feat(examples): add solidify-even-thickness and boolean-exact-volume

[TMHSDigital]

Adds two rendered gallery examples taken from the ROADMAP candidate pool.

solidify-even-thickness

Contract: a strip folded at 60°, 90° and 120°, solidified in Simple mode with offset −1 and t = 0.16.

• Without use_even_offset, the shell is t·cos(φ/2) thick: 0.1386, 0.1131 and 0.0800.
• With use_even_offset, the shell is exactly t thick.
• Both closed forms come from the profile geometry and match to 3.7e-8.
• The candidate's "1/cos(θ/2)" was imprecise: the factor is cos(φ/2) on the bend angle. The shipped ROADMAP line says so.

Exit	Check
3	Topology
4	The even shell is exactly t thick
5	The plain shell matches its closed form
6	Thinning floor, so the contrast is real

Falsifier: --no-even exits 4 (0.0800 measured against 0.1600).

boolean-exact-volume

Contract: the EXACT solver on a 2 m cube and a 2 × 1 × 1 m slab whose top face is coplanar with the cube's. Both operands are translated and turned 18° about Z.

Exit	Check
3	Union, difference and intersection volumes are 9 / 7 / 1 m³ by the divergence theorem (1e-6 relative)
4	Each result is a closed 2-manifold with no loose geometry
5	The result differs from V(A), so the check cannot pass vacuously

Falsifier: --float-solver exits 3 with a 7.708 m³ union.

The floating-point solver is named 'FAST' on 4.5 and 'FLOAT' on 5.x, so the script branches on bpy.app.version. 'EXACT' has the same name on all versions.

Evidence: live local runs

All binaries are under .scratch/, and every run went through the single-Blender lock.

Run	5.2.1 LTS	4.5.11 LTS	5.1.2
solidify default	exit 0	exit 0	exit 0
--no-even	exit 4	exit 4	—
boolean default	exit 0	exit 0	exit 0
--float-solver	exit 3	exit 3	exit 3
run_example.py (both examples)	[PASS]	[PASS]	—

• Solidify's exits 5 and 6 were also forced to fail on both versions, using throwaway probe copies that have since been deleted.

Contact sheets (docs/gallery/contact-sheets/)

Tile	Luma	Stage	Warmth	Saturation
solidify-even-thickness	0.283	0.247	−0.010	0.191
boolean-exact-volume	0.238	0.197	+0.115	0.189
armature-bend	0.243	0.192	−0.144	0.237
damped-track-aim	0.237	0.218	+0.105	0.178
bmesh-gear	0.237	0.252	+0.092	0.153

• Every criterion passes for both stills.
• solidify's luma of 0.283 is bright, but it is below the shipped outliers (0.285–0.417).
• solidify-even-thickness contact sheet
• boolean-exact-volume contact sheet

Wiring

• Entries added to examples/gallery.json, the smoke catalog and plugin.json.
• README: two rows in "Mesh, curves & text" (15 → 17); examples go from 62 to 64, rendered from 54 to 56.
• AGENTS, CLAUDE and new-example-prompt counts updated.
• ROADMAP marks both candidates SHIPPED and adds a new candidate, a MANIFOLD solver witness.
• docs/gallery/ is regenerated. The alt text and witnesses callouts match gallery.json character for character.

Local checks: check_site_links (133 pages, 0 failures), check_exit_code_readme, check_engine_id, check_gallery_images and check_falsifier_targets all pass.

🤖 Generated with Claude Code