- fix(vertex): prefer live model discovery for OAuth, Service Account, and service-account-bound authorization-key credentials while falling back cleanly to the Gemini-only Express catalog for standard API keys. Model Garden resources now route by publisher protocol: Claude and Mistral use their native
rawPredictAPIs, and Grok plus current or future open MaaS publishers use Vertex's OpenAI-compatible endpoint with normalized request IDs such asxai/grok-4.6.