@@ -114,7 +114,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
   <a href="showcase/wooden-barrel/"><img src="showcase/wooden-barrel/preview.webp" width="24%" alt="Wooden barrel: a 20-stave wine-cask with a head of four boards, chord-lofted iron hoops, and a bung on a dark studio floor" /></a>
   <a href="showcase/campfire/"><img src="showcase/campfire/preview.webp" width="24%" alt="Campfire: a two-course ring of warm, soot-dark fieldstones around a tripod of charring logs over ember-cracked coals on a dark studio floor, warm wedge on the back wall" /></a>
   <a href="showcase/market-stall/"><img src="showcase/market-stall/preview.webp" width="24%" alt="Market stall: a grained timber frame with post feet, diagonal side braces, slatted counter, rafters, and a striped canvas awning on a dark studio floor, warm wedge on the back wall" /></a>
-  <a href="showcase/street-lantern/"><img src="showcase/street-lantern/preview.webp" width="24%" alt="Street lantern: an iron post with aged brass collars, a knee brace tenoned into post and arm, and a lit muntined amber cage glowing onto the post on a dark studio floor" /></a>
+  <a href="showcase/street-lantern/"><img src="showcase/street-lantern/preview.webp" width="24%" alt="Street lantern: a cast-iron lamp post with a fluted column, brass collars, a ladder bar and a scrolled, braced arm, its banded lantern lit amber from inside" /></a>
   <a href="showcase/treasure-chest/"><img src="showcase/treasure-chest/preview.webp" width="24%" alt="Treasure chest: a slatted wooden chest with iron bands, corner brackets, and an open lid on a dark studio floor" /></a>
   <a href="showcase/terrain-scatter/"><img src="showcase/terrain-scatter/preview.webp" width="24%" alt="Terrain scatter: a Geometry Nodes hill tile of patchy grass over dark earth, nine faceted stones sunk into it among grass tufts and pebbles, on a dark studio floor" /></a>
   <a href="showcase/fence-kit/"><img src="showcase/fence-kit/preview.webp" width="24%" alt="Fence kit: a run of three weathered post-and-rail sections on a packed-earth strip sharing one post at each joint, with pyramidal caps, diagonal board braces, and iron bands" /></a>
 
@@ -76,7 +76,7 @@
       "name": "street-lantern",
       "dir": "showcase/street-lantern",
       "teaches": "A procedural hanging street lantern through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "alt": "A black iron street lamp post with aged brass collars and a knee brace, its hanging lantern lit from inside so the amber panes glow onto the post and floor.",
+      "alt": "A cast-iron street lamp: fluted post with brass collars and a ladder bar, a braced arm with wrought scrolls, and a banded brass lantern lit amber from inside.",
       "witnessesFix": "Recomputed: 3338 tris, three materials with 1530 metal, 24 glass and 209 brass faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.300×0.786×1.287 m, zmin 0, hygiene 0, brace BVH gap 0, brace ends 13 mm into the post and the arm, hanger-roof gap −1 mm, post 0.100×1.120 m plumb 0, LOD ratios in band (5.2 COLLAPSE 2 tris leaner on LOD2), convex collider 78 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z 16; --float-brace 17; --sink-arm 18; --rake-post 19; --shallow-brace 20.",
       "hero": "docs/gallery/assets/street-lantern-hero.webp",
       "preview": "showcase/street-lantern/preview.webp",
 
@@ -1,8 +1,11 @@
 # Street lantern
 
 A showcase piece, not an example. Procedural hanging street lantern
-(stepped iron foot, tapered octagonal post, brass collars, braced arm,
-muntined cage with amber panes, square pyramidal brass roof and finial)
+(stepped iron foot, tapered cast-iron column with ten flutes, two brass
+collars, a lamplighter's ladder bar with ball ends, a braced arm hung with
+two wrought C-scrolls and a forged hook ring, a muntined cage with amber
+panes between a brass eave band and base tray, square pyramidal brass roof,
+finial and drip)
 then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal
 bake, LOD chain, convex collider, Unity glTF export.
 
@@ -24,11 +27,26 @@ the arm's centre-line side, and the brace-bite budget below asserts
 that each end is actually inside its host. Brass is aged and rougher
 (it was bright polished gold at roughness 0.28).
 
+The model was the plainest in its asset sheet: a plain octagonal post and a
+bare box cage. The column is now fluted (`POST_FLUTES` channels,
+`FLUTE_DEPTH` deep, lands at the declared post radius so the post-size
+budget still reads 0.10 m) and broken by two collars; a ladder bar with ball
+ends passes through the neck; two C-scrolls weld into the arm's underside
+(each kept under 0.10 m on Y so the brace classifier never claims one); a
+hook ring rings the arm at the lantern station; and the cage gains a brass
+eave band, a base tray and a drip finial. Base triangles rose from 3338 to
+4726 and the band was re-declared around the new model (below). One
+construction hazard is recorded in the script: a 0.008 m flute depth puts a
+groove vertex exactly on the arm root's cap centre, `remove_doubles` fuses
+post and arm into one shell, and the joint audit then finds neither.
+
 The hero is lit from inside: a shadowless warm point light sits at the
 centroid of the glass faces and the panes emit at 1.6, so the lantern
 throws its glow onto the post, arm and floor. The camera is closer and
 lower on a 40 mm lens; the first hero left the lantern small in an
-empty frame. Render path only; geometry and budgets are unchanged.
+empty frame. The hero yaws the piece `HERO_YAW_DEG` (90) so the arm reaches
+across both the hero camera and the asset-sheet camera; at the old −28°
+it pointed down the sheet camera's axis and the lantern read end-on.
 
 It asserts **budget conformance** of the generated result. It does not
 witness an API contract. "It rendered without error" is not a check.
@@ -41,32 +59,36 @@ witness an API contract. "It rendered without error" is not a check.
 Hygiene combinatorics match `examples/mesh-hygiene-audit` (copied, not
 imported).
 
-Intended size: 0.30 m square foot, 1.12 m octagonal post (0.10 m across
-at the base), 0.50 m arm, 0.24 × 0.30 m cage; outer AABB
+Intended size: 0.30 m square foot, 1.12 m fluted post (0.10 m across the
+lands at the base), 0.50 m arm, 0.24 × 0.30 m cage; outer AABB
 0.300 × 0.786 × 1.287 m.
 
 ## Budgets
 
 Declared as named constants; every gate **recomputes** from the mesh,
 materials, UVs, evaluated LOD, collider, or export file.
 
-| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) |
+| Axis | Declared | Measured (4.5.11 / 5.2.1) |
 | --- | --- | --- |
-| Base triangles | 3000–3800 | 3338 / 3338 / 3338 |
-| LOD1 ratio | 0.32–0.62 of base | 0.4997 / 0.4997 / 0.4997 |
-| LOD2 ratio | 0.10–0.35 of base | 0.2199 / 0.2199 / 0.2193 |
-| Materials | exactly 3 distinct; ≥200 metal, ≥8 glass, ≥24 brass | 3 slots; 1530 / 24 / 209 |
+| Base triangles | 4200–5200 | 4726 / 4726 |
+| LOD1 ratio | 0.32–0.62 of base | 0.4998 / 0.4998 |
+| LOD2 ratio | 0.10–0.35 of base | 0.2196 / 0.2179 |
+| Materials | exactly 3 distinct; ≥200 metal, ≥8 glass, ≥24 brass | 3 slots; 2162 / 24 / 341 |
 | UVs | in `0..1`, AABB overlap ≤ 1e-5 | in range, overlap 0 |
 | Outer AABB | (0.300, 0.786, 1.287) m ± 0.01 | (0.3000, 0.7860, 1.2874), zmin 0 |
-| Collider tris | ≤ 120 | 78 |
-| Export | written, size > 0, removed after measuring | 251016 / 251016 / 251000 bytes |
+| Collider tris | ≤ 120 | 108 |
+| Export | written, size > 0, removed after measuring | 355288 / 355272 bytes |
 
-Base triangles dropped from **3520 to 3338** in the quality pass: the
-open 4-gon cone roof became a closed square pyramid, cage crossings
-stopped sharing vertices, and a pane rebate replaced coplanar glass.
+Base triangles dropped from **3520 to 3338** in the first quality pass
+(closed square-pyramid roof, unshared cage crossings, pane rebate), then
+rose to **4726** when the model gained its column flutes, second collar,
+ladder bar, arm scrolls, hook ring, eave band, base tray and drip. The band
+moved from 3000–3800 to 4200–5200, the same ~±10 % slack around the
+measured count. The 5.1.2 column was dropped with this change: the new
+model was measured on 4.5.11 and 5.2.1 only.
 
 DECIMATE COLLAPSE triangle counts are **not** identical across series —
-5.2.1 is 2 tris leaner on LOD2. The gate is a ratio band, not an exact
+5.2.1 is 8 tris leaner on LOD2. The gate is a ratio band, not an exact
 count. Bake pixels are stochastic; the gate is `has_data` plus operator
 `FINISHED`, not byte-identity. Construction uses no RNG. Export byte
 counts differ by 16 B on 5.2.1 (glTF serializer), not a gated axis.
@@ -95,11 +117,12 @@ Recomputed from the generated mesh, not asserted about the script.
 | Brace bite: deepest brace vertex inside the post / inside the arm (signed distance to the host shell) | ≥ 0.004 m each | 0.01305 / 0.01282 |
 | Arm underside vs roof peak | ≥ 0.008 m clearance | 0.05300 |
 | Hanger-to-roof BVH gap | ≤ 0.004 m | −0.00100 |
+| Scroll weld: deepest vertex of each of the 2 arm scrolls inside the arm | ≥ 0.004 m each, exactly 2 scrolls | 0.01709 |
 
 ### Falsifiers
 
-Each violates one named budget. Every falsifier was run on 4.5.11,
-5.1.2 and 5.2.1 and returned the same code on each.
+Each violates one named budget. After the model change every falsifier
+was re-run on 4.5.11 and 5.2.1 and returned the same code on each.
 
 | Flag | Budget violated | Exit |
 | --- | --- | --- |
@@ -109,7 +132,8 @@ Each violates one named budget. Every falsifier was run on 4.5.11,
 | `--float-brace` | brace-to-arm BVH gap | 17 |
 | `--sink-arm` | arm-over-roof clearance | 18 |
 | `--rake-post` | post plumb | 19 |
-| `--shallow-brace` | brace bite (the first build's ends: −0.00593 m into the post, 0.00000 m into the arm) | 20 |
+| `--shallow-brace` | brace bite (the first build's ends: −0.00638 m into the post, 0.00000 m into the arm) | 20 |
+| `--float-scroll` | scroll weld (scrolls dropped 0.03 m: −0.00873 m) | 21 |
 
 `--sink-arm` lowers only the arm. Hang-station `hang_z` stays at post
 top so the cage does not follow, which is what lets the clearance budget
@@ -129,6 +153,7 @@ blender --background --python street_lantern.py -- --float-brace
 blender --background --python street_lantern.py -- --sink-arm
 blender --background --python street_lantern.py -- --rake-post
 blender --background --python street_lantern.py -- --shallow-brace
+blender --background --python street_lantern.py -- --float-scroll
 blender --background --python street_lantern.py -- --output lantern.png
 ```
 
@@ -138,7 +163,7 @@ Smoke passes no flags.
 
 File-local. `9` is a valid check code. `10` is reserved for
 `gallery_framing.check_framing` on the `--output` path. `15`–`19` are the
-hygiene and joint-fit family; `20` is file-local.
+hygiene and joint-fit family; `20`–`21` are file-local.
 
 | Code | Meaning |
 | --- | --- |
@@ -163,3 +188,4 @@ hygiene and joint-fit family; `20` is file-local.
 | 18 | Seat: arm-roof clearance or hanger-roof gap (`--sink-arm`) |
 | 19 | Post plumb or post size off the stated real-world size (`--rake-post`) |
 | 20 | Brace bite: a brace end not inside the post or the arm (`--shallow-brace`) |
+| 21 | Scroll weld: an arm scroll not welded into the arm, or not exactly two (`--float-scroll`) |