feat(cli): add remaining resources, fix descriptions from code review

New read-only resources:
- destinations (agent-to-agent ACL + routing map)
- user-dms (DM channel cache)
- dropped-messages (audit trail for dropped messages)
- approvals (in-flight approval cards)

Description fixes from reading source:
- messaging-groups: add denied_at column (router checks it)
- sessions: fix container_status (idle is unused, stopped is
  auto-restarted by sweep)
- wirings: add note that threaded adapters force per-thread

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

src/cli/resources/index.ts

@@ -8,4 +8,8 @@ import './wirings.js';
 import './users.js';
 import './roles.js';
 import './members.js';
+import './destinations.js';
+import './user-dms.js';
+import './dropped-messages.js';
+import './approvals.js';
 import './sessions.js';