Sliding window fix

[cte]

Description

Fix truncation logic for models with maxTokens values above 40K (like Claude 3.7 Sonnet).

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Checklist:

• My code follows the patterns of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Additional context

Related Issues

Reviewers

---

Important

Fixes sliding window logic in truncateConversation functions and adds tests for message truncation and token threshold handling.

• Behavior:
  • Fixes sliding window logic in truncateConversation() and truncateConversationIfNeeded() in index.ts to correctly handle message truncation based on fraction and model context.
  • Adjusts buffer calculation in getMaxTokensForPromptCachingModels() and getMaxTokensForNonPromptCachingModels() to use modelInfo.maxTokens if available.
• Tests:
  • Adds test cases in sliding-window.test.ts for truncateConversation() to verify message retention and removal logic.
  • Adds test cases for truncateConversationIfNeeded() to check token threshold handling for different model configurations.
• Misc:
  • Adds handling for anthropic/claude-3.7-sonnet:beta model ID in ClineProvider.ts.

^{This description was created by for 6245aa7. It will automatically update as commits are pushed.}

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Latest commit: 6245aa7

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[ellipsis-dev]

Consider adding tests for empty messages array to ensure truncate functions handle such edge cases gracefully.