Some catalog endpoints (OpenCode Zen, etc.) sit behind a WAF that
returns 403 for the default Python-urllib/<ver> User-Agent. The
generic profile-based live fetch in providers/base.py was silently
failing for any such provider — falling through to the static catalog
and missing newly-launched models.
Set a generic 'hermes-cli/<version>' UA on the catalog probe so every
api_key provider profile benefits. Verified live against opencode-zen:
before this change, profile.fetch_models() raised HTTP 403; after, it
returns 42 models including gpt-5.5, gpt-5.5-pro, kimi-k2.6, glm-5.1
and the *-free variants the static catalog doesn't list.
Also strip the now-stale comment in validate_requested_model() claiming
opencode-zen's /models returns 404 against the HTML marketing site —
the API endpoint at /zen/v1/models returns 200 with valid JSON.
Surfaced by #2651 (@aashizpoudel) — fixes the same user-facing gap
their PR targeted, applied at the right layer so all api_key provider
profiles get live catalogs through the same code path.
Co-authored-by: Aashish Poudel <mr.aashiz@gmail.com>
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