⚡ Bolt: [성능 개선] 파일 시스템 탐색 최적화

[seonghobae]

💡 What:
src/files.ts의 walkFiles 함수 내 파일 시스템 탐색 로직을 최적화했습니다. 기존에는 readdirSync 호출 후 각 파일마다 statSync를 호출하여 디렉터리 여부를 확인했으나, readdirSync에 { withFileTypes: true } 옵션을 추가하여 추가적인 시스템 호출(stat) 없이 디렉터리 여부를 판단하도록 개선했습니다.

🎯 Why:
수백, 수천 개의 명세 파일(spec markdown)을 재귀적으로 탐색할 때, 각 파일마다 statSync를 호출하면 불필요한 시스템 호출 오버헤드가 발생하여 심각한 병목(bottleneck)이 될 수 있습니다. 이는 성능에 치명적이므로 빠른 I/O를 보장하기 위해 개선이 필요합니다.

📊 Impact:

• 디렉터리 내부 파일마다 발생하던 stat 시스템 호출이 완전히 제거됩니다.
• 대규모 디렉터리 트리 탐색 시 파일 I/O 시간과 메모리 사용량이 현저히 줄어들 것으로 예상됩니다.
• 코드의 간결성을 해치지 않으면서(실제로는 코드가 더 짧아짐) 즉각적인 성능 개선을 달성했습니다.

🔬 Measurement:

• pnpm test와 pnpm typecheck를 실행하여 기존 동작이 완벽하게 유지되는지 확인했습니다.
• 향후 대규모 벤치마크 테스트를 통해 fs.readdirSync(..., { withFileTypes: true }) 적용 전후의 실행 시간을 비교해볼 수 있습니다.

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PR created automatically by Jules for task 5551910338875410331 started by @seonghobae

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