feat(macp): add registerMacpCommand for mosaic macp CLI surface

Adds mosaic macp tasks list|submit|gate|events tail subcommands to
@mosaicstack/macp, wires registerMacpCommand into the root mosaic CLI,
and ships a smoke test asserting command structure without touching disk
or starting an event emitter. Ref CU-05-08.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/mosaic/src/commands/gateway/recover-token.spec.ts

@@ -16,14 +16,9 @@ vi.mock('./daemon.js', () => ({
 
 vi.mock('./login.js', () => ({
   getGatewayUrl: vi.fn().mockReturnValue('http://localhost:14242'),
-}));
-
-// Mock readline so tests don't block on stdin
-vi.mock('node:readline', () => ({
-  createInterface: vi.fn().mockReturnValue({
-    question: vi.fn((_q: string, cb: (a: string) => void) => cb('test-input')),
-    close: vi.fn(),
-  }),
+  // promptLine/promptSecret are used by ensureSession; return fixed values so tests don't block on stdin
+  promptLine: vi.fn().mockResolvedValue('test@example.com'),
+  promptSecret: vi.fn().mockResolvedValue('test-password'),
 }));
 
 const mockFetch = vi.fn();