fix: remove ghost reviewer records when reviewers are removed

[coji]

Summary

• reviewer が全員 approve 済み等で reviewRequests から外れた場合、pull_request_reviewers テーブルの古いレコードが削除されずに残り続けるバグを修正
• buildPullRequests で reviewer が 0 人でも常にエントリを emit し、batchReplacePullRequestReviewers の DELETE が走るようにした

Background

全員 APPROVED 済みで GitHub API の reviewRequests が空なのに、DB にゴーストレコードが残っているケースを発見。表示上は requested_at IS NOT NULL フィルタで影響なかったが、データの正確性を担保するために修正。

Test plan

• 既存テスト 208 件通過
• reviewer 0 人のケースのテスト追加
• recalculate 実行後にゴーストレコードが消えることを確認

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 95d6e81b-bba4-4443-809a-1a68430c7427

📥 Commits

Reviewing files that changed from the base of the PR and between 988f80f and caed4e8.

📒 Files selected for processing (2)

• batch/github/__tests__/buildPullRequests-filter.test.ts
• batch/github/pullrequest.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ghost-reviewer-records

📝 Coding Plan

• Generate coding plan for human review comments

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