ci(sync): remove hardcoded assignee/reviewer fallback

[is0692vs]

Summary

• remove hardcoded is0692vs fallback for sync PR assignees/reviewers
• keep values driven by repository variables (or empty)

Why

Follow-up CodeRabbit review on PR #345 requested that sync PR assignee/reviewer defaults not be tied to a fixed username.

Greptile Summary

このPRは、sync PRの自動生成時に SYNC_PR_ASSIGNEES および SYNC_PR_REVIEWERS のフォールバック値としてハードコードされていたユーザー名 is0692vs を削除し、空文字列 '' へ変更します。PR #345 に対する CodeRabbit のレビュー指摘を受けたフォローアップです。

• .github/workflows/sync-main-to-staging.yml の SYNC_PR_ASSIGNEES と SYNC_PR_REVIEWERS のフォールバックを 'is0692vs' → '' に変更
• ラベルのフォールバック (sync,automated) は汎用的なため引き続き維持
• sync-main-to-staging.sh 内の parse_csv_values 関数は空文字列を正しく処理するため、スクリプト側の変更は不要
• リポジトリ変数 (vars.SYNC_PR_ASSIGNEES / vars.SYNC_PR_REVIEWERS) が設定されていない場合、assignee・reviewer なしで PR が作成される

Confidence Score: 5/5

変更は最小限かつ安全で、マージに問題なし。

ハードコードされたユーザー名を空文字列へ置き換えるだけのシンプルな1行変更が2箇所。シェルスクリプト側の空値ハンドリング（parse_csv_values）も適切に実装されており、P1以上の問題は見当たらない。

特になし。

Important Files Changed

Filename	Overview
.github/workflows/sync-main-to-staging.yml	ハードコードされた is0692vs フォールバックを削除し空文字列に変更。スクリプトの動作に影響なし。

Sequence Diagram

sequenceDiagram
    participant GH as GitHub Actions
    participant WF as sync-main-to-staging.yml
    participant SH as sync-main-to-staging.sh
    participant API as GitHub API

    GH->>WF: push to main / workflow_dispatch
    WF->>WF: 環境変数を設定<br/>SYNC_PR_ASSIGNEES = vars.SYNC_PR_ASSIGNEES \|\| ''<br/>SYNC_PR_REVIEWERS = vars.SYNC_PR_REVIEWERS \|\| ''
    WF->>SH: bash スクリプト実行
    SH->>API: 既存 PR を確認
    alt 既存 PR なし かつ コミット差分あり
        SH->>API: gh pr create<br/>(変数が空の場合 --assignee / --reviewer はスキップ)
    else 既存 PR あり または 差分なし
        SH-->>GH: exit 0
    end

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
open-shelf	Ignored		Apr 7, 2026 8:26am

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[codspeed-hq]

Merging this PR will not alter performance

✅ 2 untouched benchmarks
⏩ 15 skipped benchmarks¹

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_{Comparing fix/staging-sync-pr-vars-default (a5538a9) with staging (6d42ba1)}

Footnotes

1. 15 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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