🧹 코드 건강성 개선: PR 헤드 검증 로직 중복 제거

[seonghobae]

🎯 What: pr_review_merge_scheduler.py 파일의 dismiss_stale_opencode_approvals, dismiss_stale_opencode_change_requests, restamp_pr_head_for_last_push_approval 함수에 중복되어 있던 PR 헤드 검증 및 GitHub API 호출 로직을 require_unmodified_pr_head라는 헬퍼 함수로 추출했습니다.
💡 Why: 동일한 코드 블록이 3곳에서 사용되어 코드 길이가 길어지고 유지보수성이 떨어졌습니다. 헬퍼 함수를 통해 코드 중복을 제거하고 가독성을 높였습니다.
✅ Verification: 단위 테스트와 coverage 검사를 모두 통과했으며, interrogate로 docstring 커버리지 100%를 유지함을 확인했습니다.
✨ Result: pr_review_merge_scheduler.py 내 복잡한 함수의 코드 크기가 줄어들고 오류 메시지 포맷이 통일되어 전체적인 코드 건강성이 향상되었습니다.

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PR created automatically by Jules for task 8856118095832387920 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between 6eb06cd and 0535a8c.

📒 Files selected for processing (3)

• scripts/ci/pr_review_merge_scheduler.py
• tests/test_opencode_existing_approval_gate.py
• tests/test_opencode_security_boundaries.py

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[seonghobae]

RCA/feasibility: closing unmerged as structurally superseded by #828. This refactor extracts repeated live-head validation from the pre-#828 monolithic scheduler and changes tests around that old layout. #828 is the authoritative security repair for scheduler merge authorization and replaces that monolith with an independent-approval policy facade plus _pr_review_merge_scheduler_core.py; head validation/dismissal behavior must be evaluated in that protected architecture, not merged as a parallel old-layout refactor. No distinct current correctness defect is demonstrated here. Reassess duplication only after #828 integrates and exact-head safety/runtime evidence is stable.

[google-labs-jules]

RCA/feasibility: closing unmerged as structurally superseded by #828. This refactor extracts repeated live-head validation from the pre-#828 monolithic scheduler and changes tests around that old layout. #828 is the authoritative security repair for scheduler merge authorization and replaces that monolith with an independent-approval policy facade plus _pr_review_merge_scheduler_core.py; head validation/dismissal behavior must be evaluated in that protected architecture, not merged as a parallel old-layout refactor. No distinct current correctness defect is demonstrated here. Reassess duplication only after #828 integrates and exact-head safety/runtime evidence is stable.

Understood. Acknowledging that this work is structurally superseded by #828 and stopping work on this task.