feat: Add support for MQL file extensions (.mq4, .mq5, .mqh)

[roomote]

This PR attempts to address Issue #9345 by adding support for MetaQuotes Language (MQL) file extensions.

Summary

Added support for MQL file extensions (.mq4, .mq5, .mqh) to enable indexing of MetaTrader trading strategies, expert advisors, and libraries.

Changes

• Added MQL extensions (.mq4, .mq5, .mqh) to the tree-sitter extensions list in src/services/tree-sitter/index.ts
• Added MQL extensions to the fallback chunking list in src/services/code-index/shared/supported-extensions.ts
• Added comprehensive tests for MQL file handling in src/services/code-index/processors/__tests__/parser.vb.spec.ts

Testing

All tests pass successfully:

• Unit tests for MQL file parsing
• Fallback chunking verification
• Linting and type checking pass

Impact

This change enables Roo Code to properly index and analyze MQL files without crashes, using the fallback chunking strategy similar to how Scala and Swift files are handled.

Feedback and guidance are welcome!

Fixes #9345

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Important

Adds support for MQL file extensions (.mq4, .mq5, .mqh) to enable indexing and analysis using fallback chunking.

• Behavior:
  • Adds support for MQL file extensions (.mq4, .mq5, .mqh) in index.ts for tree-sitter parsing.
  • Updates supported-extensions.ts to include MQL extensions in the fallback chunking list.
  • Enables Roo Code to index and analyze MQL files using fallback chunking.
• Testing:
  • Adds tests for MQL file handling in parser.vb.spec.ts to verify fallback chunking for .mq4, .mq5, and .mqh files.
  • Tests ensure fallback chunking is applied and file content is correctly processed.
• Misc:
  • Fixes [ENHANCEMENT] Add support for MQL file extensions (.mq4, .mq5, .mqh) #9345 by addressing the need for MQL file support.

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[roomote]

Rooviewer   See task on Roo Cloud

Review complete. No issues found.

The implementation correctly adds MQL file support using fallback chunking, following the established pattern for languages without tree-sitter parsers (like VB.NET, Scala, and Swift). All changes are properly tested and consistent with the codebase architecture.

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