09aa87103c
- Added write-token generation and validation to distinguish writable and read-only guests. - Added deep-link support using `https://<relay>/#<link>` with 32/48-byte collab secrets. - Added full-link and key-only semantics where full links grant writes and key-only links are view-only. - Added /collab view/status/stop command updates with read-only participant status and join hints.