feat(cli): wire nc CLI commands into container agent

Add delivery action handler (cli_request) so the host dispatches CLI
commands arriving from container agents via outbound.db and writes
responses back to inbound.db. Add nc MCP tool in the agent-runner
following the ask_user_question blocking pattern.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/index.ts

@@ -56,6 +56,7 @@ import './modules/index.js';
 // CLI command barrel — populates the `nc` registry before the CLI server
 // accepts connections.
 import './cli/commands/index.js';
+import './cli/delivery-action.js';
 import { startCliServer, stopCliServer } from './cli/socket-server.js';
 
 import type { ChannelAdapter, ChannelSetup } from './channels/adapter.js';