test(objectql): control-plane leg of ADR-0029 D9's pin asserts the full ADR-0112 envelope (#7470)

The control-plane leg of protocol-object-overlay-layer.test.ts asserted only a
message substring, because deleteMetaItem's catch re-wrap used to drop `code`
(a repository refusal reached the caller as 403 with `code: undefined`). PR
#7466 (2c28df9) fixed the producer, so the constraint is gone: the leg now
asserts `code` + `status`, exactly like its project-kernel sibling, and the
message-substring check is dropped (the sibling carries none).

Reverse-verified: with packages/metadata-protocol/src/protocol.ts reverted to
2c28df9^ and rebuilt, exactly this one test goes red (expected undefined to
be 'NOT_OVERRIDABLE'); restored, 16/16 green.

Refs #7470, #7426, #7466.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MwoubC3jL271FYt9rGXwxb

Author: claude

packages/objectql/src/protocol-object-overlay-layer.test.ts

@@ -400,7 +400,8 @@ describe('ADR-0029 D9.7 — the delete is a SUBTRACTION, and #7012\'s guard is r
             .deleteMetaItem({ type: 'object', name: 'myapp_invoice' })
             .then(() => null, (e: any) => e);
         expect(refused).toBeInstanceOf(Error);
-        expect(String(refused.message)).toContain('NOT_OVERRIDABLE');
+        expect(refused.code).toBe('NOT_OVERRIDABLE');
+        expect(refused.status).toBe(403);
 
         const b = await bootWithPackage(seed, { controlPlane: true });
         await withObjectWritable(() => b.protocol.deleteMetaItem({ type: 'object', name: 'myapp_invoice' }));