feat(reports): leftover-map singular values on leftover-map comparison leftover-axis ticks independently of leftover-map axis share (v2.86.0)

[seonghobae]

Summary

• Caption leftover-map comparison leftover-axis ticks with persisted leftover-map singular values σ_k through leftoverMapCompareAxisTickBadge independently of leftover-map axis share (ADR 0329 / v2.86.0).
• After make seed, leftover-map comparison leftover-axis ticks name persisted leftover-map singular values when leftoverMapCompareAxisTickBadge returns a usable leftover-axis tick σ caption even when leftover-map axis share is omitted; click a leftover pair opens that post.
• Leftover-map comparison leftover-axis ticks stay leftover map comparison leftover axis {k} tick {value} σ {singular} when σ_k is finite so they stay distinct from leftover-map comparison graphic leftover-map axis ticks leftover map comparison graphic leftover-map axis {k} tick {value} σ {singular} (ADR 0328), from leftover-map graphic leftover-map axis ticks leftover-map axis {k} tick {value} σ {singular} (ADR 0327), from leftover-map graphic leftover-map axis leftover-map axis {k} σ {value} (ADR 0324), from leftover-axis leftover axis {k} σ {value} (ADR 0325), from comparison leftover-axis leftover map comparison leftover axis {k} σ {value} (ADR 0323), and from comparison graphic leftover-map axis leftover map comparison graphic leftover-map axis {k} σ {value} (ADR 0326).
• A missing, non-finite, or negative singular value omits that σ tick caption and keeps leftover map comparison leftover axis {k} tick {value}. Rank-0 unused axes still name σ 0.00. Leftover-map comparison leftover-axis ticks never name leftover-map axis share. Do not invent σ_k from leftover-map axis share. Do not invent leftover-map axis share from σ_k.
• UI-only; no SQL; no new columns. Never invent a leftover score. Never invent a theta. Do not persist leftover-map inner product, cosine, or length. This increment does not change leftover-map comparison graphic leftover-map axis ticks.
• Stacked onto leftover-map comparison graphic leftover-map axis tick leftover-map singular values as leftoverMapComparePlotTickAxisBadge (feat/leftover-map-compare-plot-tick-axis-badge-v2850 / feat(reports): leftover-map singular values on leftover-map comparison graphic leftover-map axis ticks independently of leftover-map axis share (v2.85.0) #869 @ 98a29e4). Leave this PR open for independent review. Do not squash-merge onto the unprotected leftover base. Do not self-approve. After independent review, retarget onto leftover-coordinates (feat/leftover-map-coordinates-v2240 / feat(reports): persist leftover-map coordinates (v2.24.0) #782) rather than squash-merging here. Issues Milestone 2: port verified direct-PostgreSQL analysis into the protected product architecture #79 and Milestone 2.1: add normalized runtime-analysis schema bridge after v0.77 #87 stay open. Do not merge revert: undo #782 squash until independent APPROVE #808 without independent APPROVE.

Test plan

• leftoverMapPlotAxisSingular.test.ts leftoverMapCompareAxisTickBadge reads 1.84/0.86 on +0.50/−0.02, names rank-0 0, omit NaN/Infinity/null/negative independently of share, σ copy leftover map comparison leftover axis {axis} tick {value} σ {singular}, never names leftover-map axis share, do not invent σ from leftover-map axis share or share from σ, stay distinct from leftoverMapComparePlotTickAxisBadge / leftoverMapPlotTickAxisBadge / leftoverMapCompareAxisBadge / leftoverMapPlotAxisBadge / leftoverMapComparePlotAxisBadge / leftoverMapAxisBadge
• App.test.tsx grouping comparison strip leftover-axis ticks leftover map comparison leftover axis 1 tick +0.50 σ 1.84 / leftover axis 2 tick −0.02 σ 0.86 / leftover axis 1 tick 0.00 σ 1.84; graphic leftover-map axis ticks stay leftover map comparison graphic leftover-map axis 1 tick +0.50 σ 1.84
• LeftoverMapPlot.test.tsx leftover-map comparison leftover-axis tick copy is absent from the comparison graphic
• i18n.test.ts required keys for leftover-map comparison leftover-axis tick σ in ko/zh/ja/vi (잔여 지도 비교 잔차 축 1 눈금 +0.50 σ 1.84 / 残差地图比较残差轴 1 刻度 +0.50 σ 1.84 / 残差マップの比較残差軸 1 目盛 +0.50 σ 1.84 / vạch trục phần dư so sánh bản đồ phần dư 1 +0.50 σ 1.84)
• frontend oxlint on changed files: 0 warnings, 0 errors
• frontend tsc -b passed
• frontend vitest: leftover-map suites + App 616 passed
• CI Full test suite and Frontend lint, test, build on this exact head
• After make seed, leftover-map comparison leftover-axis ticks name leftover-map singular values even when leftover-map axis share is omitted; click opens that post.

Evidence boundary

Authenticated PostgreSQL API and k6 runtime acceptance are not claimed. No real records or credentials. Synthetic fixtures only.

Independent approval is required. No self-approval, admin bypass, or force push.

Jeon, M., Jin, I. H., Schweinberger, M., & Baugh, S. (2021). Mapping unobserved item–respondent interactions: A latent space item response model with interaction map. Psychometrika, 86(2), 378–403.

Gabriel, K. R. (1971). The biplot graphic display of matrices with application to principal component analysis. Biometrika, 58(3), 453–467.

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[seonghobae]

Independent review required on exact head b086d97. Do not self-approve. Do not squash-merge onto the unprotected leftover base. Stacked onto #869 @ 98a29e4. Devin Review on #869 is COMMENTED, not APPROVE — do not merge #869 or this PR without independent APPROVE plus GitHub Checks on the exact SHA. Issues #79 and #87 stay open.

Buyer-facing copy: leftover-map comparison leftover-axis ticks stay leftover map comparison leftover axis {k} tick {value} σ {singular} when σ is finite, independently of leftover-map axis share. Origin 0.00 plus unique finite ξ/ζ projections match the comparison graphic. Comparison graphic leftover-map axis ticks stay ADR 0328.

Next buyer-visible increment after independent review of this PR: leftover-map leftover-axis ticks with persisted leftover-map singular values independently of leftover-map axis share (ADR 0330 / v2.87.0), stacked onto this PR — pair-list leftover-axis surface, not leftover-map comparison leftover-axis ticks (0329).

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[seonghobae]

Cycle 2026-08-31T13:31 KST: leftover-axis ticks (ADR 0330 / v2.87.0) opened as #871 stacked onto this PR @ b086d97. Leave #870 open. Independent APPROVE still required on this exact head. Do not self-approve. Do not squash-merge onto the unprotected leftover base. Issues #79 and #87 stay open.

[seonghobae]

Cycle 2026-08-31T13:54 KST: exact head b086d97 Frontend lint/test/build + Full test suite required-success. Devin Review COMMENTED (no issues) is not independent APPROVE. Leave #870 open. Do not self-approve. Do not squash-merge.