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b43fbc3884
detectAutopilot treated a lock FILE as proof of life, so a crashed gbrain daemon left a stale lock that wedged every sync forever (observed: a dead pid refused --full indefinitely). Now read the holder pid (bare or JSON body) and check liveness via signal-0: ESRCH=dead → ignore the stale signal and keep checking; EPERM=alive (other user) → active. A stale lock never masks a live autopilot process. Pure decision function — does not delete the file; the caller may clean it. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>