Since story 884 the Matrix permission listener (and the sled uplink,
when configured) hold services.perm_rx for the process lifetime. The
WS chat handler's blocking `lock().await` on that same mutex therefore
parked the entire WS connection loop forever on StartChat: chat_fut was
never polled, RPC frames on the socket were never answered, and
everything queued behind the dispatcher's serial session lock —
wedging /mcp and /rpc while /health stayed green.
Use try_lock instead: if another task already owns permission routing,
run the chat without the local permission-forwarding select arm (a
pending future keeps the select shape unchanged).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019fHdm92yjvguPi2LiXfLB9
TimmyandClaude Fable 5
ba0a38d403