chore: setup pre-commit

[miyakoshi-3854]

close #85

Summary

タイトル通り

Changes

install pre-commit
add config file

Notes

ruff が v0.15.1 の理由は、下記記事にそろえた方がいいと書いてあったから。
別に ruff を v0.15.5 にしてもいいと思う。

参照: 2次ソース

動作テスト

meshiban=chore-setup-pre-commit on  chore/setup-pre-commit [!+] is 📦 v0.1.0 via 🐍 v3.12.12 
❯ uv run pre-commit run end-of-file-fixer
[INFO] Initializing environment for https://github.com/pre-commit/pre-commit-hooks.
[INFO] Initializing environment for https://github.com/astral-sh/ruff-pre-commit.
[INFO] Installing environment for https://github.com/pre-commit/pre-commit-hooks.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
fix end of files.........................................................Failed
- hook id: end-of-file-fixer
- exit code: 1
- files were modified by this hook

Fixing .pre-commit-config.yaml


meshiban=chore-setup-pre-commit on  chore/setup-pre-commit [!+] is 📦 v0.1.0 via 🐍 v3.12.12 took 6s 
❯ uv run pre-commit run trailing-whitespace
trim trailing whitespace.................................................Failed
- hook id: trailing-whitespace
- exit code: 1
- files were modified by this hook

Fixing .pre-commit-config.yaml
Fixing src/main.py

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: b0888ca8-d84e-4e3c-8bc5-49450dae0081

📥 Commits

Reviewing files that changed from the base of the PR and between b4aab49 and ce245be.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• .pre-commit-config.yaml
• pyproject.toml

---

📝 Walkthrough

Walkthrough

プロジェクトに pre-commit フレームワークを導入し、自動フォーマット・リント検証を設定する。.pre-commit-config.yaml で pre-commit-hooks と ruff-pre-commit を登録し、pyproject.toml に dev 依存として pre-commit パッケージを追加。

Changes

Cohort / File(s)	Summary
Pre-commit Configuration .pre-commit-config.yaml	Pre-commit フレームワークを設定。end-of-file-fixer、trailing-whitespace、check-merge-conflict、detect-private-key、check-yaml、check-toml、check-json の各フックと、ruff-check (--fix オプション付き)、ruff-format を登録。
Development Dependencies pyproject.toml	dev 依存グループに pre-commit>=4.5.1 を追加。

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Pre-commit の魔法が舞い込み
フォーマット忘れもさよならだ
Ruff と hooks が見張り役
コミット前に きれいに整う
🌟 自動の手が優しく
コードの美しさ守るため

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	タイトルは pull request の主要な変更内容（pre-commit の設定）を簡潔に反映しており、明確で説明的です。
Description check	✅ Passed	説明は必須セクション（Summary、Changes、Notes）をすべて含み、構造化されており十分完成しています。
Linked Issues check	✅ Passed	変更内容は issue #85 の「pre-commit 導入してフォーマット忘れを無くす」という要件を満たしており、設定ファイルの追加と依存関係の導入が適切に実装されています。
Out of Scope Changes check	✅ Passed	すべての変更は issue #85 の要件に関連し、pre-commit の導入という定義された範囲内に収まっています。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/setup-pre-commit

---

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[nkoji21]