Codex regression gate found two real issues on the first cut:
1. extra_models bucket: a provider's advertised ids can be split across the
catalog's 'models' (visible) and 'extra_models' (picker overflow) buckets.
Reading only 'models' could miss a bare id that overflowed, leaving the
#433 stale prefix unstripped. _endpoint_advertised_model_ids now unions
both buckets.
2. Profile isolation (profiles are islands): _available_models_cache is a
process global, so a concurrently-active foreign profile could publish the
snapshot a different profile then reads for provenance — potentially
stripping an advertised full id against another profile's catalog. The
accessor now rejects the snapshot unless its published source fingerprint
(whose config_yaml axis is the profile-specific config path) matches the
current runtime fingerprint; any mismatch fails safe to verbatim preserve.
Adds tests: extra_models-counts-as-advertised (#433 via overflow bucket) and
foreign-profile-catalog-preserves-verbatim (isolation fail-safe). Test helpers
now stamp the source fingerprint exactly as the real publish sites do.
nesquena-hermes
0bdf555779