sync.sh now posts a per-machine coord component
(claudetools/git_sync_<MACHINE>) flipped syncing -> idle/degraded around
each run, so the fleet can see who is mid-sync / last sync state. Fully
best-effort: a 3s-capped curl guarded with || true + return 0, emitted
only after the lock is acquired (contention/exit-75 emits nothing), and
finalize captures $? first and returns it so the signal can never change
the sync's real exit code. Reviewed (verified it cannot break sync).
Mike Swanson
f174d1b7fa