- Cache terminal EndEvent on ProcessHandle so connect() can detect
already-exited processes instead of hanging forever on broadcast
receivers that missed the event. Subscribe before checking cache
to close the TOCTOU window.
- Protect sb.Status writes in Pause with m.mu to prevent data race
with concurrent readers (AcquireProxyConn, Exec, etc.).
- Restart metrics sampler in restoreRunning so a failed pause attempt
doesn't permanently kill sandbox metrics collection.
- Return dequeued non-input messages from coalescePtyInput instead of
dropping them, preventing silent loss of kill/resize signals during
typing bursts.
pptx704
aca43d51eb