diff --git a/AGENTS.md b/AGENTS.md
index ae33e2e06..825fe408d 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 / 0299 / 0300 / 0301 / 0302 / 0303 / 0304 / 0305 / 0306 / 0307 / 0308 / 0309 / 0310 / 0311 / 0312 / 0313 / 0314 / 0315 / 0316 / 0317 / 0318 / 0319 / 0320 / 0321 / 0322 / 0323 / 0324 / 0325) 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 / 0300 / 0301 / 0302 / 0303 / 0304 / 0305 / 0306 / 0307 / 0308 / 0309 / 0310 / 0311 / 0312 / 0313 / 0314 / 0315 / 0316 / 0317 / 0318 / 0319 / 0320 / 0321 / 0322 / 0323 / 0324 / 0325 / 0326) 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
@@ -668,6 +668,14 @@ returns a usable leftover-axis caption. Distinct accessible name
 Rank-0 unused axes still name leftover-axis `σ 0.00`. Do not invent leftover-map
 singular values from leftover-map axis share. Do not invent leftover-map axis
 share from leftover-map singular values.
+ADR 0326 captions leftover-map comparison graphic leftover-map axes with persisted leftover-map
+singular values `σ_k` when leftoverMapComparePlotAxisBadge returns a usable leftover-map
+axis caption. Distinct accessible name
+`leftover map comparison graphic leftover-map axis {axis} σ {value}`. Share and
+singular value omit independently. Rank-0 unused axes still name leftover-map
+comparison graphic leftover-map axis `σ 0.00`. Do not invent leftover-map
+singular values from leftover-map axis share. Do not invent leftover-map axis
+share from leftover-map singular values.
 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
@@ -778,6 +786,9 @@ returns a usable leftover-map axis caption.
 Leftover-axis report badge leftover-map singular values independently of leftover-map axis share
 (ADR 0325) captions leftover-axis report badges with persisted leftover-map singular values
 `σ_k` when leftoverMapAxisBadge returns a usable leftover-axis caption.
+Leftover-map comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge
+(ADR 0326) captions leftover-map comparison graphic leftover-map axes with persisted leftover-map
+singular values `σ_k` when leftoverMapComparePlotAxisBadge returns a usable leftover-map axis caption.
 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 ba4108f8a..869131453 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -758,6 +758,9 @@ ADR 0324 captions leftover-map graphic-display axes with persisted leftover-map
 singular values `σ_k`.
 ADR 0325 captions leftover-axis report badges with persisted leftover-map
 singular values `σ_k` independently of leftover-map axis share.
+ADR 0326 captions leftover-map comparison graphic leftover-map axes with persisted leftover-map
+singular values `σ_k` when leftoverMapComparePlotAxisBadge returns a usable leftover-map
+axis caption.
 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
@@ -812,7 +815,9 @@ graphic (ADR 0321), leftover-map singular values on leftover-axis report badges
 (ADR 0322), leftover-map singular values on leftover-axis report badges on the
 grouping comparison strip (ADR 0323), leftover-map singular values on leftover-map
 graphic-display axes (ADR 0324), leftover-map singular values on leftover-axis
-report badges independently of leftover-map axis share (ADR 0325);
+report badges independently of leftover-map axis share (ADR 0325), leftover-map
+comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge
+(ADR 0326);
 `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/2.83.0-leftover-map-compare-plot-axis-badge.md b/CHANGELOG.d/2.83.0-leftover-map-compare-plot-axis-badge.md
new file mode 100644
index 000000000..7b715eb17
--- /dev/null
+++ b/CHANGELOG.d/2.83.0-leftover-map-compare-plot-axis-badge.md
@@ -0,0 +1,24 @@
+## 2.83.0 — Leftover-map comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge
+
+- Caption leftover-map comparison graphic leftover-map axes with persisted
+  leftover-map singular values `σ_k` through leftoverMapComparePlotAxisBadge
+  (ADR 0326). After `make seed`, grouping comparison leftover-map graphic
+  leftover-map axes name persisted leftover-map singular values when
+  leftoverMapComparePlotAxisBadge returns a usable leftover-map axis caption
+  even when leftover-map axis share is omitted; click a leftover pair opens
+  that post. A missing or non-finite leftover-map axis share omits that share
+  caption and keeps `leftover map comparison graphic leftover-map axis {k} σ {value}`.
+  A missing, non-finite, or negative singular value omits that `σ` badge and
+  keeps `leftover map comparison axis {k} ({share}%)`. Rank-0 unused axes still
+  name `σ 0.00`. Leftover-map comparison graphic leftover-map axes stay
+  `leftover map comparison graphic leftover-map axis {k} σ {value}` when share
+  is omitted so they stay distinct from leftover-axis
+  `leftover axis {k} σ {value}`, from hyphen `leftover-map axis {k} σ {value}`,
+  and from comparison leftover-axis
+  `leftover map comparison leftover axis {k} σ {value}`. Do not invent `σ_k`
+  from leftover-map axis share. Do not invent leftover-map axis share from
+  `σ_k`. This increment does not change leftover-map singular values on leftover-map
+  graphic-display axes, leftover-axis report badges, or leftover-axis report
+  badges on the grouping comparison strip. A finite negative leftover is shown,
+  never clamped. Never invent a leftover score. Never invent a theta. No new
+  columns.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c88b008df..e516a9baa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,29 @@ All notable changes to this project are documented here. Format follows
 
 ### Added
 
+- Period leftover pairs now caption leftover-map comparison graphic leftover-map
+  axes with persisted leftover-map singular values `σ_k` through
+  leftoverMapComparePlotAxisBadge (ADR 0326 / v2.83.0). After `make seed`,
+  grouping comparison leftover-map graphic leftover-map axes name persisted
+  leftover-map singular values when leftoverMapComparePlotAxisBadge returns a
+  usable leftover-map axis caption even when leftover-map axis share is omitted;
+  click a leftover pair opens that post. A missing or non-finite leftover-map
+  axis share omits that share caption and keeps
+  `leftover map comparison graphic leftover-map axis {k} σ {value}`. A missing,
+  non-finite, or negative singular value omits that `σ` badge and keeps
+  `leftover map comparison axis {k} ({share}%)`. Rank-0 unused axes still name
+  `σ 0.00`. Leftover-map comparison graphic leftover-map axes stay
+  `leftover map comparison graphic leftover-map axis {k} σ {value}` when share
+  is omitted so they stay distinct from leftover-axis
+  `leftover axis {k} σ {value}`, from hyphen `leftover-map axis {k} σ {value}`,
+  and from comparison leftover-axis
+  `leftover map comparison leftover axis {k} σ {value}`. Do not invent `σ_k`
+  from leftover-map axis share. Do not invent leftover-map axis share from
+  `σ_k`. This increment does not change leftover-map singular values on leftover-map
+  graphic-display axes, leftover-axis report badges, or leftover-axis report
+  badges on the grouping comparison strip. A finite negative leftover is shown,
+  never clamped. Never invent a leftover score or a theta. No new columns.
+
 - Period leftover pairs now caption leftover-axis report badges with persisted
   leftover-map singular values `σ_k` independently of leftover-map axis share
   (ADR 0325 / v2.82.0). After `make seed`, leftover-axis report badges name
diff --git a/CLAUDE.md b/CLAUDE.md
index 9de8440ab..4b9edef76 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 / 0299 / 0300 / 0301 / 0302 / 0303 / 0304 / 0305 / 0306 / 0307 / 0308 / 0309 / 0310 / 0311 / 0312 / 0313 / 0314 / 0315 / 0316 / 0317 / 0318 / 0319 / 0320 / 0321 / 0322 / 0323 / 0324 / 0325), 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 / 0300 / 0301 / 0302 / 0303 / 0304 / 0305 / 0306 / 0307 / 0308 / 0309 / 0310 / 0311 / 0312 / 0313 / 0314 / 0315 / 0316 / 0317 / 0318 / 0319 / 0320 / 0321 / 0322 / 0323 / 0324 / 0325 / 0326), 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/0148-leftover-map-axis-share.md b/docs/adr/0148-leftover-map-axis-share.md
index b2eebef3d..ca4f28f95 100644
--- a/docs/adr/0148-leftover-map-axis-share.md
+++ b/docs/adr/0148-leftover-map-axis-share.md
@@ -11,7 +11,9 @@
 [ADR 0324](0324-leftover-map-plot-axis-singular.md)
 (leftover-map singular values on leftover-map graphic-display axes);
 [ADR 0325](0325-leftover-map-axis-singular-only.md)
-(leftover-map singular values on leftover-axis report badges independently of leftover-map axis share)
+(leftover-map singular values on leftover-axis report badges independently of leftover-map axis share);
+[ADR 0326](0326-leftover-map-compare-plot-axis-badge.md)
+(leftover-map comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge)
 
 ## Context
 
diff --git a/docs/adr/0321-leftover-map-compare-plot-singular.md b/docs/adr/0321-leftover-map-compare-plot-singular.md
index 0d386b4d0..fa604fc98 100644
--- a/docs/adr/0321-leftover-map-compare-plot-singular.md
+++ b/docs/adr/0321-leftover-map-compare-plot-singular.md
@@ -100,7 +100,9 @@ leftover-map axis share is `σ_k² / Σ_j σ_j²`.
 ## Related
 
 Independent of leftover-map singular values on leftover-axis report badges
-([ADR 0322](0322-leftover-map-axis-singular.md)).
+([ADR 0322](0322-leftover-map-axis-singular.md)). Independent of leftover-map
+comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge
+([ADR 0326](0326-leftover-map-compare-plot-axis-badge.md)).
 
 ## References
 
diff --git a/docs/adr/0322-leftover-map-axis-singular.md b/docs/adr/0322-leftover-map-axis-singular.md
index aac40500a..d4288dd63 100644
--- a/docs/adr/0322-leftover-map-axis-singular.md
+++ b/docs/adr/0322-leftover-map-axis-singular.md
@@ -88,7 +88,9 @@ not caption leftover-map singular values on leftover-map graphic-display axes
 ([ADR 0324](0324-leftover-map-plot-axis-singular.md)). This increment does not
 caption leftover-map singular values on leftover-axis report badges independently
 of leftover-map axis share
-([ADR 0325](0325-leftover-map-axis-singular-only.md)).
+([ADR 0325](0325-leftover-map-axis-singular-only.md)). This increment does not
+caption leftover-map comparison graphic leftover-map axes through leftoverMapComparePlotAxisBadge
+([ADR 0326](0326-leftover-map-compare-plot-axis-badge.md)).
 
 ## References
 
diff --git a/docs/adr/0323-leftover-map-compare-axis-singular.md b/docs/adr/0323-leftover-map-compare-axis-singular.md
index ebe2a5260..899776b0b 100644
--- a/docs/adr/0323-leftover-map-compare-axis-singular.md
+++ b/docs/adr/0323-leftover-map-compare-axis-singular.md
@@ -107,7 +107,9 @@ Independent of leftover-map singular values on leftover-map graphic-display
 axes ([ADR 0324](0324-leftover-map-plot-axis-singular.md)).
 Independent of leftover-map singular values on leftover-axis report badges
 independently of leftover-map axis share
-([ADR 0325](0325-leftover-map-axis-singular-only.md)).
+([ADR 0325](0325-leftover-map-axis-singular-only.md)). Independent of leftover-map
+comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge
+([ADR 0326](0326-leftover-map-compare-plot-axis-badge.md)).
 
 ## References
 
diff --git a/docs/adr/0324-leftover-map-plot-axis-singular.md b/docs/adr/0324-leftover-map-plot-axis-singular.md
index bb175246f..c4a33b2ea 100644
--- a/docs/adr/0324-leftover-map-plot-axis-singular.md
+++ b/docs/adr/0324-leftover-map-plot-axis-singular.md
@@ -115,7 +115,9 @@ strip ([ADR 0323](0323-leftover-map-compare-axis-singular.md)). Independent of
 leftover-map singular values on the grouping comparison leftover-map graphic
 ([ADR 0321](0321-leftover-map-compare-plot-singular.md)). Independent of leftover-map
 singular values on leftover-axis report badges independently of leftover-map axis
-share ([ADR 0325](0325-leftover-map-axis-singular-only.md)).
+share ([ADR 0325](0325-leftover-map-axis-singular-only.md)). Independent of leftover-map
+comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge
+([ADR 0326](0326-leftover-map-compare-plot-axis-badge.md)).
 
 ## References
 
diff --git a/docs/adr/0325-leftover-map-axis-singular-only.md b/docs/adr/0325-leftover-map-axis-singular-only.md
index b11a4526a..fb4bfeb03 100644
--- a/docs/adr/0325-leftover-map-axis-singular-only.md
+++ b/docs/adr/0325-leftover-map-axis-singular-only.md
@@ -104,7 +104,9 @@ leftover-map singular values on leftover-axis report badges on the grouping
 comparison strip ([ADR 0323](0323-leftover-map-compare-axis-singular.md)).
 Independent of leftover-map singular values on leftover-axis report badges
 that still require leftover-map axis share in the combined caption
-([ADR 0322](0322-leftover-map-axis-singular.md)).
+([ADR 0322](0322-leftover-map-axis-singular.md)). Independent of leftover-map
+comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge
+([ADR 0326](0326-leftover-map-compare-plot-axis-badge.md)).
 
 ## References
 
diff --git a/docs/adr/0326-leftover-map-compare-plot-axis-badge.md b/docs/adr/0326-leftover-map-compare-plot-axis-badge.md
new file mode 100644
index 000000000..ccd02ce89
--- /dev/null
+++ b/docs/adr/0326-leftover-map-compare-plot-axis-badge.md
@@ -0,0 +1,132 @@
+# ADR 0326 — Name leftover-map comparison graphic leftover-map axis leftover-map singular values as leftoverMapComparePlotAxisBadge
+
+**Decision status:** Accepted
+**Date:** 2026-08-31
+
+Amends leftover-map singular values on the grouping comparison leftover-map
+graphic ([ADR 0321](0321-leftover-map-compare-plot-singular.md)), leftover-map
+axis share on that comparison graphic
+([ADR 0305](0305-leftover-map-compare-plot-axis-share.md)), leftover-map axis
+share persistence ([ADR 0148](0148-leftover-map-axis-share.md)). Independent of
+leftover-map singular values on leftover-map graphic-display axes
+([ADR 0324](0324-leftover-map-plot-axis-singular.md)), leftover-map singular
+values on leftover-axis report badges independently of leftover-map axis share
+([ADR 0325](0325-leftover-map-axis-singular-only.md)), leftover-map singular
+values on leftover-axis report badges on the grouping comparison strip
+([ADR 0323](0323-leftover-map-compare-axis-singular.md)), leftover-map singular
+values on leftover-axis report badges
+([ADR 0322](0322-leftover-map-axis-singular.md)).
+
+## Context
+
+ADR 0148 already persists leftover-map singular values `σ_k` and leftover-map
+axis share `σ_k² / Σ_j σ_j²`. ADR 0321 already captions leftover-map singular
+values on the grouping comparison leftover-map graphic with
+`leftover map comparison graphic leftover-map axis {k} σ {value}` when `σ_k`
+is finite. Those comparison graphic leftover-map axes still inline σ and share
+in leftoverMapPlotAxisText instead of fail-closing through a named helper.
+leftoverMapPlotAxisBadge (ADR 0324), leftoverMapCompareAxisBadge (ADR 0323),
+and leftoverMapAxisBadge (ADR 0325) already fail-close leftover-map singular
+values through named helpers. Pair-list leftover-map coverage fail-closes
+through leftoverMapCoverageCounts (ADR 0288). An inlined comparison graphic
+leftover-map axis can invent leftover-map inner product, cosine, or length,
+or couple `σ_k` to leftover-map axis share. A missing, non-finite, or negative
+singular value is not a leftover score and must omit independently of leftover-map
+axis share. Rank-0 unused axes still persist `σ_k = 0`. A finite negative leftover
+is shown, never clamped. Do not invent `σ_k` from leftover-map axis share. Do not
+invent leftover-map axis share from `σ_k`.
+
+This increment names leftover-map comparison graphic leftover-map axis leftover-map
+singular values as leftoverMapComparePlotAxisBadge, matching leftoverMapPlotAxisBadge,
+leftoverMapCompareAxisBadge, and leftoverMapAxisBadge. Comparison copy stays
+`leftover map comparison graphic leftover-map axis {k} σ {value}` when share is
+omitted so it stays distinct from leftover-axis `leftover axis {k} σ {value}`
+(ADR 0325), from hyphen `leftover-map axis {k} σ {value}` (ADR 0324), and from
+comparison leftover-axis `leftover map comparison leftover axis {k} σ {value}`
+(ADR 0323). It does not add columns. Do not invent a leftover score. Do not invent
+a theta.
+
+This protected increment uses **0326** so it does not collide with leftover-map
+singular values on leftover-axis report badges independently of leftover-map axis
+share (0325), leftover-map singular values on leftover-map graphic-display axes
+(0324), leftover-map singular values on leftover-axis report badges on the grouping
+comparison strip (0323), leftover-map singular values on leftover-axis report badges
+(0322), leftover-map singular values on the grouping comparison leftover-map graphic
+(0321), leftover-map axis share persistence (0148), or the dashboard stacks.
+
+## Decision
+
+On the grouping comparison leftover-map graphic, caption leftover-map axis `k`
+with persisted leftover-map singular value `σ_k` when leftoverMapComparePlotAxisBadge
+returns a usable leftover-map axis caption. Share and singular value omit
+independently through that helper: no share and no `σ_k` returns null and the
+graphic keeps `leftover map comparison axis {k}`; share only is
+`leftover map comparison axis {k} ({share}%)`; `σ_k` only is
+`leftover map comparison graphic leftover-map axis {k} σ {value}`; both is
+`leftover map comparison graphic leftover-map axis {k} σ {value} ({share}%)`.
+A missing or non-finite leftover-map axis share omits that share caption and
+does not invent leftover-map axis share from `σ_k`. A missing, non-finite, or
+negative singular value omits that `σ` badge and keeps a usable leftover-map
+comparison axis share caption. Rank-0 unused axes still name `σ 0.00`. Click a
+post marker to open that post. Criterion markers are not post buttons.
+
+Leftover-map comparison graphic leftover-map singular values omit independently
+of leftover-map graphic-display leftover-map axis singular values, leftover-axis
+report badge leftover-map singular values, and leftover-map comparison leftover-axis
+singular values. A missing leftover-map axis share omits that leftover-map
+comparison graphic leftover-map axis share caption and keeps a usable leftover-map
+comparison graphic leftover-map axis `σ` caption, leftover-map graphic leftover-map
+axis `σ` caption, leftover-axis `σ` caption, leftover-map comparison leftover-axis
+`σ` caption, leftover-map graphic leftover-map axis ticks, leftover-map distance
+caption, leftover-map rank caption, leftover expected `E`, leftover observed `Y`,
+leftover residual `R`, leftover-map unexplained leftover `U`, leftover-map
+reconstruction `R̂`, and leftover-map graphic coverage notes.
+
+This increment does not change leftover-map singular values on leftover-map
+graphic-display axes. Those leftover-map graphic axes stay
+`leftover-map axis {axis} σ {value} ({share}%)` (ADR 0324). This increment does
+not change leftover-map singular values on leftover-axis report badges
+(ADR 0325). This increment does not change leftover-map singular values on
+leftover-axis report badges on the grouping comparison strip (ADR 0323). This
+increment does not persist leftover-map inner product, cosine, or length.
+
+Do not add SQL. Do not edit shipped migrations. Do not invent a leftover
+score. Do not invent a theta.
+
+## Consequences
+
+After `make seed`, grouping comparison leftover-map graphic leftover-map axes
+name persisted leftover-map singular values when leftoverMapComparePlotAxisBadge
+returns a usable leftover-map axis caption even when leftover-map axis share is
+omitted; click a leftover pair opens that post. Hidden posts stay hidden. Rank-0
+unused axes still name leftover-map comparison graphic leftover-map axis `σ 0.00`.
+Leftover-map graphic-display leftover-map singular values (ADR 0324), leftover-axis
+report badge leftover-map singular values independently of leftover-map axis share
+(ADR 0325), and grouping comparison leftover-axis report badge leftover-map
+singular values (ADR 0323) remain.
+
+## Related
+
+Independent of leftover-map singular values on leftover-map graphic-display
+axes ([ADR 0324](0324-leftover-map-plot-axis-singular.md)). Independent of
+leftover-map singular values on leftover-axis report badges independently of
+leftover-map axis share ([ADR 0325](0325-leftover-map-axis-singular-only.md)).
+Independent of leftover-map singular values on leftover-axis report badges on
+the grouping comparison strip ([ADR 0323](0323-leftover-map-compare-axis-singular.md)).
+Independent of leftover-map singular values on leftover-axis report badges
+([ADR 0322](0322-leftover-map-axis-singular.md)). Independent of leftover-map
+singular values on the grouping comparison leftover-map graphic that still
+inline σ and share ([ADR 0321](0321-leftover-map-compare-plot-singular.md)).
+
+## 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.)
diff --git a/docs/product-technical-gap-baseline.md b/docs/product-technical-gap-baseline.md
index 5efa4eb84..c52f1b12a 100644
--- a/docs/product-technical-gap-baseline.md
+++ b/docs/product-technical-gap-baseline.md
@@ -1,5 +1,27 @@
 # Product & Technical Gap Baseline
 
+> Exact-head loop overlay: 2026-08-31 12:05 KST. Protected `main` is
+> `cb187cadee5fb6c46d8a944815ccc154a1e028d1`. Writes work. Do not
+> self-approve. #866 leftover-map singular values on leftover-axis report badges
+> independently of leftover-map axis share (v2.82.0 / ADR 0325) is `593b8d8`,
+> stacked on #865 @ `a3613ac`. Independent APPROVE is missing. Next buyer
+> increment on this cycle: leftover-map comparison graphic leftover-map axis
+> leftover-map singular values as leftoverMapComparePlotAxisBadge
+> (ADR 0326 / v2.83.0) delivered locally on
+> `feat/leftover-map-compare-plot-axis-badge-v2830`. Caption persisted leftover-map
+> singular values `σ_k` on leftover-map comparison graphic leftover-map axes when
+> leftoverMapComparePlotAxisBadge returns a usable leftover-map axis caption.
+> Distinct accessible name `leftover map comparison graphic leftover-map axis {axis} σ {value}`.
+> Rank-0 unused axes still name `σ 0.00`. Share and singular value omit
+> independently. Do not invent `σ_k` from leftover-map axis share. Do not invent
+> leftover-map axis share from `σ_k`. Do not persist leftover-map inner product,
+> cosine, or length. Do not change leftover-map singular values on leftover-map
+> graphic-display axes, leftover-axis report badges, or leftover-axis report
+> badges on the grouping comparison strip this increment. Stack onto #866. Leave
+> open for independent review. Do not squash-merge. Do not self-approve. Issues
+> #79 and #87 stay open. Do not merge #808 without independent APPROVE. Never
+> self-approve.
+
 > Exact-head loop overlay: 2026-08-31 11:25 KST. Protected `main` is
 > `cb187cadee5fb6c46d8a944815ccc154a1e028d1`. Writes work. Do not
 > self-approve. #865 leftover-map singular values on leftover-map graphic-display
diff --git a/frontend/package.json b/frontend/package.json
index 1f6fe1636..ca2960c70 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "frontend",
   "private": true,
-  "version": "2.82.0",
+  "version": "2.83.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/frontend/src/components/LeftoverMapPlot.tsx b/frontend/src/components/LeftoverMapPlot.tsx
index cad1f961d..3fda6999f 100644
--- a/frontend/src/components/LeftoverMapPlot.tsx
+++ b/frontend/src/components/LeftoverMapPlot.tsx
@@ -20,18 +20,14 @@ import {
   LEFTOVER_MAP_PLOT_ITEM_COVERAGE_LABEL,
 } from "../leftoverMapCoverage";
 import {
-  formatLeftoverMapPlotAxisShare,
   leftoverShareForAxis,
   LEFTOVER_MAP_COMPARE_PLOT_AXIS_1,
   LEFTOVER_MAP_COMPARE_PLOT_AXIS_2,
-  LEFTOVER_MAP_COMPARE_PLOT_AXIS_SHARE,
 } from "../leftoverMapPlotAxisShare";
 import {
-  formatLeftoverMapPlotAxisSingular,
+  leftoverMapComparePlotAxisBadge,
   leftoverMapPlotAxisBadge,
   leftoverSingularForAxis,
-  LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR,
-  LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR_SHARE,
 } from "../leftoverMapPlotAxisSingular";
 import {
   firstPlottablePairForPost,
@@ -89,22 +85,11 @@ function leftoverMapPlotAxisText(
   const leftoverShare = leftoverShareForAxis(leftoverMapAxes, axisIndex);
   const leftoverSingular = leftoverSingularForAxis(leftoverMapAxes, axisIndex);
   if (variant === "comparison") {
-    const percent = formatLeftoverMapPlotAxisShare(leftoverShare);
-    const singular = formatLeftoverMapPlotAxisSingular(leftoverSingular);
-    if (singular === null && percent === null) {
+    const badge = leftoverMapComparePlotAxisBadge(axisIndex, leftoverSingular, leftoverShare);
+    if (badge === null) {
       return t(axisIndex === 1 ? LEFTOVER_MAP_COMPARE_PLOT_AXIS_1 : LEFTOVER_MAP_COMPARE_PLOT_AXIS_2);
     }
-    if (singular === null && percent !== null) {
-      return tf(LEFTOVER_MAP_COMPARE_PLOT_AXIS_SHARE, { axis: axisIndex, share: percent });
-    }
-    if (singular !== null && percent === null) {
-      return tf(LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR, { axis: axisIndex, value: singular });
-    }
-    return tf(LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR_SHARE, {
-      axis: axisIndex,
-      value: singular as string,
-      share: percent as string,
-    });
+    return tf(badge.key, badge.values);
   }
   const badge = leftoverMapPlotAxisBadge(axisIndex, leftoverSingular, leftoverShare);
   if (badge === null) {
@@ -210,6 +195,8 @@ function leftoverMapPlotAxisText(
  * report badges on the grouping comparison strip with persisted leftover-map
  * singular values, not this graphic. ADR 0324 captions leftover-map
  * graphic-display axes with persisted leftover-map singular values.
+ * ADR 0326 fail-closes leftover-map comparison graphic leftover-map axis leftover-map
+ * singular values through leftoverMapComparePlotAxisBadge.
  * Never invent a leftover score.
  */
 export function LeftoverMapPlot({
diff --git a/frontend/src/leftoverMapAxisBadge.ts b/frontend/src/leftoverMapAxisBadge.ts
index a6d767964..d33e9ac24 100644
--- a/frontend/src/leftoverMapAxisBadge.ts
+++ b/frontend/src/leftoverMapAxisBadge.ts
@@ -4,6 +4,8 @@
  *  ADR 0323 captions leftover-axis report badges on the grouping comparison strip
  *  with a distinct leftover map comparison leftover axis name, not this helper.
  *  ADR 0324 captions leftover-map graphic-display axes, not this helper.
+ *  ADR 0326 captions leftover-map comparison graphic leftover-map axes as
+ *  leftoverMapComparePlotAxisBadge, not this helper.
  */
 
 import type { LeftoverMapAxis } from "./api";
diff --git a/frontend/src/leftoverMapPlotAxisSingular.test.ts b/frontend/src/leftoverMapPlotAxisSingular.test.ts
index 3f4056c52..acd29fb9b 100644
--- a/frontend/src/leftoverMapPlotAxisSingular.test.ts
+++ b/frontend/src/leftoverMapPlotAxisSingular.test.ts
@@ -2,6 +2,7 @@ import { describe, expect, it } from "vitest";
 import {
   formatLeftoverMapPlotAxisSingular,
   leftoverMapCompareAxisBadge,
+  leftoverMapComparePlotAxisBadge,
   leftoverMapPlotAxisBadge,
   leftoverSingularForAxis,
   LEFTOVER_MAP_COMPARE_AXIS_CAPTION,
@@ -228,3 +229,78 @@ describe("leftover-map graphic-display axis singular badges", () => {
     expect(LEFTOVER_MAP_PLOT_AXIS_SINGULAR_SHARE).not.toBe(LEFTOVER_MAP_PLOT_AXIS_SHARE);
   });
 });
+
+describe("leftover-map comparison graphic leftover-map axis singular badges", () => {
+  it("names persisted leftover-map singular values on leftover-map comparison graphic leftover-map axes", () => {
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, 0.82)).toEqual({
+      key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR_SHARE,
+      values: { axis: 1, value: "1.84", share: "82" },
+    });
+    expect(leftoverMapComparePlotAxisBadge(2, 0.86, 0.18)).toEqual({
+      key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR_SHARE,
+      values: { axis: 2, value: "0.86", share: "18" },
+    });
+  });
+
+  it("names rank-0 zero leftover-map singular values on leftover-map comparison graphic leftover-map axes", () => {
+    expect(leftoverMapComparePlotAxisBadge(1, 0, 0)).toEqual({
+      key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR_SHARE,
+      values: { axis: 1, value: "0.00", share: "0" },
+    });
+  });
+
+  it("omits leftover-map singular values independently of leftover-map axis share", () => {
+    expect(leftoverMapComparePlotAxisBadge(1, Number.NaN, 0.82)).toEqual({
+      key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SHARE,
+      values: { axis: 1, share: "82" },
+    });
+    expect(leftoverMapComparePlotAxisBadge(2, -0.01, 0.18)).toEqual({
+      key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SHARE,
+      values: { axis: 2, share: "18" },
+    });
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, Number.NaN)).toEqual({
+      key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR,
+      values: { axis: 1, value: "1.84" },
+    });
+    expect(leftoverMapComparePlotAxisBadge(1, null, null)).toBeNull();
+  });
+
+  it("does not invent leftover-map singular values from leftover-map axis share", () => {
+    expect(leftoverMapComparePlotAxisBadge(1, undefined, 0.82)?.key).toBe(
+      LEFTOVER_MAP_COMPARE_PLOT_AXIS_SHARE,
+    );
+    expect(leftoverMapComparePlotAxisBadge(1, undefined, 0.82)?.values.value).toBeUndefined();
+  });
+
+  it("does not invent leftover-map axis share from leftover-map singular values", () => {
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, undefined)?.key).toBe(
+      LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR,
+    );
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, undefined)?.values.share).toBeUndefined();
+  });
+
+  it("stays distinct from leftover-axis, leftover-map graphic, and comparison leftover-axis copy", () => {
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, 0.82)?.key).not.toBe(
+      leftoverMapPlotAxisBadge(1, 1.84, 0.82)?.key,
+    );
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, 0.82)?.key).not.toBe(
+      leftoverMapCompareAxisBadge(1, 1.84, 0.82)?.key,
+    );
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, null)?.key).not.toBe(
+      leftoverMapPlotAxisBadge(1, 1.84, null)?.key,
+    );
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, null)?.key).not.toBe(
+      leftoverMapCompareAxisBadge(1, 1.84, null)?.key,
+    );
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, null)?.key).not.toBe(
+      LEFTOVER_MAP_AXIS_BADGE_SINGULAR_ONLY,
+    );
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, 0.82)?.key).not.toBe(
+      LEFTOVER_MAP_AXIS_BADGE_SINGULAR,
+    );
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, null)?.key).not.toBe(LEFTOVER_MAP_COMPARE_PLOT_TICK);
+    expect(leftoverMapComparePlotAxisBadge(1, 1.84, 0.82)?.key).toBe(
+      LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR_SHARE,
+    );
+  });
+});
diff --git a/frontend/src/leftoverMapPlotAxisSingular.ts b/frontend/src/leftoverMapPlotAxisSingular.ts
index 8d0ab36d9..4e8b8def5 100644
--- a/frontend/src/leftoverMapPlotAxisSingular.ts
+++ b/frontend/src/leftoverMapPlotAxisSingular.ts
@@ -1,8 +1,16 @@
-/** Caption leftover-map plot axes with persisted Gabriel singular values (ADR 0324). */
+/** Caption leftover-map plot axes with persisted Gabriel singular values.
+ *  ADR 0324 names leftover-map graphic-display leftover-map axis leftover-map
+ *  singular values as leftoverMapPlotAxisBadge.
+ *  ADR 0326 names leftover-map comparison graphic leftover-map axis leftover-map
+ *  singular values as leftoverMapComparePlotAxisBadge.
+ *  ADR 0323 captions leftover-axis report badges on the grouping comparison strip
+ *  as leftoverMapCompareAxisBadge, not leftoverMapComparePlotAxisBadge.
+ */
 
 import type { LeftoverMapAxis } from "./api";
 import {
   formatLeftoverMapPlotAxisShare,
+  LEFTOVER_MAP_COMPARE_PLOT_AXIS_SHARE,
   LEFTOVER_MAP_PLOT_AXIS_SHARE,
 } from "./leftoverMapPlotAxisShare";
 
@@ -109,3 +117,28 @@ export function leftoverMapCompareAxisBadge(
     values: { axis: axisIndex, value: singular as string, share: percent as string },
   };
 }
+
+export function leftoverMapComparePlotAxisBadge(
+  axisIndex: number,
+  leftoverSingular: number | null | undefined,
+  leftoverShare: number | null | undefined,
+): LeftoverMapCompareAxisBadge | null {
+  const singular = formatLeftoverMapPlotAxisSingular(leftoverSingular);
+  const percent = formatLeftoverMapPlotAxisShare(leftoverShare);
+  if (singular === null && percent === null) {
+    return null;
+  }
+  if (singular === null && percent !== null) {
+    return { key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SHARE, values: { axis: axisIndex, share: percent } };
+  }
+  if (singular !== null && percent === null) {
+    return {
+      key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR,
+      values: { axis: axisIndex, value: singular },
+    };
+  }
+  return {
+    key: LEFTOVER_MAP_COMPARE_PLOT_AXIS_SINGULAR_SHARE,
+    values: { axis: axisIndex, value: singular as string, share: percent as string },
+  };
+}
diff --git a/frontend/src/leftoverMapPlotLayout.ts b/frontend/src/leftoverMapPlotLayout.ts
index df6cb0caa..845f07c6c 100644
--- a/frontend/src/leftoverMapPlotLayout.ts
+++ b/frontend/src/leftoverMapPlotLayout.ts
@@ -89,6 +89,8 @@
  *  with persisted leftover-map singular values, not this graphic.
  *  ADR 0324 captions leftover-map graphic-display axes with persisted leftover-map
  *  singular values `σ_k`.
+ *  ADR 0326 fail-closes leftover-map comparison graphic leftover-map axis leftover-map
+ *  singular values through leftoverMapComparePlotAxisBadge.
  */
 
 import { formatLeftoverMapCoordinatePair } from "./leftoverMapCoordinates";
diff --git a/pyproject.toml b/pyproject.toml
index ab9a1f9af..88797a9cd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "lineageweave"
-version = "2.82.0"
+version = "2.83.0"
 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" }