revert(perf): retire unmeasured safe_source_size micro-optimization

[seonghobae]

최종 판정

이 PR의 유효 변경은 safe_source_size()의 Path(source).stat().st_size를 os.stat(source).st_size로 바꾸고 이를 성능 개선으로 문서화하는 것이었습니다. 단위 테스트 통과는 의미 동등성 근거일 뿐이며, PR에 적힌 3–5배 수치는 representative/right-cleared product workload의 end-to-end latency, p95, allocation/heap·GC 또는 buyer-visible 효과를 입증하지 못했습니다.

따라서 측정되지 않은 micro-optimization을 제품 변경으로 유지하지 않습니다. protected main@47c6fd27de13b0da37a7db64697b869941909351의 media_shrinker.py, CHANGELOG.md, .jules/bolt.md blob을 ordinary non-force descendant 816ee1ffc92f27553e2b3481a6c93f3bd656bfdb에서 정확히 복원했습니다.

Fresh compare 결과는 ahead_by=6, behind_by=0, files=[]입니다. 즉 현재 branch에는 protected base 대비 semantic/test/fixture/contract/evidence delta가 남아 있지 않습니다. 이 확인을 근거로 no-valid-delta 예외로 unmerged Close합니다.

동일 최적화를 다시 제안하려면 실제 safe_source_size 호출 분포를 반영한 right-cleared workload에서 protected base와 semantic equivalence를 확인하고, 동일 Python/OS/filesystem/hardware 조건의 median·p95 wall time, CPU, allocation/heap·GC와 batch-level end-to-end 영향까지 함께 제시해야 합니다. noise 수준이면 제품 변경으로 채택하지 않습니다.

Force push, destructive rebase, gate weakening, self-approval, synthetic status 또는 no-op retrigger는 사용하지 않았습니다.

[google-labs-jules]

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[coderabbitai]

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: 6336f009-53ae-4af1-812a-f0eacd908f72

📥 Commits

Reviewing files that changed from the base of the PR and between 47c6fd2 and fada803.

📒 Files selected for processing (3)

• .jules/bolt.md
• CHANGELOG.md
• media_shrinker.py

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📝 Walkthrough

Walkthrough

safe_source_size가 Path.stat() 대신 os.stat()을 사용하도록 변경되었습니다. 기존 OSError 예외 처리는 유지되었습니다. 변경 사항과 성능 학습 내용이 문서에 기록되었습니다.

Changes

파일 크기 조회 최적화

Layer / File(s)	Summary
safe_source_size 조회 방식 변경 media_shrinker.py, CHANGELOG.md, .jules/bolt.md	safe_source_size가 os.stat(source).st_size를 사용합니다. OSError 발생 시 0을 반환하는 기존 동작은 유지됩니다. 변경 내용과 os.stat() 성능 측정 결과가 문서에 추가되었습니다.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 816ee

The optimization introduces no confirmed runtime or merge-blocking risk.

🚥 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	제목은 safe_source_size의 파일 크기 조회 성능 최적화라는 주요 변경 사항을 정확히 설명합니다. 변경 대상 함수와 최적화 목적이 명확합니다.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (2 skipped: 2 …
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt/optimize-safe-source-size-6950287957220464868

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