🔥 remove: drop unity command alias

[bigdra50]

Closes #119

Summary

• Remove unity entrypoint from [project.scripts] because it collides with the official Unity Hub CLI on PATH
• Keep unity-cli (canonical) and u (short alias)
• Update README examples (EN/JP) to drop the unity state line

Breaking change

Scripts invoking unity ... must switch to u ... or unity-cli .... Worth highlighting in the next release notes.

Test plan

• uv tool install . and confirm only unity-cli / u / unity-relay are exposed (no unity)
• u state / unity-cli state still work
• On a machine with Unity Hub installed, which unity resolves to the official Unity Hub CLI (no shadowing)

Summary by CodeRabbit

• ドキュメント
  • CLIコマンドの使用例を更新し、state コマンドの実行方法を unity-cli state（フルネーム）と u state（短縮形）に整理しました。従来の別の実行方法は削除されました。

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e1c0e2e8-4262-4ebb-9734-4359df262da8

📥 Commits

Reviewing files that changed from the base of the PR and between 337faff and f3619a9.

📒 Files selected for processing (3)

• README.jp.md
• README.md
• pyproject.toml

💤 Files with no reviewable changes (1)

• pyproject.toml

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📝 Walkthrough

Walkthrough

このPRは、公式の Unity Hub CLI との命名競合を解決するため、unity コマンドエイリアスを削除します。pyproject.toml のスクリプトエントリーポイントを unity-cli に変更し、ドキュメント（日本語版・英語版）の利用例を unity-cli と u の 2 つに統一します。

Changes

CLI コマンド エイリアス統一

Layer / File(s)	Summary
スクリプト エントリーポイント pyproject.toml	[project.scripts] の unity エイリアスを unity-cli に変更。他の既存エントリー（u、unity-relay）は変更なし。
ドキュメント更新 README.md, README.jp.md	インストール手順のCLIコマンド例を unity-cli state と u state に統一。unity state の記載を削除。

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• bigdra50/unity-cli#117: Both PRs modify CLI executable naming conventions; this PR removes the unity alias conflict while the linked PR similarly addresses executable name references.

Poem

🐇 unity さらば、争いなし
unity-cli と u で道は清し
スクリプトとドキュメント、心を合わせ
公式CLI とともに調和する
競合消えて、ユーザー笑顔 ✨

🚥 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	PR タイトルは unity コマンドエイリアスの削除という主要な変更を明確に要約しており、変更内容と一致しています。
Linked Issues check	✅ Passed	PR はリンク済みの issue #119 のすべての要件を満たしています：pyproject.toml から unity エントリポイントを削除、README.md/README.jp.md から unity state の例を削除、unity-cli と u は保持。
Out of Scope Changes check	✅ Passed	すべての変更が issue #119 の範囲内です：pyproject.toml のスクリプトエントリポイント修正と、両言語の README ドキュメント更新のみが含まれています。
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
• Commit unit tests in branch feat/remove-unity-alias-119

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