The /model picker's remote catalogs (curated manifest, OpenRouter live
filter, Nous Portal recommendations) only refreshed when someone opened
the picker on a stale cache, with a 1h TTL. A delisted model (tencent/hy3:free
after the free promo ended) or a newly published one could sit stale for
an hour after the manifest deploy, and indefinitely in a gateway nobody
opened /model in.
- model_catalog.ttl_minutes: 20 replaces ttl_hours: 1 as the default;
an explicitly set legacy ttl_hours is still honoured.
- model_catalog.refresh_catalogs() force-refreshes all three sources to
disk; refresh_interval_seconds() exposes the cadence.
- Gateway spawns a supervised _model_catalog_refresh_watcher that calls
it off-thread every TTL window, so every surface on the machine reads
a cache no older than 20 minutes.
- Config migration v39→v40 drops the old ttl_hours: 1 default only.
- Docs: reference/model-catalog.md updated.
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