dennis 0f633be4b1 fix(zfc): remove PID-based agent liveness detection ...

Replace ProcessExists() checks in witness and refinery managers with
tmux session detection. Agent liveness should be derived from tmux
session state, not PID probing (per ZFC tracking principles).

- Remove util.ProcessExists() from witness/manager.go and refinery/manager.go
- Delete internal/util/process.go and process_test.go (now unused)
- Foreground mode and Stop() now rely solely on tmux HasSession/KillSession

Closes: hq-yxkdr (recentDeaths already removed)
Closes: hq-1sd4o (ProcessExists removed)

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

2026-01-09 22:02:34 -08:00

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