Three medium vision-manager findings:
1. **`vision_running()` conflated "container absent" with "inspect
failed".** A transient docker-socket-proxy hiccup made the manager
think vision had stopped, which reset `up_for`/`idle_for` and
defeated MAX_UPTIME. Distinguishes: exit 0 → echo true/false;
"No such container" → false; else → ERR (loop skips tick).
2. **`crawl_running()` fail-closed where `analysis_enabled()` fail-opens.**
A psql `ERR` logged a misleading "RAM mutex" line every tick.
Numeric-guard at the call site with a distinct log.
3. **`start_vision` left wedged containers running** on
`START_HEALTH_TIMEOUT` expiry — pinned forever in not-ready state.
Now `stop_vision` so next tick retries from a clean state.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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