fix(examples): redesign degenerate-bevel-weld as rugged cases with a traced collapse seam

README.md

@@ -1092,7 +1092,7 @@ turns cream.
 </tr>
 <tr>
 <td width="46%" valign="middle">
-<a href="examples/degenerate-bevel-weld/"><img src="examples/degenerate-bevel-weld/preview.webp" alt="Degenerate bevel weld: two teal display trays side by side — left with a soft rounded bevel, right collapsed to a knife edge with orange seam markers at the zero-area face centroids, proving the half-dimension bevel collapse ships degenerate triangles" /></a>
+<a href="examples/degenerate-bevel-weld/"><img src="examples/degenerate-bevel-weld/preview.webp" alt="Degenerate bevel weld: two blue hard-shell equipment cases — left with a flat end panel and clean chamfer bands, right with its rim rolled into a knife ridge traced by a glowing red seam and orange beads at the zero-area faces, proving the half-dimension bevel collapse ships degenerate triangles" /></a>
 </td>
 <td valign="middle">
 

docs/gallery/index.html

@@ -794,11 +794,11 @@ <h2><a href="attribute-domain-shear/">attribute-domain-shear</a></h2>
       </article>
       <article class="card" data-tags="bmesh mesh game-pipeline">
         <a class="card-media" href="degenerate-bevel-weld/" tabindex="-1" aria-hidden="true">
-          <img src="assets/degenerate-bevel-weld-hero.webp" alt="Two teal rounded slabs labelled BEVEL 0.10 and BEVEL 0.20 = min/2, the right one with orange weld markers at its corners." loading="lazy" decoding="async" />
+          <img src="assets/degenerate-bevel-weld-hero.webp" alt="Two blue hard-shell cases: the left with a flat end panel and clean chamfer bands, the right with its rim rolled into a ridge traced by a glowing red seam and orange collapse beads." loading="lazy" decoding="async" />
         </a>
         <div class="card-body">
           <h2><a href="degenerate-bevel-weld/">degenerate-bevel-weld</a></h2>
-          <p class="teaches">Bevel offset &gt;= half the min box dimension collapses the band into zero-area faces — and they ship: a stdlib GLB re-parse counts the degenerate triangles crossing the export boundary. Dual tray: rounded edge versus knife seam, markers from live mesh data.</p>
+          <p class="teaches">Bevel offset &gt;= half the min box dimension collapses the band into zero-area faces — and they ship: a stdlib GLB re-parse counts the degenerate triangles crossing the export boundary. Two rugged cases whose shells are the check&#x27;s meshes: flat end panel versus a rolled knife ridge, the collapsed seam traced hot from live mesh data.</p>
           <p class="witnesses"><span class="tag">witnesses</span> At offset == min_dimension/2 the bevel band pinches to exactly 12 zero-area faces (4 edges x 3 segments); 32 degenerate triangles cross into the exported GLB, waiting for any merge-by-distance to weld them.</p>
           <a class="card-link" href="degenerate-bevel-weld/">View example<span class="sr-only"> degenerate-bevel-weld</span> <span aria-hidden="true">&rarr;</span></a>
         </div>

examples/degenerate-bevel-weld/README.md

@@ -39,11 +39,18 @@ future Blender changes triangulation — re-measure and update deliberately).
 **Version witness:** output is byte-identical on Blender 4.5.11 LTS and
 5.1.2 — same counts, same min_area values, same GLB triangle census.
 
-**Render as proof:** dual tray from the same `DIMS`/offsets the check
-asserts. Left keeps a soft rounded bevel; right collapses to a knife edge,
-with an emissive seam marker at every zero-area face centroid — the markers
-are placed from live mesh data, so a change in the data moves them. The
-broken state is in-frame by design.
+**Render as proof:** two rugged hard-shell equipment cases whose shells
+*are* the check's two meshes — `beveled_box(DIMS, 0.10)` and
+`beveled_box(DIMS, 0.20)` — with every fitting (handle, latches, molded
+frame, purge valve, ID plate, feet) kept inside the flat front land that
+survives both offsets, so the bevel is the only difference. The cases turn
+their end panels to the camera: the left keeps a flat end framed by clean
+chamfer bands; on the right the end and top lands are gone and the band
+rolls into a knife ridge at mid-depth. That collapsed seam is traced in hot
+red from live mesh data (every edge of every face thinner than 1e-6), with
+an orange bead on each of the 12 zero-area faces the check counts — change
+the offset and the overlay moves or disappears. The clean case is the
+designed asset and passes the asset-quality floors (exit 11).
 
 ## Run
 
@@ -57,7 +64,8 @@ blender --background --python degenerate_bevel_weld.py -- --output bevel.png --e
 ## Exit codes
 
 Per-script sequential checks. `9` is a valid check code; there is no rule
-against it. `10` is the shared framing helper.
+against it. `10` is the shared framing helper, `11` the shared
+asset-quality helper.
 
 | Code | Meaning |
 | --- | --- |
@@ -72,6 +80,7 @@ against it. `10` is the shared framing helper.
 | 8 | Degenerate GLB triangle or position count drifted |
 | 9 | `--output` produced no file |
 | 10 | Gallery framing violation |
+| 11 | Asset-quality floor violation (render path only) |
 
 The `blender-smoke` workflow runs the check on Blender 5.2 LTS and 4.5 LTS
 (5.1 on the weekly cron, the `needs-5.1` PR label, or manual dispatch).