feat: doors and windows on roof-segment wall faces

Openings now host on the walls a roof segment generates — the base
walls under the roof and the coplanar gable/shed/gambrel end faces, so
a window can sit in a gable pediment.

- core: roof-segment-walls.ts models the four vertical faces as 2D
  frames (u along face, v height) with convex profile polygons that
  mirror the wall volume getRoofSegmentBrushes builds; rect-in-profile
  clamping and anchored resize limits via half-plane algebra.
- schemas: optional roofSegmentId on door/window; position is the
  segment-local wall mid-plane center, rotation[1] the face yaw.
- cut: reuses capabilities.roofAccessory.buildCut; new cutScope: 'wall'
  subtracts from the wall brush only. cascadesViaHostSegment keeps the
  roof-merge loop from consuming door/window dirty marks (their own
  systems cascade via parentId).
- tools: roof:* handlers in door/window tool + move-tool (the Build-tab
  preset path), with roofSegmentId cleared/restored across every
  roof<->wall re-anchor and revert; shared hit resolver normalizes
  normals through world space (merged mesh vs painted segment frames).
- fix: RoofSystem no longer rebuilds per-segment CSG in accessory-reveal
  mode — the uncut rebuild used to draw over the merged shell's fresh
  opening until deselect.
- fix: the walkthrough collider world now prunes by renderer-effective
  visibility; stale uncut segment CSG inside the hidden segments-wrapper
  blocked the player at openings the merged shell had cut through.

Known gap: painted segments render per-segment CSG without accessory
cuts (pre-existing, also affects skylight/dormer). Twice Codex-reviewed;
details in private-editor plans/editor-roof-wall-openings.md.

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

packages/core/src/registry/types.ts

@@ -1205,6 +1205,23 @@ export type PaintEffectiveMaterialArgs = {
  */
 export type RoofAccessoryConfig = {
   buildCut?: (node: AnyNode, hostSegment: AnyNode) => BufferGeometry | null
+  /**
+   * Which segment brushes `buildCut` subtracts from. Wall-face openings
+   * (door / window) cut only the wall brush — subtracting the same box
+   * from the shin / deck slabs is pointless work and creates tangential
+   * / coplanar CSG cases near the gable and shed slopes. Defaults to
+   * all three (skylight / dormer genuinely poke through the deck).
+   */
+  cutScope?: 'all' | 'wall'
+  /**
+   * Set when the kind runs its own dirty-driven geometry system that
+   * already cascades to the host segment (door / window via the
+   * DoorSystem / WindowSystem `parentId` cascade). The roof-merge loop
+   * must then leave the kind's dirty marks alone — consuming them here
+   * would starve that system whenever it defers a rebuild (mesh not
+   * mounted yet, per-frame rebuild budget exhausted).
+   */
+  cascadesViaHostSegment?: boolean
 }
 
 /**