… provider)
    
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## Summary by cubic
Enables 1M-token context for Anthropic Claude 4 Sonnet and marks AWS
Bedrock as a secondary provider. Adds the required Anthropic beta header
and updates model metadata and pricing indicator.

- **New Features**
- Send header anthropic-beta: context-1m-2025-08-07 when using the
Anthropic provider.
- Update Claude 4 Sonnet configs: contextWindow to 1,000,000; add cost
warning; increase pricing tier to 5 (applies to Anthropic and Bedrock
model IDs).
  - Set AWS Bedrock as a secondary provider.

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