When gt handoff killed pane processes before respawning, the pane would
be destroyed (since remain-on-exit defaults to off), causing respawn-pane
to fail with "can't find pane" error.
Fix: Set remain-on-exit=on before killing processes, so the pane survives
process death and can be respawned. This restores tmux session reuse on
handoffs.
Changes:
- Add SetRemainOnExit method to tmux package
- Call SetRemainOnExit(true) before KillPaneProcesses in:
- Local handoff (runHandoff)
- Remote handoff (handoffRemoteSession)
- Mayor attach respawn (runMayorAttach)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
36c7222d5b