- session_manager: add session to _local_cache in create_session()
so get_session() and get_active_sessions() work without Redis/Postgres
- message_bus: use asyncio.create_task() in request() for publish
so handler runs concurrently and timeout actually fires
All 76 tests pass now.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>