ci: remove obsolete GitHub workflows

[Yusuke4869]

GitHub App (flightdesk/preflight) 導入により不要になった workflow を削除

Summary by CodeRabbit

• 変更
  • PR作成者を自動で担当者に割り当てる機能がなくなりました。
  • PRタイトルの検証と、検証結果に応じたコメントの投稿・削除が行われなくなりました。

[coderabbitai]

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: f2a25050-2f60-4522-b5ae-b1af75539553

📥 Commits

Reviewing files that changed from the base of the PR and between fecd7b8 and d0efb63.

📒 Files selected for processing (2)

• .github/workflows/auto-author-assign.yml
• .github/workflows/semantic-pr-title.yml

💤 Files with no reviewable changes (2)

• .github/workflows/auto-author-assign.yml
• .github/workflows/semantic-pr-title.yml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

📜 Recent review details

⏰ Context from checks skipped due to timeout. (4)

• GitHub Check: static-tests
• GitHub Check: integration-test
• GitHub Check: Validate PR title
• GitHub Check: Assign PR author as assignee

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📝 Walkthrough

Walkthrough

作成者を担当者に割り当てるワークフローと、PRタイトルを検証してコメントを管理するワークフローを削除しました。

Changes

作成者の担当者割り当て

Layer / File(s)	Summary
担当者割り当てワークフローの削除 .github/workflows/auto-author-assign.yml	PRの作成時または再オープン時に、作成者を担当者へ割り当てるワークフローを削除しました。

PRタイトル検証

Layer / File(s)	Summary
PRタイトル検証ワークフローの削除 .github/workflows/semantic-pr-title.yml	PRタイトルの検証、失敗時のコメント投稿、成功時の該当コメント削除を行うワークフローを削除しました。

Priority: ⚪ Not assessed

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to d0efb

No concrete merge-blocking issue is established for the workflow removal. Confirm that the GitHub App provides any title checks and assignment behavior the project still expects.

🚥 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	タイトルは、不要になったGitHub Actionsワークフローの削除という変更内容を正確かつ簡潔に示しています。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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_{うさぎがワークフローの跡を見つけた
担当者を割り当てる仕組みは消え
タイトルを確かめる仕組みも消えた
コメントの行き来もここでおしまい
月の下で静かなリポジトリを見守る}

_{Comment @coderabbitai help to get the list of available commands.}