feat(reports): leftover-map item complete-case coverage on graphic display (v2.39.0)

[seonghobae]

Summary

• Caption the leftover-map graphic display with persisted leftover-map item complete-case coverage (ADR 0282 / v2.39.0).
• After make seed, closest and farthest leftover pairs sit above the member list with the Gabriel biplot of already-named coordinates, leftover-map axis share when finite, axis ticks that match ξ (x, y) ζ (x, y) on the pair row, pair segments that match d on the pair row, pair segments that match R̂ on the pair row, pair segments that match R̂²/R² on the pair row, pair segments that match U²/R² on the pair row, pair segments that match 2R̂U/R² on the pair row, pair segments that match U on the pair row, pair segments that match R on the pair row, pair segments that match Y on the pair row, pair segments that match E on the pair row, pair segments that match leftover-map rank on the pair row, a plot caption that matches leftover-map complete-case coverage above the pair list, and a plot caption that matches leftover-map item complete-case coverage; click a post marker or a pair button opens that post.
• A missing, non-integer, negative-used, non-positive-scored, or used-greater-than-scored item coverage omits that leftover-map item coverage caption and keeps the connecting lines and any leftover-map distance, reconstruction, explained leftover share, unexplained leftover share, leftover-map cross share, unexplained leftover, leftover residual, leftover observed, leftover expected, leftover-map rank, or leftover-map post coverage caption. Coverage 0 of M is shown when that persisted used count is a non-negative integer and scored is a positive integer. Do not invent item coverage from plotted criterion marker count, leftover-map distance, leftover-map rank, leftover-map post coverage, or the count of unused axes.
• 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. Pair-list note stays post coverage (ADR 0168).
• Stacked onto leftover-map complete-case coverage on the graphic (feat/leftover-map-plot-coverage-v2380 / feat(reports): leftover-map complete-case coverage on graphic display (v2.38.0) #812 @ 64964cb6). 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.

Verification

• frontend vitest: leftoverMapCoverage + leftoverMapPlotLayout + LeftoverMapPlot + LeftoverPairList + i18n + App leftover bits (338 passed)
• oxlint on changed leftover-map files: 0 warnings, 0 errors
• tests/test_leftover_pairs.py and PostgreSQL period-report tests were not executed here (UI-only; no schema change)

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]

Stacked onto leftover-map complete-case coverage on the graphic (#812 @ 64964cb). Independent APPROVE required. Do not self-approve. Do not squash-merge onto the leftover base. After independent review, retarget onto leftover-coordinates (#782) rather than squash-merging here.

Copilot/Devin review is not independent APPROVE. Only collaborator is seonghobae; no independent reviewer can be requested from this token.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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

[seonghobae]

Write retry this cycle (2026-08-30 20:12 KST): GitHub comment/close/create-PR/push succeed from this token. Exact head de2a8a8b still has no independent APPROVE (Devin COMMENT is not independent APPROVE). Do not self-approve. Do not squash-merge onto the leftover base. Next buyer increment is leftover-map incomplete post coverage on the graphic (ADR 0283 / v2.40.0), stacked onto this head.

[seonghobae]

Cycle write retry 2026-08-30T20:12+09:00. Head de2a8a8 remains stacked on #812 (feat/leftover-map-plot-coverage-v2380@64964cb6). Do not squash-merge onto an unprotected leftover base. Independent collaborator APPROVE required; Copilot/Devin COMMENT is not independent APPROVE. Next buyer gap ADR 0283 (leftover-map incomplete post coverage on the graphic, v2.40.0) is being stacked locally on this head — not mixed into this PR.

[seonghobae]

Write retry this cycle (2026-08-30 20:26 KST). Exact head de2a8a8b still has no independent APPROVE (Devin COMMENT is not independent APPROVE). Do not self-approve. Do not squash-merge onto the leftover base. Next buyer increment is leftover-map incomplete post coverage on the graphic (ADR 0283 / v2.40.0), stacked onto this head — not mixed into this PR.

[seonghobae]

Stacked #814 (feat/leftover-map-plot-incomplete-v2400 @ 7729287, ADR 0283 / v2.40.0 leftover-map incomplete post coverage on the graphic) onto this head. Leave #813 and #814 open. Do not squash-merge onto this leftover base.

[seonghobae]

Cycle 2026-08-30T11:26Z write retry: leftover-map item coverage (#813 @ de2a8a8) stays stacked and unmerged. No independent APPROVE exists on this org (only collaborator is seonghobae). Copilot/Devin COMMENT is not independent APPROVE. Do not squash-merge this layer onto leftover-coordinates (#782). Next buyer increment this cycle is leftover-map incomplete post coverage on the graphic (ADR 0283 / v2.40.0) stacked onto this head — UI-only caption from persisted incomplete_post_count / scored_post_count; never invent incomplete as scored−used or from marker count; omit when missing/non-integer/negative/incomplete>scored/scored≤0; show 0 of M. Pair-list note stays post complete-case (ADR 0168). Grouping comparison strip (ADR 0149) does not gain this caption. No new columns. Synthetic fixtures only. NVIDIA_NIM_API_KEY only.