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Colby Mchenry
576149e062
Belt-and-suspenders follow-up to #855. Any non-yielding sync loop on the main thread wedges the event loop, and nothing running on that loop (timers, signal handlers, PPID watchdog) can recover it — only another thread can. A tiny worker thread (in the detached daemon + direct modes) watches a shared-memory heartbeat the main thread bumps each event-loop turn; if it stops advancing across enough consecutive checks (~CODEGRAPH_WATCHDOG_TIMEOUT_MS, default 60s) the worker SIGKILLs the process so a fresh daemon starts on the next connection. Counts consecutive stale checks (not wall-clock) so it's immune to clock jumps / sleep; tuned never to fire on real work; opt out with CODEGRAPH_NO_WATCHDOG=1.