capable bebf425ac5 fix(polecat): kill orphaned Claude processes when nuking polecats ...

When polecats are nuked, Claude child processes could survive and become
orphans, leading to memory exhaustion (observed: 142 orphaned processes
consuming ~56GB RAM).

This commit:
1. Increases the SIGTERM→SIGKILL grace period from 100ms to 2s to give
   processes time to clean up gracefully
2. Adds orphan cleanup to `gt polecat nuke` that runs after session
   termination to catch any processes that escaped
3. Adds a new `gt cleanup` command for manual orphan removal

The orphan detection uses aggressive tmux session verification to find
ALL Claude processes not in any active session, not just those with
PPID=1.

Fixes: gh-736

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-22 21:43:23 -08:00

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