { resolveRuntimeArtifactLayout, findInstallSourceRoot } = require('../gsd-core/bin/lib/runtime-artifact-layout.cjs');
+const capabilityRegistry = require('../gsd-core/bin/lib/capability-registry.cjs');
 const installProfiles = require('../gsd-core/bin/lib/install-profiles.cjs');
 const { install } = require('../bin/install.js');
 const { createTempDir, cleanup } = require('./helpers.cjs');
@@ -121,6 +122,19 @@ describe('resolveRuntimeArtifactLayout — codex', () => {
   });
 });
 
+test('keeps every built-in local artifact layout project-scoped (#2777)', () => {
+  for (const [runtime, descriptor] of Object.entries(capabilityRegistry.runtimes)) {
+    const localEntries = descriptor.runtime?.artifactLayout?.local ?? [];
+    for (const entry of localEntries) {
+      assert.strictEqual(
+        Object.prototype.hasOwnProperty.call(entry, 'home'),
+        false,
+        `${runtime} local artifact layout entry '${entry.kind}' must not declare home`,
+      );
+    }
+  }
+});
+
 describe('resolveRuntimeArtifactLayout — copilot', () => {
   test('returns correct layout for copilot', () => {
     const layout = resolveRuntimeArtifactLayout('copilot', FAKE_DIR);