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## Summary Amazon Bedrock should expose GPT-5.5 alongside GPT-5.4, and the Bedrock GPT entries should stay aligned with the canonical bundled OpenAI model metadata instead of carrying a separate hand-written copy that can drift over time. This change will be merged when the model is online. This change: - Adds the Bedrock Mantle model id for `openai.gpt-5.5`. - Builds the Bedrock GPT-5.5 and GPT-5.4 catalog entries from the bundled OpenAI model catalog, then overrides the Bedrock-facing slug, explicit priority, and Bedrock-specific context windows. - Hardcodes both `context_window` and `max_context_window` to `272000` for Bedrock GPT-5.5 and GPT-5.4. - Keeps `openai.gpt-5.5` as the default Bedrock model ahead of `openai.gpt-5.4` and the Bedrock OSS models.