KillSession was leaving orphaned Claude/node processes because pgrep -P
only finds direct children. Processes that reparent to init (PID 1) were
missed.
Changes:
- Kill entire process group first using kill -TERM/-KILL -<pgid>
- Add getProcessGroupID() and getProcessGroupMembers() helpers
- Update KillSessionWithProcesses, KillSessionWithProcessesExcluding,
and KillPaneProcesses to use process group killing
- Fix EnsureSessionFresh to use KillSessionWithProcesses instead of
basic KillSession
Fixes: gt-w1dcvq
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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