Release v0.4.0

[herring101]

Summary\n* ✨ outline モード 追加\n* ライブラリ構成を分割（gather.rs / outline.rs ...）\n* README 更新 ほか\n\n📝 CHANGELOG 詳細はファイル参照

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 75.77093% with 55 lines in your changes missing coverage. Please review.

Project coverage is 81.69%. Comparing base (cad3f36) to head (677dc33).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/gather.rs	66.96%	37 Missing ⚠️
src/outline/mod.rs	77.50%	9 Missing ⚠️
src/outline/rust.rs	82.92%	7 Missing ⚠️
src/args.rs	91.30%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   81.56%   81.69%   +0.13%     
==========================================
  Files          13       16       +3     
  Lines         868      978     +110     
==========================================
+ Hits          708      799      +91     
- Misses        160      179      +19     

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