[26] OpenAI-compatible provider configuration

[nrbrd]

Outcome

Operators can configure named OpenAI-compatible instances and public models.

Technical work

API key, base URL, provider name, model construction, startup validation, deterministic transport, aliases, and authenticated discovery.

Acceptance

configured compatible models serve strict unary and streaming scenarios without exposing private configuration.

Dependencies

5. May proceed independently of 23 through 25.