⚡ Bolt: [성능 개선] opencode_review_approve_gate.sh에서 서브프로세스(git diff) 반복 호출 병목 최적화

[seonghobae]

💡 What:
scripts/ci/opencode_review_approve_gate.sh 파일에 포함된 내장 Python 스크립트에서 changed_new_lines 함수를 @functools.cache로 메모이제이션하도록 최적화했습니다. 함수의 반환형도 set에서 frozenset으로 변경하여 캐시가 안전하고 올바르게 동작하도록 수정했습니다.

🎯 Why:
기존 코드에서는 하나의 파일에서 여러 리뷰 코멘트(finding)가 발생할 경우, 코멘트 개수만큼 중복해서 git diff 명령어를 서브프로세스로 호출(N+1 병목)하고 있었습니다. 서브프로세스 생성은 I/O 대기를 유발하는 무거운 연산이므로, 이를 캐시하여 불필요한 연산을 제거해야 했습니다.

📊 Impact:
같은 파일에 여러 finding이 있는 경우 git diff를 단 1회만 호출하게 되므로, I/O 오버헤드와 서브프로세스 생성 비용을 크게 절감할 수 있습니다. (서브프로세스 호출이 O(N)에서 O(1)로 단축됩니다)

🔬 Measurement:
변경된 스크립트의 문법과 타입이 올바른지 확인하기 위해 mypy 검사와 100% 코드 커버리지를 통과하는 pytest 단위 테스트를 모두 성공적으로 수행하여 안정성을 검증했습니다.

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PR created automatically by Jules for task 9756304325856655693 started by @seonghobae

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[opencode-agent]

Pull request overview

OpenCode model providers were unavailable for this same-head run, but this PR is limited to the central review-process repair surface and the current-head evidence is clean.

Findings

No blocking findings.

Evidence

• Result: APPROVE
• Reason: central review-process evidence fallback after model provider unavailability; coverage, docstring, peer GitHub Checks, code-scanning alerts, mergeability, and review threads were clear for current head.
• Scope: central OpenCode/Strix review-process
• Changed files: 2
• Model-pool outcome: exhausted
• Head SHA: 2e075b9cddfad4491b24fd051dd813540c8039f6
• Workflow run: 29199461852
• Workflow attempt: 2

This fallback is limited to central review-process self-repair and does not apply to application source, dependency manifest, lockfile, generated artifact, or documentation-only PRs.