preserve(perf): duplicate GrooveMap loop rewrite pending #1170/#1253

[seonghobae]

Preservation / single-writer status

This PR is Open / Draft / mergeable preservation evidence. It must not become a second GrooveMap performance or Score bridge owner.

• Protected base: develop@314ddeae7b775a4957594b599358c8255617eb2e
• Exact current head: 6bf57c0f974cd673022239f1d9419ee34d127640
• Validated semantic preservation head: d8a8d20eca1d1ecea90eb6ae76dd3b51a6d3e5de
• Current live product diff remains the same validated GrooveMap/performance-preservation tree: .jules/bolt.md + apps/desktop/src/features/workspace/GrooveMap.tsx
• Canonical max-offset performance owner: perf(ui): bound GrooveMap max-offset scan overhead #1170 exact 9f4b545401d619e1320f1e8add483e0dcce5b98f
• Shared runtime timing-admission owner: fix(shared): enforce valid transcription timing intervals #1254 exact c21c18ccd630614feee1fef3e0b7e5cf4fdce658
• Canonical Score bridge owner: fix(score): enforce renderer score bridge admission #1190 exact ff0f0c2f84a048685f74b580bcb4663fd759a278
• Canonical formatter owner: repair(ci): format consolidated supply-chain policy test #1176 exact 8fe6b6d99c009527ef0bcba419e6f6debdb23c23

Valid finding and weaker implementation

This branch preserves callback-to-indexed-loop hypotheses in GrooveMap.tsx. The max-offset rewrite is not semantically equivalent to protected Math.max(max, offset) for malformed/non-finite values; canonical #1170 already absorbed the useful finding with a semantics-preserving indexed scan and #1254 separately tightens timing admission. The unique-pitch and pitch-index rewrites remain unprofiled hypotheses; source style alone is not performance evidence.

Intervening owner-boundary repairs

Generated continuation 6cf3307b0c3aa303d2b0d9d98e0c24538ac4e1e6 reintroduced #1176's unrelated Ruff-only formatter delta; ordinary descendant c910add6f317387c84a6aee30b7277df56205f0a removed it.

Later continuation a6c36822007699173637fc7c0e46ca725eb4f9cc crossed into Score bridge ownership with a weaker manual loop, rewrote .jules/bolt.md, and removed the preservation lane's GrooveMap hypotheses. Ordinary descendant 4909f1d92fa3b33f63cecf2bed0c5bbe4f9079d0 restored the validated preservation tree.

Fresh head f49deb36fcc1476c88d6c71ce424ba5c93ae5d6f repeated the same crossing: it admitted any JavaScript number into the Score bridge, copied #1176 formatter source and added unprofiled callback-overhead claims. Ordinary descendant d8a8d20eca1d1ecea90eb6ae76dd3b51a6d3e5de restored the validated tree with history preserved.

Current live 6bf57c0f974cd673022239f1d9419ee34d127640 is seven ordinary commits ahead of d8a8d20..., but fresh compare reports zero file delta. Therefore this movement is source-neutral: it does not change GrooveMap, Score, formatter, test, fixture, or performance semantics and repair progress is 0. Do not manufacture a wake/restack commit merely to chase this ref movement. Predecessor check/review receipts still do not become current-head acceptance simply because the tree is unchanged.

Canonical #1190 subsequently suffered another destructive continuation a7d6f205... that again removed its bounded byte/resource/identity admission and simultaneously crossed into GrooveMap source. That foreign delta was not adopted here or in #1170. #1190 ordinary non-force repair ff0f0c2... restores the validated Score owner tree and leaves GrooveMap ownership with #1170/#1254.

Documentation / claim boundary

.jules/bolt.md is preservation metadata, not a repository-wide performance law. Any canonical adoption must retain semantic equivalence first and establish benefit with representative Electron/Chromium profiling of scripting time, heap/allocation, GC, and buyer-visible interaction latency.

PR-0 / consolidation rule

Do not merge this branch independently. Do not close it merely because #1170/#1254/#1190 are stronger today. Closure is valid only after a verified canonical successor has absorbed every still-valid #1251 semantic/test/evidence delta or explicitly rejected the unmeasured loop hypotheses with evidence, and protected integration makes succession authoritative.

Every source movement invalidates predecessor checks/reviews. Fresh exact-head repository/security/CodeQL evidence and qualifying independent non-author approval are required before any merge disposition.

No self-approval, force-push, destructive rebase, no-op freshness commit, blind rerun, synthetic status, gate weakening, unsupported speedup multiplier, copied #1176 formatter source, or duplicate GrooveMap/Score source ownership.

[google-labs-jules]

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Reviewing files that changed from the base of the PR and between 314ddea and 7486f9d.

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• .jules/bolt.md
• apps/desktop/src/features/workspace/GrooveMap.tsx

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📝 Walkthrough

Walkthrough

GrooveMap의 세 배열 계산을 인덱스 기반 for 루프로 변경했습니다. 계산 결과는 유지됩니다. 배열 순회 비용에 관한 학습 기록도 추가했습니다.

Changes

배열 순회 최적화

Layer / File(s)	Summary
GrooveMap 루프 변경 및 학습 기록 apps/desktop/src/features/workspace/GrooveMap.tsx, .jules/bolt.md	maxTime, uniquePitches, pitchIndexMap 계산을 인덱스 기반 for 루프로 변경했습니다. reduce()와 forEach()의 콜백 오버헤드에 관한 학습 기록을 추가했습니다.

Priority: ⬇️ Low

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

Change: Refactor

Merge Risk: ⚪ Minimal · up to 7486f

검증된 입력 경로에서 변경된 루프의 동작 문제가 확인되지 않아 병합 가능합니다.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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. (1 skipped: 1 …
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	제목은 GrooveMap의 반복문 재작성과 성능 개선을 직접 설명합니다. 변경의 주요 목적과 관련이 있습니다.

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[seonghobae]

Exact-head review for 7486f9dce08c0968f188c85093df97bc901ce098.

The loop rewrite is a plausible micro-optimization, but maxTime is not semantically equivalent for non-finite offsets. Protected base used Math.max(max, n.offset): once an offset is NaN, the reduction becomes NaN. This head uses if (offset > max), so NaN is silently ignored and a finite max is returned. TypeScript's number type does not establish a finite-number runtime invariant, so this changes malformed/edge input behavior unless an upstream admission contract proves offset finite.

Please first decide and encode the domain invariant. If transcription notes must have finite onset/offset, validate that at the owner boundary and add NaN, ±Infinity, negative/duration-inverted fixtures. If this component intentionally owns malformed-data behavior, preserve the prior result/error contract explicitly rather than changing it as a side effect of a performance rewrite.

The performance claim also needs measurement. Replacing reduce/forEach with indexed loops does not by itself prove lower GC or materially faster rendering on the current JS engine. Measure the real GrooveMap buyer path at representative transcription sizes with Chromium/Electron current-head profiling: scripting/main-thread wall time, allocations/heap/GC, median and p95, with identical render output. Keep the change only if the delta survives that measurement; otherwise avoid source churn.

The new source comments restate the implementation rather than a non-obvious contract. If retained, document the measured threshold/engine constraint or the finite-number invariant instead.

Acceptance: realistic non-finite RED or proven upstream invariant → semantic-equivalent minimal loop change → rendered-output differential GREEN → reproducible browser/Electron performance evidence.

[seonghobae]

Current authority update: live head had advanced from validated d8a8d20eca1d1ecea90eb6ae76dd3b51a6d3e5de through another generated Score/GrooveMap crossing to 69743757bc4700e624f7266b171296e7008e11e6. That continuation again entered canonical #1190 Score bridge ownership and displaced this lane's preservation tree. Ordinary descendant 146c87dfd6cf5e1c3a6f8bfd26d4d078ebdda826 uses 6974375... as parent and restores validated tree 4f17ea1a94fe70a7feb3519688c1dfb2411526a1. Branch advanced with force=false; generated history remains ancestry. Canonical owners remain #1190 Score bridge, #1170 max-offset, #1254 shared timing, and #1176 formatter. This PR remains Open/Draft preservation only; predecessor evidence does not transfer.

[google-labs-jules]

Current authority update: live head had advanced from validated d8a8d20eca1d1ecea90eb6ae76dd3b51a6d3e5de through another generated Score/GrooveMap crossing to 69743757bc4700e624f7266b171296e7008e11e6. That continuation again entered canonical #1190 Score bridge ownership and displaced this lane's preservation tree. Ordinary descendant 146c87dfd6cf5e1c3a6f8bfd26d4d078ebdda826 uses 6974375... as parent and restores validated tree 4f17ea1a94fe70a7feb3519688c1dfb2411526a1. Branch advanced with force=false; generated history remains ancestry. Canonical owners remain #1190 Score bridge, #1170 max-offset, #1254 shared timing, and #1176 formatter. This PR remains Open/Draft preservation only; predecessor evidence does not transfer.

Acknowledged. I understand the preservation state and that this PR remains Open/Draft for preservation purposes without transferring predecessor evidence.

[seonghobae]

Current-head authority refresh: branch ref is now b8fd201f1f945464d31a57e34de31c049b66c12a, four ordinary commits ahead of the body-recorded d8a8d20eca1d1ecea90eb6ae76dd3b51a6d3e5de. Fresh compare reports files=[], so the tree/semantic delta is unchanged and repair progress from this movement is 0. Keep Open / Draft; do not manufacture a wake/restack commit or transfer predecessor check/review evidence.

[google-labs-jules]

Current-head authority refresh: branch ref is now b8fd201f1f945464d31a57e34de31c049b66c12a, four ordinary commits ahead of the body-recorded d8a8d20eca1d1ecea90eb6ae76dd3b51a6d3e5de. Fresh compare reports files=[], so the tree/semantic delta is unchanged and repair progress from this movement is 0. Keep Open / Draft; do not manufacture a wake/restack commit or transfer predecessor check/review evidence.

Acknowledged. I understand that the branch reference has advanced, and that the tree/semantic delta remains unchanged. I will keep this PR Open/Draft and will not manufacture a restack commit.

[seonghobae]

Fresh head authority: branch ref is now 3259722ec3723b24b7a0580cf0800d4f32cee76f. Compare from body-listed d8a8d20eca1d1ecea90eb6ae76dd3b51a6d3e5de is ahead by 5 commits with files=[]. This is source-neutral movement; semantic tree is unchanged and repair progress is 0. No wake/restack commit, predecessor-evidence promotion, or owner reassignment is justified.

[google-labs-jules]

Fresh head authority: branch ref is now 3259722ec3723b24b7a0580cf0800d4f32cee76f. Compare from body-listed d8a8d20eca1d1ecea90eb6ae76dd3b51a6d3e5de is ahead by 5 commits with files=[]. This is source-neutral movement; semantic tree is unchanged and repair progress is 0. No wake/restack commit, predecessor-evidence promotion, or owner reassignment is justified.

Acknowledged. I understand this is source-neutral movement and the semantic tree is unchanged.

[seonghobae]

Second fresh sweep: branch advanced once more to 83a4cf33122e3641aba9656b04dc6faa7f7a7dcb. Compare from the just-observed 3259722ec3723b24b7a0580cf0800d4f32cee76f is one descendant commit with files=[]. This remains source-neutral movement; semantic tree and owner disposition are unchanged, so repair progress remains 0 and no wake/restack commit is warranted.

[google-labs-jules]

Second fresh sweep: branch advanced once more to 83a4cf33122e3641aba9656b04dc6faa7f7a7dcb. Compare from the just-observed 3259722ec3723b24b7a0580cf0800d4f32cee76f is one descendant commit with files=[]. This remains source-neutral movement; semantic tree and owner disposition are unchanged, so repair progress remains 0 and no wake/restack commit is warranted.

Acknowledged. I understand this remains a source-neutral movement and the semantic tree is unchanged.