Support XGoPackage marker alongside legacy GopPackage

[xgopilot]

Summary

This PR enables XGo packages to use either GopPackage or XGoPackage as the marker constant for enabling XGo-specific transformations (e.g., overload processing).

Changes

• doc/z_gop.go: Added XGoPackage constant and updated isGopPackage() function to check for both GopPackage and XGoPackage markers
• cl/outline/outline.go: Updated constant filtering logic to skip both GopPackage and XGoPackage from the outline
• doc/_testdata/: Added regression test cases for XGoPackage marker:
  • xgoOverloadFn/: Tests function overload with XGoPackage marker
  • xgoOverloadMethod/: Tests method overload with XGoPackage marker

Testing

All existing tests pass, including the new test cases that verify the XGoPackage marker works equivalently to GopPackage:

go test ./doc -v

Backward Compatibility

This change maintains full backward compatibility:

• Existing packages using GopPackage continue to work without modification
• New packages can choose to use XGoPackage to align with the XGo branding
• Both markers are treated identically by the compiler and tooling

Fixes #2473

Generated with codeagent

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.33%. Comparing base (064087b) to head (9d2095d).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2474   +/-   ##
=======================================
  Coverage   93.33%   93.33%           
=======================================
  Files          34       34           
  Lines       11608    11608           
=======================================
  Hits        10834    10834           
  Misses        609      609           
  Partials      165      165           

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[aofei]

@codex please take a look at this one.

/gemini you too.

[gemini-code-assist]

Thanks for tagging me, @aofei! I've reviewed the changes in this pull request.

The modifications to cl/outline/outline.go and doc/z_gop.go correctly introduce and handle the XGoPackage marker, aligning perfectly with the PR's objective to support it alongside GopPackage. The addition of new test cases in doc/_testdata/xgoOverloadFn and doc/_testdata/xgoOverloadMethod is also a great way to ensure the new functionality works as expected and maintains backward compatibility.

Overall, the changes are clear, concise, and well-tested. This looks good to merge!

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Chef's kiss.

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[xushiwei]

@xgopilot rename isGopPackage to isXGoPackage

[xgopilot]

✅ Completed: Renamed isGopPackage to isXGoPackage

Successfully renamed the function and all its usages across the codebase:

Files modified:

• doc/z_gop.go:32 - renamed function definition
• doc/z_transform.go:251 - renamed function call
• doc/z_test.go:54-56 - renamed test function TestIsXGoPackage and calls

Verification:

• ✓ All files formatted with go fmt
• ✓ All tests pass (6/6 subtests in TestFromTestdata, including TestIsXGoPackage)
• ✓ Changes committed and pushed to branch

Commit: 9d2095d4

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Job Run | Branch: xgopilot/claude/issue-2473-1760329633