fix: market-stall, stone-well, gltf-export-roundtrip and prop-origin-transform quality pass (#238)

* fix: market-stall quality pass, side braces that reach both posts

The side braces stopped at mid-depth, 0.43 m short of the front post, and
were so nearly level the joint audit never classed them as braces. They
now run front post to back post, and a brace-in-post seat budget asserts
both ends (exit 17, --short-brace). Grained per-piece wood, canvas stripes,
sorted bevel input, 60 m stage, temp glb removed.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>

* fix: stone-well quality pass, varied stone, grained roof, rusted iron

No geometric defect found; the diagonal posts are deliberate and budgeted.
Each stone takes its own shade, the roof and posts take grain and a tone
per piece, and the hoops and crank are rusted iron instead of chrome.
Sorted bevel input and a 60 m stage.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>

* fix: gltf-export-roundtrip presentation, turned crates and a framing gate

Render path only: both twins turn 22 degrees to show a side, and the render
now calls check_framing, which it never did. Exit 10 is a check code here,
so a framing violation is remapped to 22. Contract and exit codes unchanged
on 4.5.11, 5.1.2 and 5.2.1.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>

* fix: prop-origin-transform presentation, visible origin axes

Render path only: the origin markers were buried in the plinth. The X and Y
stubs now cross under each base and exit it on the floor; labels are legible
at card size. Contract and exit codes unchanged on 4.5.11, 5.1.2 and 5.2.1.
Also regenerates the gallery index for all four items.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>

* docs: showcase conventions for braces and per-piece tone

From the market-stall and stone-well passes.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>

---------

Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: TMHSDigital

README.md

@@ -110,10 +110,10 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 
 <p align="center">
   <a href="showcase/shipping-crate/"><img src="showcase/shipping-crate/preview.webp" width="24%" alt="Shipping crate: a wooden slat crate with iron corner brackets on a dark studio floor, warm wedge on the back wall" /></a>
-  <a href="showcase/stone-well/"><img src="showcase/stone-well/preview.webp" width="24%" alt="Stone well: a round brick well with a shingled pyramid roof on posts, rope and bucket, on a dark studio floor" /></a>
+  <a href="showcase/stone-well/"><img src="showcase/stone-well/preview.webp" width="24%" alt="Stone well: a round well of varied grey stones with a grained wooden pyramid roof on posts, rope and a bucket on rusted iron hoops, on a dark studio floor" /></a>
   <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 rounded fieldstones around a tripod of logs and glowing ash 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 timber frame with post feet, slatted counter, rafters, and a striped awning 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 brass collars, a braced arm, and a muntined amber cage on a dark studio floor" /></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 dirt hill tile with bevelled masonry rocks on a dark studio floor" /></a>
@@ -147,7 +147,7 @@ Budget-conformance props. Not examples. Conventions: [`showcase/README.md`](show
 
 [`campfire`](showcase/campfire/) — procedural fieldstone ring, logs, and ash through the same pipeline. Falsifiers `--skip-decimate` exits 9, `--uniform-stones` exits 20.
 
-[`market-stall`](showcase/market-stall/) — procedural timber stall with striped awning and counter through the same pipeline. Falsifier `--skip-decimate` exits 9.
+[`market-stall`](showcase/market-stall/) — procedural timber stall with striped awning and counter through the same pipeline. Falsifiers `--skip-decimate` exits 9, `--short-brace` exits 17.
 
 [`street-lantern`](showcase/street-lantern/) — procedural hanging lantern with iron post, brass fittings, and amber cage through the same pipeline. Falsifier `--skip-decimate` exits 9.
 
@@ -814,7 +814,7 @@ portable path is `radius`.
 <table>
 <tr>
 <td width="46%" valign="middle">
-<a href="examples/gltf-export-roundtrip/"><img src="examples/gltf-export-roundtrip/preview.webp" alt="glTF export round-trip: two identical olive-drab sci-fi supply crates on a dark studio floor - authored beside re-imported - with teal status strips, riveted panels, and corner armor, proving the export/import round-trip preserves the asset" /></a>
+<a href="examples/gltf-export-roundtrip/"><img src="examples/gltf-export-roundtrip/preview.webp" alt="glTF export round-trip: two identical olive-drab sci-fi supply crates turned three-quarter on a dark studio floor - authored beside re-imported - with teal status strips, riveted panels, and corner armor, proving the export/import round-trip preserves the asset" /></a>
 </td>
 <td valign="middle">
 
@@ -990,7 +990,7 @@ still: DIRTY through-hole + loose-vert bead vs CLEAN manifold (same brass).
 </tr>
 <tr>
 <td width="46%" valign="middle">
-<a href="examples/prop-origin-transform/"><img src="examples/prop-origin-transform/preview.webp" alt="Prop origin transform: dual-panel TRAP vs MPI KEEP street pedestals with margins all around — left bare-parent conduit accessory teleports off its dark mount well, right accessory stays seated — proving scale apply, base origin, and matrix_parent_inverse" /></a>
+<a href="examples/prop-origin-transform/"><img src="examples/prop-origin-transform/preview.webp" alt="Prop origin transform: dual-panel TRAP vs MPI KEEP street pedestals with margins all around — left bare-parent conduit accessory teleports off its dark mount well, right accessory stays seated, origin axes crossing on the floor under each base — proving scale apply, base origin, and matrix_parent_inverse" /></a>
 </td>
 <td valign="middle">