scenario-zbrush-hard-surface

# ZBrush hard surface Hard surface is judged as a result: it reads as manufactured when every edge is clearly straight or clearly curved, planes carry an even highlight, edges are wide enough to catch light and every part could be built (Plouffe, Klimer). The agent builds that language from deterministic operations (primitives, Live Boolean stacks, polygroups as the crease plan, Dynamic Subdivision numbers, ArrayMesh, Panel Loops) and uses clicks and strokes only where nothing else exists. If a sibling skill named here is missing from your available skills, ask the user to install it (`npx skills add scenario-labs/skills --skill <name>`); unattended, proceed from tool schemas and flag the gap. **REQUIRED BACKGROUND:** scenario-zbrush-expert (bridge, stroke engine, review loop, 2026 traps). Toolkit: [`scripts/zb_hardsurface.py`](scripts/zb_hardsurface.py) (`import sys; sys.path.insert(0, "<this skill>/scripts"); import zb_hardsurface as hs`, then `hs.hs_call("new_part", "cube")`), built on the lead's `zb_ops`, `zb_review`, `zb_audit` and `zb_stroke`. Nothing in it has run in ZBrush yet. ## Stance (the expert delta) - **Polygroups are the crease plan.** Groups By Normals at 45 degrees (33 catches softer planes, 60 misses edges), Mirror And Weld, UnCreaseAll, Crease PG (Pavlovich; Plouffe). Crease first, a loop only where the falloff must be local. Crease PG after later edits recreases borders you softened on purpose: regroup, or crease by angle. - **The gap SmoothSubdiv min...