Fix: Robust Sonnet 4.5 detection incl. Bedrock dotted vendor prefixes; avoid reasoning_effort for Sonnet 4.5#11259

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fix/sonnet-4-5-bedrock-normalization

Commits on Oct 6, 2025

llm(model_features): normalize Bedrock region.vendor prefixes and add dot variant for Sonnet 4.5; llm: avoid reasoning_effort for Sonnet 4.5\n\nFix: #11248\n\nCo-authored-by: openhands <openhands@a…
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