feat: two more smoke-gated examples — bmesh-gear and shader-node-group#47
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bmesh-gear witnesses the bmesh ownership contract as its subject: a 14-tooth parametric gear (profile ring, face, extrude_face_region) with bm.free() in a try/finally. Because construction is parametric the check asserts closed-form topology — verts 2x(4xteeth), faces sides+2, edges 3xprofile — and watertightness (every edge borders exactly two faces). shader-node-group witnesses the node-group contract: a TintedGloss group declared via tree.interface.new_socket (the 4.x/5.x interface API), instanced in two materials. Asserts the interface sockets exist, the group datablock is shared (users == 2), and the per-instance Tint values differ — the render is the proof: two spheres, one group, two colors (teal and magenta, extending the gallery's one-accent-per-render system; the gear is machined steel). Both verified headless on Blender 5.1.1 and 4.4.3 and wired into the smoke workflow for 4.5 LTS + 5.1, with READMEs, hero/preview renders from each example's own --output path, gallery + manifest + README rows. Gallery grows to 8. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Examples grow 6 → 8, filling the two biggest coverage gaps: bmesh as a subject, and shader node groups.
bm.free()intry/finallyper the always-free-bmesh rule. The check asserts closed-form topology (verts = 2×(4×teeth), faces = sides+2 caps, edges = 3×profile) and watertightness (every edge borders exactly 2 faces) — leaked geometry or an unclosed face fails the math.TintedGlossgroup declared viatree.interface.new_socket, instanced in two materials. Asserts interface sockets exist, the group datablock is shared (users == 2), and instance Tint values differ. The render IS the witness: two spheres, one group, two colors.bmesh/node-groupschips), CI-gated manifest, README gallery rows, regenerated pages.Testing
Both correctness checks pass headless on Blender 5.1.1 and 4.4.3 (CI gates 4.5 LTS); manifest↔disk check passes (8 examples); gallery rebuilt with 8 detail pages.
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