diff --git a/AGENTS.md b/AGENTS.md
index 3c05c91b3..d17ae311b 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 / 0296 / 0297 / 0298) 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 / 0297 / 0298 / 0299) 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
@@ -452,6 +452,12 @@ compares leftover pairs can match the pair-row `R` badge; a missing or non-finit
`R` omits that leftover-map comparison residual badge and does not invent
`R` from `Y` and `E` or from leftover-map distance. The strip does not gain the
leftover-map graphic.
+ADR 0299 captions grouping comparison leftover-pair buttons with persisted leftover
+observed `Y` through formatLeftoverMapObserved so a buyer who
+compares leftover pairs can match the pair-row `Y` badge; a missing or non-finite
+`Y` omits that leftover-map comparison observed badge and does not invent
+`Y` from `R` and `E` 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
@@ -486,6 +492,8 @@ Grouping comparison leftover-map unexplained leftover (ADR 0297) captions groupi
buttons with persisted leftover-map unexplained leftover `U`.
Grouping comparison leftover residual (ADR 0298) captions grouping comparison leftover-pair
buttons with persisted leftover residual `R`.
+Grouping comparison leftover observed (ADR 0299) captions grouping comparison leftover-pair
+buttons with persisted leftover observed `Y`.
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 fe9027238..3278beca8 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -687,6 +687,8 @@ ADR 0297 captions grouping comparison leftover-pair buttons with persisted lefto
unexplained leftover `U` through formatLeftoverMapUnexplained.
ADR 0298 captions grouping comparison leftover-pair buttons with persisted leftover
residual `R` through formatLeftoverMapResidual.
+ADR 0299 captions grouping comparison leftover-pair buttons with persisted leftover
+observed `Y` through formatLeftoverMapObserved.
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
@@ -712,8 +714,9 @@ incomplete item coverage (ADR 0292), leftover-map reconstruction `R̂`
(ADR 0294), leftover-map unexplained leftover share `s`
(ADR 0295), leftover-map cross share `x`
(ADR 0296), leftover-map unexplained leftover `U`
-(ADR 0297), and leftover residual `R`
-(ADR 0298);
+(ADR 0297), leftover residual `R`
+(ADR 0298), and leftover observed `Y`
+(ADR 0299);
`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/2.56.0-leftover-map-compare-observed.md b/CHANGELOG.d/2.56.0-leftover-map-compare-observed.md
new file mode 100644
index 000000000..c5b5d16b6
--- /dev/null
+++ b/CHANGELOG.d/2.56.0-leftover-map-compare-observed.md
@@ -0,0 +1,16 @@
+## 2.56.0 — Leftover observed on grouping comparison strip pair rows
+
+- Caption leftover observed `Y` on grouping comparison strip leftover-pair
+ buttons through formatLeftoverMapObserved (ADR 0299). After `make seed`,
+ closest and farthest leftover pairs sit above the member list with grouping
+ comparison leftover-pair buttons that match leftover observed `Y` on the
+ pair row; click a post marker or a pair button opens that post. A missing
+ or non-finite `Y` omits that leftover-map comparison observed badge and
+ keeps leftover residual `R` when finite, leftover-map unexplained leftover
+ `U` when finite, leftover-map cross share `x` when finite, 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
+ `Y` from `R` and `E`. A finite negative leftover 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 b1d674dff..b81a34b29 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,57 @@ 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 observed `Y` through
+ formatLeftoverMapObserved (ADR 0299 / v2.56.0). 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, grouping comparison leftover-pair
+ buttons that match leftover-map cross share `x` on the pair row,
+ grouping comparison leftover-pair buttons that match leftover-map
+ unexplained leftover `U` on the pair row, grouping comparison leftover-pair
+ buttons that match leftover residual `R` on the pair row, and grouping
+ comparison leftover-pair buttons that match leftover observed `Y` on the
+ pair row; click a post marker or a pair button opens that post. A missing
+ or non-finite `Y` omits that leftover-map comparison observed badge and
+ keeps leftover residual `R` when finite, leftover-map unexplained leftover
+ `U` when finite, leftover-map cross share `x` when finite, 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
+ `Y` from `R` and `E`, leftover-map distance, plotted coordinates,
+ leftover residual, leftover-map reconstruction, leftover-map unexplained
+ leftover, 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 leftover 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 residual `R` through
formatLeftoverMapResidual (ADR 0298 / v2.55.0). After `make seed`,
diff --git a/CLAUDE.md b/CLAUDE.md
index 50c56d7dc..6866e7e13 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 / 0296 / 0297 / 0298), 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 / 0297 / 0298 / 0299), 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/0299-leftover-map-compare-observed.md b/docs/adr/0299-leftover-map-compare-observed.md
new file mode 100644
index 000000000..5fca58597
--- /dev/null
+++ b/docs/adr/0299-leftover-map-compare-observed.md
@@ -0,0 +1,212 @@
+# ADR 0299 — Name leftover observed 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 observed `Y` /
+expected `E` ([ADR 0163](0163-leftover-observed-expected.md)), leftover observed on
+pair segments ([ADR 0278](0278-leftover-map-segment-observed.md)), leftover residual
+on grouping comparison strip pair rows
+([ADR 0298](0298-leftover-map-compare-residual.md)), leftover-map unexplained leftover
+on grouping comparison strip pair rows
+([ADR 0297](0297-leftover-map-compare-unexplained.md)), leftover-map cross share
+on grouping comparison strip pair rows
+([ADR 0296](0296-leftover-map-compare-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 residual
+disclosure ([ADR 0162](0162-leftover-residual-disclosure.md)), leftover residual
+on pair segments ([ADR 0277](0277-leftover-map-segment-residual.md)), leftover-map
+unexplained leftover persistence ([ADR 0182](0182-leftover-map-unexplained.md)),
+and leftover-map reconstruction persistence
+([ADR 0201](0201-leftover-map-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-map
+unexplained leftover on pair segments
+([ADR 0276](0276-leftover-map-segment-unexplained-leftover.md)), leftover-map
+cross share on pair segments ([ADR 0275](0275-leftover-map-segment-cross-share.md)),
+leftover-map unexplained leftover share on pair segments
+([ADR 0274](0274-leftover-map-segment-unexplained-share.md)), leftover-map
+explained leftover share on pair segments
+([ADR 0273](0273-leftover-map-segment-explained-share.md)), leftover-map
+reconstruction on pair segments
+([ADR 0272](0272-leftover-map-segment-reconstruction.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-map rank
+persistence ([ADR 0164](0164-leftover-map-rank.md)), leftover-map
+cross share persistence ([ADR 0185](0185-leftover-map-cross-share.md)), leftover-map
+unexplained leftover share persistence
+([ADR 0233](0233-leftover-map-unexplained-share.md)), leftover-map explained leftover
+share persistence ([ADR 0266](0266-leftover-map-explained-share.md)), and leftover-map
+axis share persistence ([ADR 0148](0148-leftover-map-axis-share.md)).
+
+## Context
+
+ADR 0163 already persists observed category `Y` and expected
+`E[Y|θ, item]` on leftover pair rows. ADR 0049 already names that observed
+response on the period-report pair list. ADR 0278 already names it on leftover-map
+graphic-display pair segments. ADR 0298 already captions persisted leftover residual
+`R` on grouping comparison leftover-pair buttons. The strip pair button still does
+not name `Y`, so a buyer who compares leftover pairs can treat leftover residual
+`R`, leftover-map unexplained leftover `U`, leftover-map cross share `x`, leftover-map
+unexplained leftover share `s`, leftover-map explained leftover share `e`, leftover-map
+reconstruction `R̂`, or leftover-map distance `d` as the category that entered the
+truncated map even after the pair list and graphic already name `Y`. When `Y`, `E`,
+and `R` are finite, `Y − E = R`; hiding `Y` on the strip lets that identity
+vanish without a next action.
+
+This increment captions persisted leftover observed on each grouping comparison
+leftover-pair button through formatLeftoverMapObserved. It does not add columns.
+It does not recompute `Y` from `R` and `E`, leftover-map distance, plotted
+coordinates, leftover residual, leftover-map reconstruction, leftover-map
+explained leftover share, leftover-map unexplained leftover share, leftover-map
+cross share, or leftover-map unexplained leftover. 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 **0299** so it does not collide with
+leftover residual on grouping comparison strip pair rows (0298), leftover-map
+unexplained leftover on grouping comparison strip pair rows (0297), leftover-map
+cross share on grouping comparison strip pair rows (0296), 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 observed on
+pair segments (0278), leftover observed `Y` / expected `E` (0163), leftover residual
+on pair segments (0277), leftover residual disclosure (0162), leftover expected on
+pair segments (0279), leftover-map unexplained leftover on pair segments (0276),
+leftover-map unexplained leftover persistence (0182), 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 observed formatter as the pair-row `Y` badge, next
+to leftover residual `R`, leftover-map unexplained leftover `U`, leftover-map
+cross share `x`, 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 observed` so the strip badge is not the graphic caption
+(`leftover observed {label}`). A missing or non-finite `Y` omits that leftover-map
+comparison observed badge and keeps leftover residual `R` when finite,
+leftover-map unexplained leftover `U` when finite, leftover-map cross share `x`
+when finite, 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 `Y 0.00` when that persisted
+observed response is finite. A finite negative leftover is shown, never clamped.
+Do not invent `Y` from `R` and `E`, leftover-map distance, plotted coordinates,
+leftover residual, leftover-map reconstruction, leftover-map unexplained leftover,
+leftover-map explained leftover share, leftover-map unexplained leftover share,
+leftover-map cross 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, persisted leftover-map cross share `x`
+when finite, persisted leftover-map unexplained leftover `U` when finite,
+persisted leftover residual `R` when finite, and persisted leftover observed
+`Y` 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 `Y`, `E`, and `R` are finite, `Y − E = R`.
+When `R`, `R̂`, and `U` are finite, `U + R̂ = R`.
+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 cross share on
+grouping comparison strip pair rows, leftover-map unexplained leftover on
+grouping comparison strip pair rows, leftover residual on grouping
+comparison strip pair rows, leftover-map inner product, leftover-map cosine,
+leftover-map length, leftover-map graphic display, leftover residual on pair
+segments, leftover observed on pair segments, leftover expected on pair
+segments, leftover-map unexplained leftover on pair segments, leftover-map
+unexplained leftover persistence, 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
+
+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. Leftover observed of
+the leftover cell is the persisted category `Y` after IRT main effects.
+Grouping comparison leftover observed names that persisted category on the
+strip pair row only when formatLeftoverMapObserved returns a usable badge.
+When finite, `Y − E = R`.)
+
+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
diff --git a/docs/product-technical-gap-baseline.md b/docs/product-technical-gap-baseline.md
index a0d682aef..cdb28e3c5 100644
--- a/docs/product-technical-gap-baseline.md
+++ b/docs/product-technical-gap-baseline.md
@@ -1,5 +1,23 @@
# Product & Technical Gap Baseline
+> Exact-head loop overlay: 2026-08-31 01:40 KST. Protected `main` is
+> `cb187cadee5fb6c46d8a944815ccc154a1e028d1`. Writes work. Do not
+> self-approve. #835 leftover residual `R` on grouping comparison
+> leftover-pair buttons (v2.55.0 / ADR 0298) is `a825c33`, stacked on
+> #833 @ `18d89b4`. Parallel residual #834 on #832 is a competing stack;
+> leave both open. Next buyer increment on this cycle: leftover observed
+> `Y` on grouping comparison leftover-pair buttons (ADR 0299 / v2.56.0)
+> delivered locally on `feat/leftover-map-compare-observed-v2560`. Caption
+> each strip leftover-pair button through formatLeftoverMapObserved with
+> distinct aria-label `Leftover map comparison observed`. UI-only; no new
+> columns. Missing or non-finite `Y` omits that badge independently of
+> `R`, `U`, `x`, `s`, `e`, `R̂`, `d`, and coverage notes. Do not invent
+> `Y` from `R` and `E`. A finite negative leftover is shown, never
+> clamped. Stack onto #835. Leave open for independent review. Do not
+> squash-merge. Issues #79 and #87 stay open. #96 is already closed. Do
+> not merge #808 without independent APPROVE.
+
+
> Exact-head loop overlay: 2026-08-31 01:30 KST. Protected `main` is
> `cb187cadee5fb6c46d8a944815ccc154a1e028d1`. Writes work. Do not
> self-approve. #833 leftover-map unexplained leftover `U` on grouping
diff --git a/frontend/package.json b/frontend/package.json
index 228735341..4f0158ad8 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
{
"name": "frontend",
"private": true,
- "version": "2.55.0",
+ "version": "2.56.0",
"type": "module",
"scripts": {
"dev": "vite",
diff --git a/frontend/src/App.test.tsx b/frontend/src/App.test.tsx
index ee0157a0b..94524dbc9 100644
--- a/frontend/src/App.test.tsx
+++ b/frontend/src/App.test.tsx
@@ -937,6 +937,7 @@ describe("App, authenticated", () => {
leftover_map_unexplained_share: 0.02,
leftover_map_cross_share: 0.12,
leftover_map_unexplained: 0.05,
+ observed_response: 2.4,
},
],
leftover_map_coverage: {
@@ -4433,6 +4434,21 @@ describe("App, authenticated", () => {
"Leftover map comparison residual",
)[1],
).toHaveTextContent("R +0.40");
+ expect(
+ within(screen.getByLabelText("Grouping comparison")).queryByLabelText(
+ /leftover observed/,
+ ),
+ ).not.toBeInTheDocument();
+ expect(
+ within(screen.getByLabelText("Grouping comparison")).getByLabelText(
+ "Leftover map comparison observed",
+ ),
+ ).toHaveTextContent("Y 2.40");
+ expect(
+ within(screen.getByLabelText("Grouping comparison")).getAllByLabelText(
+ "Leftover map comparison observed",
+ ),
+ ).toHaveLength(1);
expect(
screen.getByRole("button", {
name: /open leftover closest pair from comparison: specification revision requested/i,
@@ -4468,6 +4484,11 @@ describe("App, authenticated", () => {
name: /open leftover closest pair from comparison: specification revision requested/i,
}),
).toHaveTextContent("R −1.10");
+ expect(
+ screen.getByRole("button", {
+ name: /open leftover closest pair from comparison: specification revision requested/i,
+ }),
+ ).not.toHaveTextContent("Y ");
expect(
screen.getByRole("button", { name: "Compare Business unit (PU): Demo Report High, mean θ 0.81" }),
).toHaveTextContent("mean θ 0.81");
@@ -4517,6 +4538,11 @@ describe("App, authenticated", () => {
name: /open leftover closest pair from comparison: public post/i,
}),
).toHaveTextContent("R +0.40");
+ expect(
+ screen.getByRole("button", {
+ name: /open leftover closest pair from comparison: public post/i,
+ }),
+ ).toHaveTextContent("Y 2.40");
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 7ec7adae8..e902b82ee 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -161,6 +161,10 @@ import {
formatLeftoverMapResidual,
LEFTOVER_MAP_COMPARE_RESIDUAL_LABEL,
} from "./leftoverResidual";
+import {
+ formatLeftoverMapObserved,
+ LEFTOVER_MAP_COMPARE_OBSERVED_LABEL,
+} from "./leftoverObservedExpected";
import "./App.css";
const AdminPanel = lazy(() => import("./components/AdminPanel").then((module) => ({ default: module.AdminPanel })));
@@ -4099,6 +4103,7 @@ function ReportsPanel({
pair.leftover_map_unexplained,
);
const residual = formatLeftoverMapResidual(pair.leftover_residual);
+ const observed = formatLeftoverMapObserved(pair.observed_response);
return (
) : null}
+ {observed ? (
+
+ {observed}
+
+ ) : null}
);
diff --git a/frontend/src/components/LeftoverPairList.tsx b/frontend/src/components/LeftoverPairList.tsx
index 70459f799..dd141db18 100644
--- a/frontend/src/components/LeftoverPairList.tsx
+++ b/frontend/src/components/LeftoverPairList.tsx
@@ -96,7 +96,9 @@ export type LeftoverPairListProps = {
* grouping comparison leftover-pair buttons, not this pair list. ADR 0297 names
* persisted leftover-map unexplained leftover on grouping comparison leftover-pair
* buttons, not this pair list. ADR 0298 names persisted leftover residual on
- * grouping comparison leftover-pair buttons, not this pair list. Every badge still
+ * grouping comparison leftover-pair buttons, not this pair list. ADR 0299 names
+ * persisted leftover observed 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 f5ec82c8f..11ad098af 100644
--- a/frontend/src/i18n.test.ts
+++ b/frontend/src/i18n.test.ts
@@ -87,6 +87,7 @@ describe("i18n", () => {
"Leftover map comparison cross share",
"Leftover map comparison unexplained leftover",
"Leftover map comparison residual",
+ "Leftover map comparison observed",
"Leftover-map graphic item coverage",
"Leftover map item coverage",
"Leftover map incomplete posts",
@@ -505,6 +506,19 @@ describe("i18n", () => {
},
);
+ it.each([
+ ["ko", "잔여 지도 비교 관측"],
+ ["zh", "残差地图比较观测"],
+ ["ja", "残差マップの比較観測"],
+ ["vi", "Quan sát so sánh bản đồ phần dư"],
+ ] as const)(
+ "formats leftover map comparison observed label in %s",
+ (locale, expected) => {
+ setLocale(locale);
+ expect(t("Leftover map comparison observed")).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 029f653df..af8853f9f 100644
--- a/frontend/src/i18n.ts
+++ b/frontend/src/i18n.ts
@@ -278,6 +278,7 @@ const TRANSLATIONS: Partial>> = {
"Leftover map comparison cross share": "잔여 지도 비교 교차 점유율",
"Leftover map comparison unexplained leftover": "잔여 지도 비교 미설명 잔여",
"Leftover map comparison residual": "잔여 지도 비교 잔여",
+ "Leftover map comparison observed": "잔여 지도 비교 관측",
"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",
@@ -894,6 +895,7 @@ const TRANSLATIONS: Partial>> = {
"Leftover map comparison cross share": "残差地图比较交叉份额",
"Leftover map comparison unexplained leftover": "残差地图比较未解释残差",
"Leftover map comparison residual": "残差地图比较残差",
+ "Leftover map comparison observed": "残差地图比较观测",
"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",
@@ -1531,6 +1533,7 @@ const TRANSLATIONS: Partial>> = {
"Leftover map comparison cross share": "残差マップの比較交差割合",
"Leftover map comparison unexplained leftover": "残差マップの比較未説明残差",
"Leftover map comparison residual": "残差マップの比較残差",
+ "Leftover map comparison observed": "残差マップの比較観測",
"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",
@@ -2147,6 +2150,7 @@ const TRANSLATIONS: Partial>> = {
"Leftover map comparison cross share": "Phần giao so sánh bản đồ phần dư",
"Leftover map comparison unexplained leftover": "Phần dư chưa giải thích so sánh",
"Leftover map comparison residual": "Phần dư so sánh bản đồ phần dư",
+ "Leftover map comparison observed": "Quan sát 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/leftoverMapPlotLayout.ts b/frontend/src/leftoverMapPlotLayout.ts
index 0c8b5dfc4..b86341f4b 100644
--- a/frontend/src/leftoverMapPlotLayout.ts
+++ b/frontend/src/leftoverMapPlotLayout.ts
@@ -25,8 +25,9 @@
* (ADR 0294), grouping comparison unexplained leftover share
* (ADR 0295), grouping comparison leftover-map cross share
* (ADR 0296), grouping comparison leftover-map unexplained leftover
- * (ADR 0297), and grouping comparison leftover residual
- * (ADR 0298) caption the pair list or the grouping comparison strip,
+ * (ADR 0297), grouping comparison leftover residual
+ * (ADR 0298), and grouping comparison leftover observed
+ * (ADR 0299) caption the pair list or the grouping comparison strip,
* not this graphic layout.
*/
diff --git a/frontend/src/leftoverObservedExpected.test.ts b/frontend/src/leftoverObservedExpected.test.ts
index 52ead7f6d..258a69184 100644
--- a/frontend/src/leftoverObservedExpected.test.ts
+++ b/frontend/src/leftoverObservedExpected.test.ts
@@ -3,6 +3,7 @@ import {
formatLeftoverMapExpected,
formatLeftoverMapObserved,
formatLeftoverObservedExpected,
+ LEFTOVER_MAP_COMPARE_OBSERVED_LABEL,
} from "./leftoverObservedExpected";
describe("formatLeftoverObservedExpected", () => {
@@ -34,6 +35,11 @@ describe("formatLeftoverMapObserved", () => {
expect(formatLeftoverMapObserved(Number.NaN)).toBeNull();
expect(formatLeftoverMapObserved(Number.POSITIVE_INFINITY)).toBeNull();
});
+
+ it("keeps the grouping comparison observed label distinct from the graphic observed label", () => {
+ expect(LEFTOVER_MAP_COMPARE_OBSERVED_LABEL).toBe("Leftover map comparison observed");
+ expect(LEFTOVER_MAP_COMPARE_OBSERVED_LABEL).not.toBe("leftover observed {label}");
+ });
});
describe("formatLeftoverMapExpected", () => {
diff --git a/frontend/src/leftoverObservedExpected.ts b/frontend/src/leftoverObservedExpected.ts
index 86612b681..9ffc91f3f 100644
--- a/frontend/src/leftoverObservedExpected.ts
+++ b/frontend/src/leftoverObservedExpected.ts
@@ -1,5 +1,8 @@
/** Observed Y and expected E[Y|θ, item] after IRT main effects. */
+export const LEFTOVER_MAP_COMPARE_OBSERVED_LABEL =
+ "Leftover map comparison observed";
+
export function formatLeftoverObservedExpected(
observed: number | null | undefined,
expected: number | null | undefined,
diff --git a/pyproject.toml b/pyproject.toml
index 61be353ce..09a2849c2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
[project]
name = "lineageweave"
-version = "2.55.0"
+version = "2.56.0"
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" }