fix: anvil, signpost, text-version-stamp and cross-version-property-delete quality pass

[TMHSDigital]

Quality pass: four items, two showcase (Track A) and two gallery examples (Track B). Every pathology/cross-version example (Track C) had already been reviewed. Everything below comes from live runs on .scratch/blender-{4.5.11,5.1.2,5.2.1}-windows-x64/blender.exe, which report 4.5.11 LTS / 5.1.2 / 5.2.1 LTS, unless it is labelled inspection. Baselines were taken on the pristine tree before any edit.

(The prompt asks for "four or five pieces" in its intro and "two or three items" in Step 2. This run takes four.)

A pick I dropped: swatch-grid was picked for Track B, then left alone. Its contract samples the rendered PNG (verify_png() reads fixed grid-cell positions under a fixed ortho camera), and the flat emissive orange swatch is part of what it witnesses. Any change to layout or camera would touch an assertion. uv-layer-grid (verify_still samples pixel patches) is locked the same way. cross-version-property-delete took the slot.

A — showcase/anvil

Took 1 inspection round.

Defects

1. The waist was a turned funnel. It was lofted from ellipses, so under the rectangular face it read as a lathe part, not a forged anvil (every ortho, anvil_seat close-up, hero).
2. The steel read as chrome (metallic 0.92, roughness 0.32); flat single-tone wood (hero).
3. The wall edge showed in the corner of the hero (14 m stage).
4. The temp .glb export leaked.

Fixes, and why each is structural

• 1: the waist is a superellipse section (WAIST_P 4.5) lofted through five stations that flare from the foot in to a pinch and out to the body. The section is squared; the ellipse was the parameter at fault.
• 2: dark forged steel with rust; per-piece wood. 3: stage 60 m. 4: export removed after measuring.

New budget, identical on 4.5.11, 5.1.2 and 5.2.1:

Budget	Band	Measured
Waist form (exit 19)	corner reach at the pinch ring ≥ 0.80 (the most a section vertex fills its bounding rectangle's corner; an ellipse is 0.707)	0.8572

Triangles: 2988 → 3052 (two more waist stations; ceiling 4500). Same-binary deterministic (three runs). The stave bevel input is built from an ordered vertex list, so it was already deterministic.

Falsifier: --round-waist sets the section exponent to 2 → 19 on all three binaries (0.7071).

Existing exit codes, before → after, identical on all three: default 0→0, --skip-decimate 9→9, --stray-vert 15→15, --lift-z 16→16, --short-staves 16→16, --float-anvil 17→17, --round-band 18→18.

Hero: check_framing without deviation=. Contact sheet: docs/gallery/contact-sheets/anvil-contact-sheet.webp, luma 0.180 (band 0.151–0.305).

A — showcase/signpost

Took 1 inspection round. No geometric defect found: boards, straps, bands and shoe seat as their budgets say. The defects were surface:

1. Flat pale-yellow boards.
2. Iron read as chrome (metallic 1.0, roughness 0.38).
3. The wall edge in the corner of the hero (14 m stage).
4. Temp .glb leak; set-ordered bevel input.

Fixes: cream paint worn through to the wood by a noise mask, a shade apart per board (board_material); rusted iron; per-piece post wood; stage 60 m; export removed; bevel input sorted by edge index. No new budget.

Triangles: 376 → 376. Same-binary deterministic (three runs).

Existing exit codes, before → after, identical on all three: default 0→0, --skip-decimate 9→9, --stray-vert 15→15, --lift-z 16→16, --short-shoe 16→16, --float-strap 18→18, --gap-board 17→17, --yaw-boards 19→19.

Hero: framing passes. Contact sheet: docs/gallery/contact-sheets/signpost-contact-sheet.webp, luma 0.167.

B — examples/text-version-stamp

Presentation changes (render path only): the numerals stand on a dark plinth with the steel caption set into its front face. The caption used to float in the air above the stamp, and an emissive bar lay along the bottom edge of the frame. Also: Standard view transform, the house stage floor, and the camera reframed. README: staging note.

Contract unchanged. Before → after, identical on all three binaries: default 0 → 0, --wrong-body 4 → 4.

Framing: check_framing passes (fill x 0.784, min margin 0.044). Contact sheet: docs/gallery/contact-sheets/text-version-stamp-contact-sheet.webp, luma 0.285.

B — examples/cross-version-property-delete

Presentation changes (render path only): the two tags hang from the stand's bar on steel rods. The bar used to run 0.17 m behind the plates with nothing joining them, and the "rings" were solid discs (now hidden), so the plates hung on air. The bar now spans both plates, the post rises to it, and the base is as wide as what it carries. The camera was reframed. README: staging note.

Contract unchanged. The check reads ID properties, never geometry. The pristine script was run from a scratch copy for the baseline. Before → after, identical on all three binaries: default 0 → 0, --skip-delete 7 → 7, --unset-instead 7 → 7.

Framing: check_framing passes (fill y 0.733, min margin 0.072). Contact sheet: docs/gallery/contact-sheets/cross-version-property-delete-contact-sheet.webp, luma 0.207.

Also

• showcase/README.md conventions: A forging is not a turning; Paint wears through to what is under it.
• Gallery alts, witnessesFix text and root README alts updated. Gallery regenerated, with the generated <img alt> read back.
• Known gaps, not closed here:
  • Six gallery examples still lack an in-path framing gate.
  • No showcase piece has an asset sheet (Backfill contact sheets (26) and asset sheets (28) for existing showcase pieces #202).

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