docs: 作業開始時に main からブランチを切るルールを CLAUDE.md に追加

[yusuke0610]

概要

作業開始時のブランチ運用を CLAUDE.md にデフォルトルールとして明文化する。

変更内容

• 「作業開始時のブランチ運用（デフォルト）」セクションを新設
  • 新しい作業に着手するときは、合言葉や明示指示を待たず最初に origin/main 起点で feature ブランチを切ることをデフォルト挙動として明記
  • ブランチ命名（英語 kebab-case + feat//fix//docs/ 等）、コミットを伴わない調査のみの例外も記載
• 既存 feature ブランチに差分がある場合のルールを追加
  • 差分が無ければ継続、差分（未コミット変更 or main より進んだコミット）がある場合は勝手に切り直さず、main から切り直すかユーザーに相談する
• commit/PR フローの stage 行を整合
  • ブランチ作成は本来「作業開始時」に行う位置づけへ修正（stage は切り損ねた場合の保険）

補足

• 変更は .claude/CLAUDE.md のみ（ガイドライン markdown）。lint/test/build 対象外のため make ci はスキップ。

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added guidelines for creating feature branches from the main branch, including handling existing feature branches and naming conventions.
  • Revised branch operation workflow instructions to ensure consistency with default branching practices.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 9c8b0912-197d-400e-8deb-e30ec988e4c8

📥 Commits

Reviewing files that changed from the base of the PR and between 38a6288 and 04039f7.

📒 Files selected for processing (1)

• .claude/CLAUDE.md

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📝 Walkthrough

Walkthrough

The PR updates development workflow documentation in .claude/CLAUDE.md by adding a new section on default branch operations when starting work—including fetching main, creating feature branches from origin/main, and handling rules for existing branches—and aligns the stage guidance to reference this procedure.

Changes

Development Workflow Guidelines

Layer / File(s)	Summary
Default branch operation and stage guidance .claude/CLAUDE.md	Added "作業開始時のブランチ運用（デフォルト）" section specifying feature branch creation from origin/main, rules for continuing or restarting on existing branches with local changes, branch naming conventions, and investigation-only exceptions. Updated "コミット / PR フロー" stage guidance to reference the new default operation and align decision-needed presentation logic.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

📚 A rabbit hops through workflow tales,
Branching guidance now unveils—
From main to features, clear and neat,
Default operations, oh so sweet! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title accurately reflects the main change: adding branch operation rules for starting work from 'main' to CLAUDE.md documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/branch-strategy

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