- harden Matrix onboarding/chat lifecycle after manual QA
- refresh README and Matrix docs to match current behavior
- add local ignores for runtime artifacts and include current planning/report docs
Closes#7Closes#9Closes#14
- register archive and rename as client-aware closure handlers
- rename matrix rooms via stored surface_ref when a client is available
- keep archive scoped to core chat state for phase 1
- create new chat rooms inside the user's space
- store space-aware room metadata with next_chat_id
- handle room creation failures with user-facing messages
