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## What changed - Add the built-in `amazon-bedrock-runtime` provider for regional `bedrock-runtime` OpenAI-compatible endpoints. - Use endpoint-specific SigV4 service configuration while preserving bearer token auth and per-provider AWS profile, region, and transport overrides. - Provide global and US cross-region GPT-5.6 model variants, prefer global routing for fallback and background tasks, and disable unsupported web search. ## Testing - Cover provider configuration and capabilities, endpoint and auth selection, runtime catalog ordering, model fallback, and web search omission. GitOrigin-RevId: d158ab74a5768e1b4c61063365a0c06735313322