fix: restage the game-prop pair heroes from deployed-page review

[TMHSDigital]

Summary

Second-pass restage of the game-prop pair (#96, #97) after reviewing both heroes at deployed gallery scale.

collision-hull-proxy (geometry + render):

• Bonnet gains its overhanging brim — the pawn-like silhouette is gone. The brim is proud geometry, so it is paid for with a cage row: exactly the containment trade-off the example teaches. The body hull still measures 70 faces — the brim band (+16) is offset by the enlarged nut cage swallowing the now-interior top dome ring (−16).
• Operating nut enlarged and re-materialized in lighter cast iron: it now reads inside the shell peak (was invisible).
• Barrel groove deepened (concave — free under the hull). Cycles 48→64 samples against enamel blotch.
• Every published number re-measured and corrected: body volume 1.022381 (was 0.968858), containment 4.4e-08 (was 5.9e-08), convexity 4.8e-08, dense-mesh hull 380 faces (was 368; ROADMAP still carried the pre-correction 374 — fixed). Face counts unchanged: body 70, caps 60×3, compound 250.

custom-normals-shade (render only, geometry untouched):

• Flat-shaded can lifts (fill 120→150 W); strip light softens (460→400 W, size 1.0→1.35) so the by-angle can's highlight band stops short of clipping; olive deepens; 64 samples.
• Check values unchanged; re-verified exit 0 on both binaries including the 4.5 legacy-op CANCELLED path.

Verification

• Checks re-run live: collision-hull-proxy exit 0, byte-identical piece stats on .scratch/blender-5.1.2-windows-x64/blender.exe (Blender 5.1.2, build 2026-05-19) and .scratch/blender-4.5.11-windows-x64/blender.exe (Blender 4.5.11 LTS, build 2026-06-23). custom-normals-shade exit 0 on both, legacy-op divergence asserted per version.
• Falsification re-confirmed on the new geometry (5.1.2): post-hull lug stretch → exit 3 (escape 0.730000); flipped winding → exit 5 (signed volume −1.022381, exact negation); deleted face → exit 4 (3 border edges). Dense-mesh hull 380 faces re-measured by live probe, not extrapolated.
• Pixels: both heroes re-rendered (Cycles 64 samples), thumbnails re-checked, contact sheets re-composited in place: collision-hull-proxy, custom-normals-shade. Mean luminance: hydrant 137.0, cans 144.6 (was 146.3 — now inside the calibration band 100.1–143.4±1%) vs calibration 139.4/100.1/143.4.
• Generated output: gallery regenerated; docs/gallery/index.html and both detail pages audited — no stale numbers (grep-verified), card alts intact.
• Inspection only: EEVEE render path on 4.5 (version-shared branch; Cycles is the shipped hero engine).