⚡ Bolt: [성능 개선] O(1) 메모리로 코드 변경 횟수 계산 최적화

[seonghobae]

💡 What: section_harmony.py에서 코드 변경 횟수를 계산할 때 발생하던 zip(..., ...[1:]) 중간 리스트 할당을 제거하고, 순회 도중 이전 코드를 추적하여 O(1) 메모리로 최적화했습니다.
🎯 Why: 각 구간(section) 분석 시 불필요한 리스트 할당 및 가비지 컬렉션(GC) 비용을 절약하여 성능을 개선합니다.
📊 Impact: 코드 분석 간 메모리 할당 및 O(N) 리스트 복사 과정을 절감합니다.
🔬 Measurement: test_section_harmony.py 성공 확인 및 정적 타입 체크 통과 확인.

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PR created automatically by Jules for task 6384331238232907743 started by @seonghobae

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Reviewing files that changed from the base of the PR and between acdbea6 and 49f2d35.

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📒 Files selected for processing (3)

• .jules/bolt.md
• patch.diff
• services/analysis-engine/src/bandscope_analysis/chords/section_harmony.py

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[seonghobae]

Closing as a true duplicate of #834 based on the current diffs, not title similarity. Both PRs replace the same overlapping_chords accumulation/zip(..., overlapping_chords[1:]) change count in _summarize_one_section with a rolling previous_chord counter. #834 is the cleaner canonical lane: its exact current diff is limited to services/analysis-engine/src/bandscope_analysis/chords/section_harmony.py, whereas this PR also carries unrelated .jules/bolt.md, package-lock.json, and patch.diff changes. Preserve #834 for review and exact-head gating; no checks or reviews from this PR transfer to #834.

[google-labs-jules]

Closing as a true duplicate of #834 based on the current diffs, not title similarity. Both PRs replace the same overlapping_chords accumulation/zip(..., overlapping_chords[1:]) change count in _summarize_one_section with a rolling previous_chord counter. #834 is the cleaner canonical lane: its exact current diff is limited to services/analysis-engine/src/bandscope_analysis/chords/section_harmony.py, whereas this PR also carries unrelated .jules/bolt.md, package-lock.json, and patch.diff changes. Preserve #834 for review and exact-head gating; no checks or reviews from this PR transfer to #834.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.