feat: add signature source

[toaction]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @toaction, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant improvement to how function signatures are represented and retrieved within the system. By moving from a simple string representation to a more structured Signature object that includes the source of the signature, the change enhances the accuracy and traceability of function metadata. This refactoring ensures that the system can differentiate between signatures obtained from various methods (like Python's inspect module, docstrings, or default paradigms), leading to more robust and informative code generation or analysis.

Highlights

• Enhanced Signature Representation: The system now stores not only the string representation of a function's signature but also its origin (e.g., from Python's inspect module, docstrings, or a default paradigm).
• New Data Structures: Introduced a Signature struct and a SigSource enum in symbol/symbol.go to precisely capture signature details and their source.
• Improved Signature Retrieval: The getSignature function has been refactored to return the new Signature struct along with an error, and includes logic to populate the Source field based on the signature's origin.
• Type Safety and Clarity: Updated the Symbol struct and related code to use the new Signature type, improving type safety and clarity in handling function signatures throughout the codebase.

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[gemini-code-assist]

Code Review

This pull request introduces a Signature struct to store not just the signature string but also its source (e.g., from inspect or doc). This is a great enhancement for traceability and debugging. The changes in pydump and pygen are consistent with this new structure. I have a couple of suggestions to improve robustness and the readability of the generated JSON output.

[niupilot]

Code Review Summary

Overall Assessment: Good quality implementation with a well-structured approach to signature source tracking. The change from string signatures to structured objects improves type safety and maintainability.

Key Issues to Address:

• Critical: Missing Go documentation for new public types (SigSource, Signature)
• High: Update design documentation to reflect API changes
• Medium: Add function documentation for signature extraction logic

Performance Impact: Minimal (+8 bytes per Symbol) with good benefits for debugging and future optimization.

Security: No significant vulnerabilities found. Clean implementation with proper error handling.

The structured signature approach is a solid improvement that will make future enhancements easier.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 44.46%. Comparing base (f84dd79) to head (aa4e2be).

Files with missing lines	Patch %	Lines
tool/pygen/genfunc.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #41   +/-   ##
=======================================
  Coverage   44.46%   44.46%           
=======================================
  Files           6        6           
  Lines         452      452           
=======================================
  Hits          201      201           
  Misses        232      232           
  Partials       19       19           

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