fix: Gemini thought signature validation errors

[daniel-lxs]

Fixes ROO-523

Add safety features to prevent 'Thought signature is not valid' errors when using Gemini models via OpenRouter.

Changes:

• consolidateReasoningDetails(): filter corrupted encrypted blocks and consolidate by index
• sanitizeGeminiMessages(): filter reasoning_details by tool call ID and drop invalid tool calls/results

Adapted from cline/cline#8214

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Important

Adds functions to filter and consolidate reasoning details for Gemini models, ensuring valid tool calls and reasoning details are processed correctly.

• Behavior:
  • sanitizeGeminiMessages(): Filters reasoning_details by tool call ID, drops invalid tool calls/results in openrouter.ts.
  • consolidateReasoningDetails(): Filters corrupted encrypted blocks, consolidates by index in openrouter.ts.
• Functions:
  • Adds sanitizeGeminiMessages and consolidateReasoningDetails to openai-format.ts.
• Tests:
  • Adds tests for sanitizeGeminiMessages and consolidateReasoningDetails in openai-format.spec.ts.

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[roomote]

Rooviewer   See task on Roo Cloud

Review complete. No issues found.

The implementation correctly adds safety features to prevent 'Thought signature is not valid' errors when using Gemini models via OpenRouter. The code properly handles:

• Filtering corrupted encrypted blocks
• Consolidating reasoning_details by index
• Sanitizing messages by filtering reasoning_details by tool call ID
• Dropping invalid tool calls/results

Test coverage is comprehensive.

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