new_health_map seeds every library as Online, and the watcher's tick
loop sleeps WATCH_QUICK_INTERVAL_SECONDS (default 60s) before its
first probe — meaning /libraries reported the optimistic default for
up to a minute after boot, even when a share was clearly unmounted.
Run the same refresh_health pass once at the top of the watcher
thread before entering the sleep loop. /libraries is then truthful
within milliseconds of the watcher thread starting (effectively from
the first HTTP request, since the watcher spawns well before the
server binds).
The per-tick gate inside the loop is unchanged.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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