diff --git a/AGENTS.md b/AGENTS.md
index 5cd94d89f..a767bd321 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -273,7 +273,7 @@ stops startup instead of leaving a healthy-looking partial schema, and
application code must not compensate for a missing table.
Period leftover pairs (ADR 0017 / 0018 / 0048 / 0049 / 0119 / 0158 / 0162 /
-0163 / 0164 / 0182 / 0185 / 0201 / 0233 / 0266 / 0267 / 0268 / 0269 / 0270 / 0271 / 0272 / 0273 / 0274 / 0275 / 0276 / 0277 / 0278 / 0279 / 0280 / 0281 / 0282 / 0283 / 0284 / 0285 / 0286 / 0287 / 0288 / 0289 / 0290 / 0291 / 0292 / 0293 / 0294 / 0295) are computed in `lineageweave/leftover_pairs.py` from the
+0163 / 0164 / 0182 / 0185 / 0201 / 0233 / 0266 / 0267 / 0268 / 0269 / 0270 / 0271 / 0272 / 0273 / 0274 / 0275 / 0276 / 0277 / 0278 / 0279 / 0280 / 0281 / 0282 / 0283 / 0284 / 0285 / 0286 / 0287 / 0288 / 0289 / 0290 / 0291 / 0292 / 0293 / 0294 / 0295 / 0296) are computed in `lineageweave/leftover_pairs.py` from the
residual after a real GRM/GPCM score, never invented. Distances are
Euclidean on the two-dimensional Gabriel leftover map; missing cells stay
out of the factorization. Closest and farthest post–criterion pairs
@@ -434,6 +434,12 @@ compares leftover pairs can match the pair-row `U²/R²` badge; a missing or non
`s` omits that leftover-map comparison unexplained leftover share badge and does not invent
`s` from `U` and `R` or from leftover-map distance. The strip does not gain the
leftover-map graphic.
+ADR 0296 captions grouping comparison leftover-pair buttons with persisted leftover-map
+cross share `x` through formatLeftoverMapCrossShare so a buyer who
+compares leftover pairs can match the pair-row `2R̂U/R²` badge; a missing or non-finite
+`x` omits that leftover-map comparison cross share badge and does not invent
+`x` from `R̂`, `U`, and `R` or from leftover-map distance. The strip does not gain the
+leftover-map graphic.
When `R`, `R̂`, `U`, `x`,
`s`, and `e` are finite, `e + s + x = 1`. When `Y`, `E`, and `R` are
finite, `Y − E = R`. When `R`, `R̂`, and `U` are
@@ -462,6 +468,8 @@ Grouping comparison explained leftover share (ADR 0294) captions grouping compar
buttons with persisted leftover-map explained leftover share `e`.
Grouping comparison unexplained leftover share (ADR 0295) captions grouping comparison leftover-pair
buttons with persisted leftover-map unexplained leftover share `s`.
+Grouping comparison leftover-map cross share (ADR 0296) captions grouping comparison leftover-pair
+buttons with persisted leftover-map cross share `x`.
Item complete-case coverage
(ADR 0282) captions the leftover-map graphic with how many scored criteria
entered the map. Item complete-case coverage on the pair list (ADR 0285)
diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index e2e6b7be8..d8a47c972 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -681,6 +681,8 @@ ADR 0294 captions grouping comparison leftover-pair buttons with persisted lefto
explained leftover share `e` through formatLeftoverMapExplainedShare.
ADR 0295 captions grouping comparison leftover-pair buttons with persisted leftover-map
unexplained leftover share `s` through formatLeftoverMapUnexplainedShare.
+ADR 0296 captions grouping comparison leftover-pair buttons with persisted leftover-map
+cross share `x` through formatLeftoverMapCrossShare.
Click a post marker or a pair button
opens that post. Those ADRs are the normative mathematical, storage, and
display contracts. Leftover-map axis share
@@ -703,8 +705,9 @@ leftover-map complete-case coverage (ADR 0289), leftover-map item complete-case
coverage (ADR 0290), leftover-map incomplete post coverage (ADR 0291), leftover-map
incomplete item coverage (ADR 0292), leftover-map reconstruction `R̂`
(ADR 0293), leftover-map explained leftover share `e`
-(ADR 0294), and leftover-map unexplained leftover share `s`
-(ADR 0295);
+(ADR 0294), leftover-map unexplained leftover share `s`
+(ADR 0295), and leftover-map cross share `x`
+(ADR 0296);
`POST .../rebuild` scores every grouping kind (post_admin). `make seed`
folds A-100/B-200 Event Lineage fixtures (and the Riverbend calendar
post) that already have constructed IRT cells into the same shared
diff --git a/CHANGELOG.d/2.53.0-leftover-map-compare-cross-share.md b/CHANGELOG.d/2.53.0-leftover-map-compare-cross-share.md
new file mode 100644
index 000000000..aa34afbbd
--- /dev/null
+++ b/CHANGELOG.d/2.53.0-leftover-map-compare-cross-share.md
@@ -0,0 +1,47 @@
+## 2.53.0 — Leftover-map cross share on grouping comparison strip pair rows
+
+- Caption leftover-map cross share `x` on grouping comparison strip
+ leftover-pair buttons through formatLeftoverMapCrossShare (ADR 0296).
+ 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, a plot caption
+ that matches leftover-map item complete-case coverage, a plot caption
+ that matches leftover-map incomplete post coverage, a plot caption that
+ matches leftover-map incomplete item coverage, a pair-list note that
+ matches leftover-map post complete-case coverage, a pair-list note that
+ matches leftover-map item complete-case coverage, a pair-list note that
+ matches leftover-map incomplete post coverage, a pair-list note that
+ matches leftover-map incomplete item coverage, a grouping comparison
+ note that matches leftover-map post complete-case coverage, a grouping
+ comparison note that matches leftover-map item complete-case coverage,
+ a grouping comparison note that matches leftover-map incomplete post
+ coverage, a grouping comparison note that matches leftover-map
+ incomplete item coverage, grouping comparison leftover-pair buttons
+ that match leftover-map reconstruction `R̂` on the pair row, grouping
+ comparison leftover-pair buttons that match leftover-map explained
+ leftover share `e` on the pair row, grouping comparison leftover-pair
+ buttons that match leftover-map unexplained leftover share `s` on the
+ pair row, and grouping comparison leftover-pair buttons that match
+ leftover-map cross share `x` on the pair row; click a post marker or a
+ pair button opens that post. A missing or non-finite `x` omits that
+ leftover-map comparison cross share badge and keeps leftover-map
+ unexplained leftover share `s` when finite, leftover-map explained
+ leftover share `e` when finite, leftover-map reconstruction `R̂` when
+ finite, leftover-map distance `d`, plus the strip coverage notes. Do
+ not invent `x` from `R̂`, `U`, and `R`, leftover-map distance, plotted
+ coordinates, leftover-map reconstruction, leftover residual,
+ leftover-map rank, leftover-map post coverage, leftover-map item
+ coverage, leftover-map incomplete post coverage, leftover-map
+ incomplete item coverage, or the count of unused axes. A finite
+ negative share is shown, never clamped. The strip does not gain the
+ leftover-map graphic. Never invent a leftover score. Never invent a
+ theta. No new columns.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b9b2d3e75..c57a69e90 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,52 @@ All notable changes to this project are documented here. Format follows
### Added
+- Period leftover pairs now caption grouping comparison leftover-pair
+ buttons with persisted leftover-map cross share `x` through
+ formatLeftoverMapCrossShare (ADR 0296 / v2.53.0). 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, a
+ plot caption that matches leftover-map item complete-case coverage, a
+ plot caption that matches leftover-map incomplete post coverage, a plot
+ caption that matches leftover-map incomplete item coverage, a pair-list
+ note that matches leftover-map post complete-case coverage, a pair-list
+ note that matches leftover-map item complete-case coverage, a pair-list
+ note that matches leftover-map incomplete post coverage, a pair-list
+ note that matches leftover-map incomplete item coverage, a grouping
+ comparison note that matches leftover-map post complete-case coverage,
+ a grouping comparison note that matches leftover-map item
+ complete-case coverage, a grouping comparison note that matches
+ leftover-map incomplete post coverage, a grouping comparison note
+ that matches leftover-map incomplete item coverage, grouping comparison
+ leftover-pair buttons that match leftover-map reconstruction `R̂` on the
+ pair row, grouping comparison leftover-pair buttons that match
+ leftover-map explained leftover share `e` on the pair row, grouping
+ comparison leftover-pair buttons that match leftover-map unexplained
+ leftover share `s` on the pair row, and grouping comparison leftover-pair
+ buttons that match leftover-map cross share `x` on the pair row; click a
+ post marker or a pair button opens that post. A missing or non-finite
+ `x` omits that leftover-map comparison cross share badge and keeps
+ leftover-map unexplained leftover share `s` when finite, leftover-map
+ explained leftover share `e` when finite, leftover-map reconstruction
+ `R̂` when finite, leftover-map distance `d`, plus the strip coverage
+ notes. Do not invent `x` from `R̂`, `U`, and `R`, leftover-map distance,
+ plotted coordinates, leftover-map reconstruction, leftover residual,
+ leftover-map rank, leftover-map post coverage, leftover-map item
+ coverage, leftover-map incomplete post coverage, leftover-map
+ incomplete item coverage, or the count of unused axes. A finite
+ negative share is shown, never clamped. The strip does not gain the
+ leftover-map graphic. Never invent a leftover score or a theta. No new
+ columns.
+
- Period leftover pairs now caption grouping comparison leftover-pair
buttons with persisted leftover-map unexplained leftover share `s` through
formatLeftoverMapUnexplainedShare (ADR 0295 / v2.52.0). After `make seed`,
diff --git a/CLAUDE.md b/CLAUDE.md
index fecef469e..6360d511e 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -49,7 +49,7 @@ cutoff. Global Ask optional `knowledge_cutoff` uses the same cover
Create/start endpoint rules (ADR 0017 / 0021), tie-vs-miss similarity
(ADR 0026), R&R catalog ids (ADR 0019 / 0027), leftover pairs
-(ADR 0048–0164 / 0182 / 0185 / 0201 / 0233 / 0266 / 0267 / 0268 / 0269 / 0270 / 0271 / 0272 / 0273 / 0274 / 0275 / 0276 / 0277 / 0278 / 0279 / 0280 / 0281 / 0282 / 0283 / 0284 / 0285 / 0286 / 0287 / 0288 / 0289 / 0290 / 0291 / 0292 / 0293 / 0294 / 0295), occupational construct catalog search
+(ADR 0048–0164 / 0182 / 0185 / 0201 / 0233 / 0266 / 0267 / 0268 / 0269 / 0270 / 0271 / 0272 / 0273 / 0274 / 0275 / 0276 / 0277 / 0278 / 0279 / 0280 / 0281 / 0282 / 0283 / 0284 / 0285 / 0286 / 0287 / 0288 / 0289 / 0290 / 0291 / 0292 / 0293 / 0294 / 0295 / 0296), occupational construct catalog search
(ADR 0257), the text-channel embedding swap and cosine
clamp (ADR 0190), per-edge channel-score persistence (ADR 0195),
token-backed status notices (ADR 0220),
diff --git a/docs/adr/0296-leftover-map-compare-cross-share.md b/docs/adr/0296-leftover-map-compare-cross-share.md
new file mode 100644
index 000000000..275543772
--- /dev/null
+++ b/docs/adr/0296-leftover-map-compare-cross-share.md
@@ -0,0 +1,200 @@
+# ADR 0296 — Name leftover-map cross share on grouping comparison strip pair rows
+
+**Decision status:** Accepted
+**Date:** 2026-08-31
+
+Amends leftover pairs on the grouping comparison strip
+([ADR 0149](0149-leftover-pairs-on-comparison-strip.md)), leftover-map
+cross share persistence
+([ADR 0185](0185-leftover-map-cross-share.md)), leftover-map cross share on
+pair segments
+([ADR 0275](0275-leftover-map-segment-cross-share.md)), leftover-map
+unexplained leftover share on grouping comparison strip pair rows
+([ADR 0295](0295-leftover-map-compare-unexplained-share.md)), leftover-map
+explained leftover share on grouping comparison strip pair rows
+([ADR 0294](0294-leftover-map-compare-explained-share.md)), leftover-map
+reconstruction on grouping comparison strip pair rows
+([ADR 0293](0293-leftover-map-compare-reconstruction.md)), leftover-map
+incomplete item coverage on the grouping comparison strip
+([ADR 0292](0292-leftover-map-compare-incomplete-item.md)), leftover-map
+incomplete post coverage on the grouping comparison strip
+([ADR 0291](0291-leftover-map-compare-incomplete-post.md)), leftover-map item
+complete-case coverage on the grouping comparison strip
+([ADR 0290](0290-leftover-map-compare-item-coverage.md)), leftover-map
+complete-case coverage on the grouping comparison strip
+([ADR 0289](0289-leftover-map-compare-coverage.md)), leftover-map
+unexplained leftover share persistence
+([ADR 0233](0233-leftover-map-unexplained-share.md)), leftover-map unexplained
+leftover share on pair segments
+([ADR 0274](0274-leftover-map-segment-unexplained-share.md)), leftover-map
+explained leftover share persistence
+([ADR 0266](0266-leftover-map-explained-share.md)), leftover-map explained
+leftover share on pair segments
+([ADR 0273](0273-leftover-map-segment-explained-share.md)), leftover-map
+reconstruction persistence ([ADR 0201](0201-leftover-map-reconstruction.md)),
+and leftover-map reconstruction on pair segments
+([ADR 0272](0272-leftover-map-segment-reconstruction.md)). Independent of leftover-map
+post complete-case coverage fail-closed on the pair list
+([ADR 0288](0288-leftover-map-list-post-coverage-helper.md)), leftover-map
+incomplete item coverage on the pair list
+([ADR 0287](0287-leftover-map-list-incomplete-item.md)), leftover-map incomplete
+post coverage on the pair list
+([ADR 0286](0286-leftover-map-list-incomplete-post.md)), leftover-map item
+complete-case coverage on the pair list
+([ADR 0285](0285-leftover-map-list-item-coverage.md)), leftover-map incomplete
+item coverage on the graphic display
+([ADR 0284](0284-leftover-map-plot-incomplete-item.md)), leftover-map incomplete
+post coverage on the graphic display
+([ADR 0283](0283-leftover-map-plot-incomplete.md)), leftover-map item
+complete-case coverage on the graphic display
+([ADR 0282](0282-leftover-map-plot-item-coverage.md)), leftover-map complete-case
+coverage on the graphic display
+([ADR 0281](0281-leftover-map-plot-coverage.md)), leftover-map rank on pair
+segments ([ADR 0280](0280-leftover-map-segment-rank.md)), leftover expected on pair
+segments ([ADR 0279](0279-leftover-map-segment-expected.md)), leftover observed on
+pair segments ([ADR 0278](0278-leftover-map-segment-observed.md)), leftover
+residual on pair segments ([ADR 0277](0277-leftover-map-segment-residual.md)),
+leftover-map unexplained leftover on pair segments
+([ADR 0276](0276-leftover-map-segment-unexplained-leftover.md)), leftover-map
+distance on pair segments ([ADR 0271](0271-leftover-map-segment-distance.md)),
+leftover-map coordinate ticks ([ADR 0270](0270-leftover-map-coordinate-ticks.md)),
+leftover-map axis share on the graphic display
+([ADR 0269](0269-leftover-map-axis-share-plot.md)), leftover residual
+disclosure ([ADR 0162](0162-leftover-residual-disclosure.md)), leftover
+observed `Y` / expected `E` ([ADR 0163](0163-leftover-observed-expected.md)),
+leftover-map unexplained leftover persistence
+([ADR 0182](0182-leftover-map-unexplained.md)), leftover-map rank
+persistence ([ADR 0164](0164-leftover-map-rank.md)), and leftover-map axis
+share persistence ([ADR 0148](0148-leftover-map-axis-share.md)).
+
+## Context
+
+ADR 0185 already persists leftover-map cross share
+`x = 2 R̂ U / R²` of raw residual after two-axis Gabriel reconstruction.
+ADR 0049 already names that share on the period-report pair list. ADR 0275
+already names it on leftover-map graphic-display pair segments. ADR 0295
+already captions persisted leftover-map unexplained leftover share `s` on
+grouping comparison leftover-pair buttons. The strip pair button still does
+not name `x`, so a buyer who compares leftover pairs can treat leftover-map
+unexplained leftover share `s`, leftover-map explained leftover share `e`,
+leftover-map reconstruction `R̂`, or leftover-map distance `d` as the leftover
+identity remainder even after the pair list and graphic already name
+`2R̂U/R²`. When `R`, `R̂`, `U`, `x`, `s`, and `e` are finite,
+`e + s + x = 1`; hiding `x` on the strip lets that identity vanish without
+a next action.
+
+This increment captions persisted leftover-map cross share on each grouping
+comparison leftover-pair button through formatLeftoverMapCrossShare. It does
+not add columns. It does not recompute `x` from `R̂`, `U`, and `R`, leftover-map
+distance, plotted coordinates, leftover-map reconstruction, leftover residual,
+leftover-map explained leftover share, or leftover-map unexplained leftover
+share. It does not persist leftover-map inner product, cosine, or length as
+separate columns. Do not invent a leftover score. Do not invent a theta.
+
+The dashboard stack already used neighbouring leftover facts under other
+numbers. This protected increment uses **0296** so it does not collide with
+leftover-map unexplained leftover share on grouping comparison strip pair
+rows (0295), leftover-map explained leftover share on grouping comparison
+strip pair rows (0294), leftover-map reconstruction on grouping comparison
+strip pair rows (0293), leftover-map incomplete item coverage on the grouping
+comparison strip (0292), leftover-map incomplete post coverage on the grouping
+comparison strip (0291), leftover-map item complete-case coverage on the
+grouping comparison strip (0290), leftover-map complete-case coverage on the
+grouping comparison strip (0289), leftover-map cross share on pair segments
+(0275), leftover-map cross share persistence (0185), leftover-map unexplained
+leftover share on pair segments (0274), leftover-map unexplained leftover
+share persistence (0233), leftover-map explained leftover share on pair
+segments (0273), leftover-map explained leftover share persistence (0266),
+leftover-map reconstruction on pair segments (0272), leftover-map
+reconstruction persistence (0201), or the dashboard stacks.
+
+## Decision
+
+On the grouping comparison strip, caption each leftover pair button with
+the same persisted leftover-map cross share formatter as the pair-row
+`2R̂U/R²` badge, next to leftover-map unexplained leftover share `s`,
+leftover-map explained leftover share `e`, leftover-map reconstruction `R̂`,
+and leftover-map distance `d`. Use the distinct accessible name
+`Leftover map comparison cross share` so the strip badge is not the graphic
+caption (`leftover-map cross share {label}`). A missing or non-finite `x`
+omits that leftover-map comparison cross share badge and keeps leftover-map
+unexplained leftover share `s` when finite, leftover-map explained leftover
+share `e` when finite, leftover-map reconstruction `R̂` when finite,
+leftover-map distance `d`, the strip leftover-map post coverage note,
+leftover-map item coverage note, leftover-map incomplete post note,
+leftover-map incomplete item note, leftover pairs, and any leftover-map
+captions on the pair list and graphic. Rank-0 origin cells still name
+`2R̂U/R² 0.00` when that persisted share is finite. A finite negative share
+is shown, never clamped. Do not invent `x` from `R̂`, `U`, and `R`, leftover-map
+distance, plotted coordinates, leftover-map reconstruction, leftover residual,
+leftover-map explained leftover share, leftover-map unexplained leftover
+share, leftover-map rank, leftover-map post coverage, leftover-map item
+coverage, leftover-map incomplete post coverage, leftover-map incomplete
+item coverage, or the count of unused axes. Do not add the leftover-map
+graphic to the strip. Click a leftover pair on the strip to open that post.
+
+Do not add SQL. Do not edit shipped migrations. Do not persist inner
+product, cosine, or length as separate columns. Do not invent a leftover
+score. Do not invent a theta.
+
+## Consequences
+
+After `make seed`, the grouping comparison strip names persisted leftover-map
+post complete-case coverage, persisted leftover-map item complete-case
+coverage, persisted leftover-map incomplete post coverage, and persisted
+leftover-map incomplete item coverage on each grouping row when
+leftoverMapCoverageCounts / leftoverMapItemCoverageCounts /
+leftoverMapIncompletePostCount / leftoverMapIncompleteItemCount return usable
+integers, then names leftover pairs with leftover-map distance `d`, persisted
+leftover-map reconstruction `R̂` when finite, persisted leftover-map
+explained leftover share `e` when finite, persisted leftover-map unexplained
+leftover share `s` when finite, and persisted leftover-map cross share `x`
+when finite. Closest and farthest leftover pairs still sit above the member
+list with the leftover-map graphic display; click a post marker or a pair
+button opens that post.
+Hidden posts stay hidden. When `R`, `R̂`, `U`, `x`, `s`, and `e` are
+finite, `e + s + x = 1`.
+
+## Related
+
+Independent of leftover interaction-map persistence, leftover-criterion
+evaluation landing, leftover residual disclosure, leftover-map
+complete-case coverage persistence, leftover-map axis share persistence,
+leftover pairs on the grouping comparison strip, leftover-map complete-case
+coverage on the grouping comparison strip, leftover-map item complete-case
+coverage on the grouping comparison strip, leftover-map incomplete post
+coverage on the grouping comparison strip, leftover-map incomplete item
+coverage on the grouping comparison strip, leftover-map reconstruction on
+grouping comparison strip pair rows, leftover-map explained leftover share
+on grouping comparison strip pair rows, leftover-map unexplained leftover
+share on grouping comparison strip pair rows, leftover-map inner product,
+leftover-map cosine, leftover-map length, leftover-map graphic display,
+leftover-map cross share on pair segments, leftover-map cross share
+persistence, leftover-map unexplained leftover share on pair segments,
+leftover-map unexplained leftover share persistence, leftover-map explained
+leftover share on pair segments, leftover-map explained leftover share
+persistence, leftover-map reconstruction on pair segments, leftover-map
+reconstruction persistence, leftover-map item complete-case coverage on the
+graphic display, leftover-map item complete-case coverage on the pair list,
+leftover-map incomplete post coverage on the graphic display, leftover-map
+incomplete post coverage on the pair list, leftover-map incomplete item
+coverage on the graphic display, leftover-map incomplete item coverage on
+the pair list, and leftover-map post complete-case coverage fail-closed on
+the pair list.
+
+## References
+
+Gabriel, K. R. (1971). The biplot graphic display of matrices with
+application to principal component analysis. *Biometrika, 58*(3),
+453–467. https://doi.org/10.1093/biomet/58.3.453
+
+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.
+https://doi.org/10.1007/s11336-021-09762-5
+(LSIRM interaction `−γ‖ξ_j − ζ_i‖` after main effects
+`α_j − β_i`; typically `p = 2` for the interaction map. Cross share of the
+leftover cell is `x = 2 R̂ U / R²` after two-axis Gabriel reconstruction.
+Grouping comparison leftover-map cross share names that persisted remainder
+on the strip pair row only when formatLeftoverMapCrossShare returns a usable
+badge. When finite, `e + s + x = 1`.)
diff --git a/docs/product-technical-gap-baseline.md b/docs/product-technical-gap-baseline.md
index 507437366..21642a618 100644
--- a/docs/product-technical-gap-baseline.md
+++ b/docs/product-technical-gap-baseline.md
@@ -1,5 +1,84 @@
# Product & Technical Gap Baseline
+> Exact-head loop overlay: 2026-08-31 00:48 KST. Protected `main` is
+> `cb187cadee5fb6c46d8a944815ccc154a1e028d1` after unauthorized squash
+> of leftover-map coordinates (v2.24.0 / #782). Revert #808
+> (`revert-pr782-unauthorized` @ `1af3e53e`) restores `main` toward
+> `fc13acaa` (v2.23.0) and still needs independent APPROVE. GitHub
+> writes work (comment/close/create-PR/push). Token still has empty
+> `X-OAuth-Scopes`; repo permission is ADMIN. Open leftover stack
+> still lacks independent APPROVE. Do not self-approve.
+> #782 leftover-map coordinates through pair-segment distance
+> (v2.24.0–v2.28.0 / ADR 0267–0271) is `9bdd3e4d`. #802 explained
+> leftover share on pair segments (v2.30.0 / ADR 0273, includes v2.29
+> reconstruction) is `79ec22f0`. #803 unexplained leftover share on pair
+> segments (v2.31.0 / ADR 0274) is `089a1571`. #804 leftover-map cross
+> share on pair segments (v2.32.0 / ADR 0275) is `c513002b`. #805 leftover-map
+> unexplained leftover `U` on pair segments (v2.33.0 / ADR 0276) is
+> `e3fdfd74`. #806 leftover residual `R` on pair segments (v2.34.0 /
+> ADR 0277) is `33f6c3dd`. #809 leftover observed `Y` on pair segments
+> (v2.35.0 / ADR 0278) is `b334b00e`. #810 leftover expected `E` on pair
+> segments (v2.36.0 / ADR 0279) is `6e37757a`. #811 leftover-map rank on
+> pair segments (v2.37.0 / ADR 0280) is `e626a1d0`. #812 leftover-map
+> complete-case coverage on the graphic (v2.38.0 / ADR 0281) is `64964cb6`.
+> #813 leftover-map item complete-case coverage on the graphic (v2.39.0 /
+> ADR 0282) is `de2a8a8b`. #814 leftover-map incomplete post coverage on
+> the graphic (v2.40.0 / ADR 0283) is `77292872`. #815 leftover-map
+> incomplete item coverage on the graphic (v2.41.0 / ADR 0284) is
+> `63092de`. #816 leftover-map item complete-case coverage on the pair
+> list (v2.42.0 / ADR 0285) is `1e3d13e`. #817 leftover-map incomplete
+> post coverage on the pair list (v2.43.0 / ADR 0286) is `ef30930`.
+> #818 leftover-map incomplete item coverage on the pair list
+> (v2.44.0 / ADR 0287) is `aa32089`. #819 leftover-map post complete-case
+> coverage fail-closed on the pair list (v2.45.0 / ADR 0288) is `a2c96551`.
+> #821 leftover-map complete-case coverage on the grouping comparison
+> strip (v2.46.0 / ADR 0289) is `11a78553`. #822 leftover-map item
+> complete-case coverage on the grouping comparison strip (v2.47.0 /
+> ADR 0290) is `6726353a`. #823 leftover-map singular values on leftover-axis
+> badges (v2.47.0 / ADR 0290, plot stack) is `eb172c40`. #824 leftover-map
+> incomplete post coverage on the grouping comparison strip (v2.48.0 /
+> ADR 0291) is `8b2ed95`. #825 leftover-map incomplete item coverage on
+> the grouping comparison strip (v2.49.0 / ADR 0292) is `bca6baa`. #826 leftover-map
+> reconstruction `R̂` on grouping comparison leftover-pair buttons
+> (v2.50.0 / ADR 0293) is `a4bf239`. #827 leftover-map explained leftover
+> share `e` on grouping comparison leftover-pair buttons (v2.51.0 /
+> ADR 0294) is `ead81bd`. #829 leftover-map unexplained leftover share
+> `s` on grouping comparison leftover-pair buttons (v2.52.0 / ADR 0295)
+> is `4d82c28`. Leave
+> #782/#802/#803/#804/#805/#806/#808/#809/#810/#811/#812/#813/#814/#815/#816/#817/#818/#819/#821/#822/#823/#824/#825/#826/#827/#829 open for
+> independent review. Do not squash-merge stacked leftover PRs onto an
+> unprotected leftover base. Do not merge #808 without independent APPROVE.
+> Strix on #782 failed closed at `Run Strix (quick)`; do not weaken
+> fail-closed on `Vulnerabilities [1-9]`. Org Strix `ModelBehaviorError`
+> classifier is already on ContextualWisdomLab/.github. Copilot review is
+> not independent APPROVE. Issues #79 and #87 stay open. #96 is already
+> closed. Only collaborator is `seonghobae`; no independent reviewer can
+> be requested from this token.
+>
+> Next buyer increment on this cycle: leftover-map cross share
+> `x` on grouping comparison leftover-pair buttons (ADR 0296 / v2.53.0)
+> delivered locally on `feat/leftover-map-compare-cross-share-v2530`.
+> Caption each strip leftover-pair button through
+> formatLeftoverMapCrossShare with distinct aria-label
+> `Leftover map comparison cross share` next to leftover-map unexplained
+> leftover share `s`, leftover-map explained leftover share `e`, leftover-map
+> reconstruction `R̂`, and leftover-map distance `d`. UI-only; no new
+> columns. Missing or non-finite `x` omits that leftover-map comparison
+> cross share badge independently of `s`, `e`, `R̂`, `d`, and coverage
+> notes. Do not invent `x` from `R̂`, `U`, and `R`, leftover-map distance,
+> plotted coordinates, leftover-map reconstruction, leftover residual,
+> leftover-map explained leftover share, leftover-map unexplained leftover
+> share, leftover-map rank, leftover-map post coverage, leftover-map item
+> coverage, leftover-map incomplete post coverage, leftover-map incomplete
+> item coverage, or the count of unused axes. A finite negative share is
+> shown, never clamped. Do not caption the leftover-map graphic on the
+> strip. Do not invent leftover scores. Stack onto leftover branch
+> `feat/leftover-map-compare-unexplained-share-v2520` / #829; leave the PR
+> open for independent review. Do not squash-merge onto the leftover
+> base. Do not persist leftover-map inner product, cosine, or length as
+> separate columns.
+
+
> Exact-head loop overlay: 2026-08-31 00:42 KST. Protected `main` is
> `cb187cadee5fb6c46d8a944815ccc154a1e028d1` after unauthorized squash
> of leftover-map coordinates (v2.24.0 / #782). Revert #808
diff --git a/frontend/package.json b/frontend/package.json
index 10d0e822c..ff2d6a69f 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
{
"name": "frontend",
"private": true,
- "version": "2.52.0",
+ "version": "2.53.0",
"type": "module",
"scripts": {
"dev": "vite",
diff --git a/frontend/src/App.test.tsx b/frontend/src/App.test.tsx
index 0649589c4..5b43c2657 100644
--- a/frontend/src/App.test.tsx
+++ b/frontend/src/App.test.tsx
@@ -935,6 +935,7 @@ describe("App, authenticated", () => {
leftover_map_reconstruction: 0.248,
leftover_map_explained_share: 0.76,
leftover_map_unexplained_share: 0.02,
+ leftover_map_cross_share: 0.12,
},
],
leftover_map_coverage: {
@@ -4381,6 +4382,21 @@ describe("App, authenticated", () => {
"Leftover map comparison unexplained leftover share",
),
).toHaveLength(1);
+ expect(
+ within(screen.getByLabelText("Grouping comparison")).queryByLabelText(
+ /leftover-map cross share/,
+ ),
+ ).not.toBeInTheDocument();
+ expect(
+ within(screen.getByLabelText("Grouping comparison")).getByLabelText(
+ "Leftover map comparison cross share",
+ ),
+ ).toHaveTextContent("2R̂U/R² 0.12");
+ expect(
+ within(screen.getByLabelText("Grouping comparison")).getAllByLabelText(
+ "Leftover map comparison cross share",
+ ),
+ ).toHaveLength(1);
expect(
screen.getByRole("button", {
name: /open leftover closest pair from comparison: specification revision requested/i,
@@ -4401,6 +4417,11 @@ describe("App, authenticated", () => {
name: /open leftover closest pair from comparison: specification revision requested/i,
}),
).not.toHaveTextContent("U²/R²");
+ expect(
+ screen.getByRole("button", {
+ name: /open leftover closest pair from comparison: specification revision requested/i,
+ }),
+ ).not.toHaveTextContent("2R̂U/R²");
expect(
screen.getByRole("button", { name: "Compare Business unit (PU): Demo Report High, mean θ 0.81" }),
).toHaveTextContent("mean θ 0.81");
@@ -4435,6 +4456,11 @@ describe("App, authenticated", () => {
name: /open leftover closest pair from comparison: public post/i,
}),
).toHaveTextContent("U²/R² 0.02");
+ expect(
+ screen.getByRole("button", {
+ name: /open leftover closest pair from comparison: public post/i,
+ }),
+ ).toHaveTextContent("2R̂U/R² 0.12");
await waitFor(() =>
expect(fetchMock).toHaveBeenCalledWith(
expect.stringContaining("/api/reports/thread_group/2026-W02"),
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 68e4f1a6a..02afbab9c 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -149,6 +149,10 @@ import {
formatLeftoverMapUnexplainedShare,
LEFTOVER_MAP_COMPARE_UNEXPLAINED_SHARE_LABEL,
} from "./leftoverMapUnexplainedShare";
+import {
+ formatLeftoverMapCrossShare,
+ LEFTOVER_MAP_COMPARE_CROSS_SHARE_LABEL,
+} from "./leftoverMapCrossShare";
import "./App.css";
const AdminPanel = lazy(() => import("./components/AdminPanel").then((module) => ({ default: module.AdminPanel })));
@@ -4080,6 +4084,9 @@ function ReportsPanel({
const unexplainedShare = formatLeftoverMapUnexplainedShare(
pair.leftover_map_unexplained_share,
);
+ const crossShare = formatLeftoverMapCrossShare(
+ pair.leftover_map_cross_share,
+ );
return (
) : null}
+ {crossShare ? (
+
+ {crossShare}
+
+ ) : null}
);
diff --git a/frontend/src/components/LeftoverPairList.tsx b/frontend/src/components/LeftoverPairList.tsx
index aa6e6ee85..195767c48 100644
--- a/frontend/src/components/LeftoverPairList.tsx
+++ b/frontend/src/components/LeftoverPairList.tsx
@@ -92,7 +92,8 @@ export type LeftoverPairListProps = {
* buttons, not this pair list. ADR 0294 names persisted leftover-map explained leftover
* share on grouping comparison leftover-pair buttons, not this pair list. ADR 0295 names
* persisted leftover-map unexplained leftover share on grouping comparison leftover-pair
- * buttons, not this pair list. Every badge still
+ * buttons, not this pair list. ADR 0296 names persisted leftover-map cross share on
+ * grouping comparison leftover-pair buttons, not this pair list. Every badge still
* renders together before opening the named post.
*/
export function LeftoverPairList({
diff --git a/frontend/src/i18n.test.ts b/frontend/src/i18n.test.ts
index 41bc10a18..8ecc22dce 100644
--- a/frontend/src/i18n.test.ts
+++ b/frontend/src/i18n.test.ts
@@ -84,6 +84,7 @@ describe("i18n", () => {
"Leftover map comparison reconstruction",
"Leftover map comparison explained leftover share",
"Leftover map comparison unexplained leftover share",
+ "Leftover map comparison cross share",
"Leftover-map graphic item coverage",
"Leftover map item coverage",
"Leftover map incomplete posts",
@@ -463,6 +464,19 @@ describe("i18n", () => {
},
);
+ it.each([
+ ["ko", "잔여 지도 비교 교차 점유율"],
+ ["zh", "残差地图比较交叉份额"],
+ ["ja", "残差マップの比較交差割合"],
+ ["vi", "Phần giao so sánh bản đồ phần dư"],
+ ] as const)(
+ "formats leftover map comparison cross share label in %s",
+ (locale, expected) => {
+ setLocale(locale);
+ expect(t("Leftover map comparison cross share")).toBe(expected);
+ },
+ );
+
it.each([
["ko", "잔여 지도 그림 기준 포함 범위"],
["zh", "残差图图形准则覆盖范围"],
diff --git a/frontend/src/i18n.ts b/frontend/src/i18n.ts
index 6c08da157..6bf6b50ae 100644
--- a/frontend/src/i18n.ts
+++ b/frontend/src/i18n.ts
@@ -275,6 +275,7 @@ const TRANSLATIONS: Partial>> = {
"Leftover map comparison reconstruction": "잔여 지도 비교 재구성",
"Leftover map comparison explained leftover share": "잔여 지도 비교 설명 잔여 점유율",
"Leftover map comparison unexplained leftover share": "잔여 지도 비교 미설명 잔여 점유율",
+ "Leftover map comparison cross share": "잔여 지도 비교 교차 점유율",
"Leftover map item coverage": "잔여 지도 기준 포함 범위",
"Leftover map incomplete posts": "잔여 지도 불완전 글",
"Leftover map incomplete items": "잔여 지도 불완전 기준",
@@ -888,6 +889,7 @@ const TRANSLATIONS: Partial>> = {
"Leftover map comparison reconstruction": "残差地图比较重建",
"Leftover map comparison explained leftover share": "残差地图比较已解释残差份额",
"Leftover map comparison unexplained leftover share": "残差地图比较未解释残差份额",
+ "Leftover map comparison cross share": "残差地图比较交叉份额",
"Leftover map item coverage": "残差地图准则覆盖范围",
"Leftover map incomplete posts": "残差地图不完整帖文",
"Leftover map incomplete items": "残差地图不完整准则",
@@ -1522,6 +1524,7 @@ const TRANSLATIONS: Partial>> = {
"Leftover map comparison reconstruction": "残差マップの比較再構成",
"Leftover map comparison explained leftover share": "残差マップの比較説明済み残差割合",
"Leftover map comparison unexplained leftover share": "残差マップの比較未説明残差割合",
+ "Leftover map comparison cross share": "残差マップの比較交差割合",
"Leftover map item coverage": "残差マップの基準対象範囲",
"Leftover map incomplete posts": "残差マップの不完全投稿",
"Leftover map incomplete items": "残差マップの不完全基準",
@@ -2135,6 +2138,7 @@ const TRANSLATIONS: Partial>> = {
"Leftover map comparison reconstruction": "Tái dựng so sánh bản đồ phần dư",
"Leftover map comparison explained leftover share": "Phần dư giải thích so sánh bản đồ phần dư",
"Leftover map comparison unexplained leftover share": "Phần dư chưa giải thích so sánh bản đồ phần dư",
+ "Leftover map comparison cross share": "Phần giao so sánh bản đồ phần dư",
"Leftover map item coverage": "Phạm vi tiêu chí bản đồ phần dư",
"Leftover map incomplete posts": "Bài không đầy đủ trên bản đồ phần dư",
"Leftover map incomplete items": "Tiêu chí không đầy đủ trên bản đồ phần dư",
diff --git a/frontend/src/leftoverMapCrossShare.test.ts b/frontend/src/leftoverMapCrossShare.test.ts
index 350e202ed..3a224bc86 100644
--- a/frontend/src/leftoverMapCrossShare.test.ts
+++ b/frontend/src/leftoverMapCrossShare.test.ts
@@ -1,5 +1,8 @@
import { describe, expect, it } from "vitest";
-import { formatLeftoverMapCrossShare } from "./leftoverMapCrossShare";
+import {
+ formatLeftoverMapCrossShare,
+ LEFTOVER_MAP_COMPARE_CROSS_SHARE_LABEL,
+} from "./leftoverMapCrossShare";
describe("formatLeftoverMapCrossShare", () => {
it("names leftover-map cross share without inventing a leftover score", () => {
@@ -15,4 +18,13 @@ describe("formatLeftoverMapCrossShare", () => {
expect(formatLeftoverMapCrossShare(Number.POSITIVE_INFINITY)).toBeNull();
expect(formatLeftoverMapCrossShare(Number.NEGATIVE_INFINITY)).toBeNull();
});
+
+ it("keeps the grouping comparison cross share label distinct from the graphic cross share label", () => {
+ expect(LEFTOVER_MAP_COMPARE_CROSS_SHARE_LABEL).toBe(
+ "Leftover map comparison cross share",
+ );
+ expect(LEFTOVER_MAP_COMPARE_CROSS_SHARE_LABEL).not.toBe(
+ "leftover-map cross share {label}",
+ );
+ });
});
diff --git a/frontend/src/leftoverMapCrossShare.ts b/frontend/src/leftoverMapCrossShare.ts
index a113ee9dc..39367be53 100644
--- a/frontend/src/leftoverMapCrossShare.ts
+++ b/frontend/src/leftoverMapCrossShare.ts
@@ -3,6 +3,9 @@
export const LEFTOVER_MAP_CROSS_SHARE_ACTION =
"Two leftover-map axes leave identity remainder {value} of raw residual after IRT main effects. Open this post to read {criterion}.";
+export const LEFTOVER_MAP_COMPARE_CROSS_SHARE_LABEL =
+ "Leftover map comparison cross share";
+
export function formatLeftoverMapCrossShare(
value: number | null | undefined,
): string | null {
diff --git a/frontend/src/leftoverMapPlotLayout.ts b/frontend/src/leftoverMapPlotLayout.ts
index a0858de36..598545847 100644
--- a/frontend/src/leftoverMapPlotLayout.ts
+++ b/frontend/src/leftoverMapPlotLayout.ts
@@ -22,8 +22,9 @@
* (ADR 0291), grouping comparison incomplete item coverage
* (ADR 0292), grouping comparison reconstruction
* (ADR 0293), grouping comparison explained leftover share
- * (ADR 0294), and grouping comparison unexplained leftover share
- * (ADR 0295) caption the pair list or the grouping comparison strip,
+ * (ADR 0294), grouping comparison unexplained leftover share
+ * (ADR 0295), and grouping comparison leftover-map cross share
+ * (ADR 0296) caption the pair list or the grouping comparison strip,
* not this graphic layout.
*/
diff --git a/pyproject.toml b/pyproject.toml
index 8fc35c845..38d8858ff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
[project]
name = "lineageweave"
-version = "2.52.0"
+version = "2.53.0"
description = "Reconstructs git-branch-style lineage DAGs from scattered short records using multi-channel score fusion and LLM adjudication."
readme = "README.md"
license = { text = "MIT" }