docs(gallery): regenerate pages and contact sheets for round-two redesigns

Rebuilds docs/gallery for gn-sdf-remesh, grease-pencil-rosette, bmesh-gear, soccer-ball-goldberg, vertex-color-ao, lightmap-uv-channel, bake-normal-high-to-low, fence-kit, wooden-ladder, terrain-scatter, signpost and hitching-post. Recomposites their contact sheets against the current calibration heroes, including the new bmesh-gear. check_site_links: 91 pages, 2596 internal references, 0 failures.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: TMHSDigital

docs/gallery/attribute-domain-shear/index.html

@@ -1611,7 +1611,7 @@ <h2 id="related-h">Related</h2>
       <div class="related-grid">
         <article class="card mini">
           <a class="card-media" href="../vertex-color-ao/" tabindex="-1" aria-hidden="true">
-            <img src="../assets/vertex-color-ao-hero.webp" alt="A round stone well with a wooden windlass frame, its stones darkened near the base by baked vertex-colour ambient occlusion." width="1280" height="720" loading="lazy" decoding="async" />
+            <img src="../assets/vertex-color-ao-hero.webp" alt="A round well of chamfered, irregular stone blocks with a timber windlass frame, every masonry joint and the shaft darkened by baked vertex-colour ambient occlusion." width="1280" height="720" loading="lazy" decoding="async" />
           </a>
           <div class="card-body">
             <h3><a href="../vertex-color-ao/">vertex-color-ao</a></h3>

docs/gallery/bake-normal-high-to-low/index.html

@@ -1447,7 +1447,7 @@ <h2 id="related-h">Related</h2>
       <div class="related-grid">
         <article class="card mini">
           <a class="card-media" href="../bmesh-gear/" tabindex="-1" aria-hidden="true">
-            <img src="../assets/bmesh-gear-hero.webp" alt="A brass fourteen-tooth gear leaning back on a dark display wedge, its lathe-turned face catching a soft highlight that fans from the centre." width="1280" height="720" loading="lazy" decoding="async" />
+            <img src="../assets/bmesh-gear-hero.webp" alt="A brass fourteen-tooth gear meshing with a blued pinion and a spoked gunmetal wheel, each bolted through a hub to a dark steel backplate on a walnut plinth." width="1280" height="720" loading="lazy" decoding="async" />
           </a>
           <div class="card-body">
             <h3><a href="../bmesh-gear/">bmesh-gear</a></h3>