Docs: art-dev skill - AI-generate->conform-to-Synty recipe (cookbook 14)

Bank the Mark-V lessons: when scripted primitives can't nail an iconic organic shape, generate with
Hyper3D Rodin then CONFORM - watertight clean-decimate (weld+recalc first, gentle collapse, 0 boundary
edges = hole detector), drop the baked photoreal texture for the shared flat palette, flat-shade,
ontology-tie emissives, and don't skin a meter-scale generated mesh onto a cm-scale rig (~100x shrink).
Added the generate path to the Build phase + a keystone clause (strip a kitbash/gen mesh's own texture).
Also fixed a duplicate section number (12 -> 13).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.claude/skills/art-dev/SKILL.md

@@ -11,7 +11,7 @@ The spine: **size by complexity → ground → agree the change → setup scene
 
 ## Non-negotiables (every track)
 
-1. **The material keystone ★ — no per-asset texturing, ever.** Every asset shares the ONE palette atlas (`Assets/_Project/Art/Palette/PaletteAtlas.png`) + emissive materials; color = *placing* a face's UV onto a colour band, never unwrap/paint. Three shader roles only: Lit-Palette (statics), Emissive-Gloam (glows — hue/flicker = gameplay info), Skinned-Palette (creatures/suits). This is the solo-dev keystone — deviating breaks batching, coherence, and the whole factory. Detail → [[Art_Direction_Lantern]] + `references/style-and-practices.md`.
+1. **The material keystone ★ — no per-asset texturing, ever.** Every asset shares the ONE palette atlas (`Assets/_Project/Art/Palette/PaletteAtlas.png`) + emissive materials; color = *placing* a face's UV onto a colour band, never unwrap/paint. Three shader roles only: Lit-Palette (statics), Emissive-Gloam (glows — hue/flicker = gameplay info), Skinned-Palette (creatures/suits). This is the solo-dev keystone — deviating breaks batching, coherence, and the whole factory. **A kitbashed or AI-generated mesh arrives with its OWN baked texture — that clash IS the keystone violation; strip it and re-material to the shared palette + flat-shade before it ships** (§14). Detail → [[Art_Direction_Lantern]] + `references/style-and-practices.md`.
 2. **Poly budgets + the readability law ★.** props ≤ ~800 tris · creatures ≤ ~3k · hero/boss/suit ≤ ~6k. Value-first (every warm/cold read carried by luminance + shape + flicker-cadence, not hue alone); reads at 200 px; silhouette-first. Report the tri count on every asset.
 3. **The palette ontology ★.** warm gold/amber = true light (ours) · cold corpse-green/blue = gloam (counterfeit) · lure-red = bait · white-hot = conversion. Steady = true, flicker = false. Pick emissive hues to match what the asset *is*.
 4. **Nudge-and-bake for precision ★.** Never script fine placement/pose/aesthetics blind (a script can't see painted/low-poly features + judges via a low-res grab). Stage + hand off to the operator's live GUI, then **bake the result back into a reproducible form** (bone-local offsets, saved transforms). See *The nudge-and-bake loop* below + [[blender-hybrid-nudge-and-bake]].
@@ -55,6 +55,7 @@ Establish the LANTERN working scene (snippets → `references/blender-cookbook.m
 
 ### Phase 4 — Build
 - **Model/kitbash (Auto):** primitives via `bmesh.ops`; faceted (flat shading); UVs *placed* on atlas cells (never unwrap); Synty base import via the **5.1 window-override + `ignore_leaf_bones=True, automatic_bone_orientation=False`** workaround; normalize to metres/feet-at-floor. Report tris vs budget.
+- **AI-generate an iconic shape (Auto, last resort):** when scripted primitives can't nail an *iconic organic hard-surface* form (a Mark-V helmet, an ornate horn) and hand attempts read as golf-ball/egg/blob, **generate the base with Hyper3D Rodin** then **conform it** — it arrives as raw photoreal high-poly meter-scale clay that clashes with the flat low-poly body. The conform pass IS the work: clean-decimate to budget (watertight — weld+recalc FIRST, gentle collapse, 0 boundary edges), **drop the baked texture for the shared palette**, flat-shade, ontology-tie any emissive, and (rigid accessory) don't skin a generated mesh onto a cm-scale rig (~100× shrink → invisible). Full recipe → `references/blender-cookbook.md` §14.
 - **Precision / pose / silhouette (Guided) → the nudge-and-bake loop** (next section).
 - Iterate: for Guided, the operator can request modifications ("bigger", "move it", "add another there", "stage the vent for me") — treat each as a mini Auto or a new stage. Keep going until they're happy.