feat: face-frame hosting for roof wall children + items on roof walls

Wall-mounted items join doors/windows on roof-segment wall faces, and
the storage model moves to FACE-LOCAL coordinates so hosted children
track segment edits live.

- Children store roofFace + position [u, v, z-from-mid-plane] with
  rotation 0 in-frame — the exact wall-child conventions (the wall
  volume's mid-plane lands on the nominal footprint). A shared
  <RoofFaceHostFrame> derives segment pose + face frame from the
  live-override-merged segment: children follow resize handle drags in
  real time and never jump on commit. No re-anchor cascade needed —
  position is authoritative, the frame is derived. migrateNodes
  converts branch-era segment-local data.
- Items: roofWallStrategy + roof:* handlers in the placement
  coordinator (surface 'roof-wall'), Shift free-place normalized with
  walls, ItemSystem wall-side push extended to segment hosts, correct
  2D plan glyphs via face→segment→roof pose composition. The roof
  hit resolver + overlap guard moved to @pascal-app/editor (the
  coordinator lives there; nodes already depends on editor).
- Cuts: subtractAccessoryCuts extracted and applied in BOTH the
  merged-shell and per-segment CSG paths (full edit mode / painted
  segments used to lose every hole), built from the CURRENT host
  geometry and live-effective children so holes follow segment and
  opening drags.
- Handle rig: the grandparent portal now maps the node's world pose
  into the portal frame instead of composing parent+node registry
  poses — correct for any nesting (the face-frame group broke the
  old assumption), identical for walls.
- Host-field hygiene: useDraftNode.commit/adopt and the window panel
  duplicate forward roofSegmentId/roofFace/wallId; every roof↔wall
  re-anchor clears and every revert restores them.

Codex-reviewed (design consultation, adversarial rounds on the
replaced cascade and on this refactor); frame conventions locked by
unit tests. Record: private-editor plans/editor-roof-wall-openings.md.

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

packages/nodes/src/item/renderer.tsx

@@ -33,6 +33,7 @@ import { Suspense, useEffect, useMemo, useRef } from 'react'
 import type { AnimationAction, Group, Material, Mesh } from 'three'
 import { MathUtils } from 'three'
 import { positionLocal, smoothstep, time } from 'three/tsl'
+import { RoofFaceHostFrame } from '../shared/roof-face-host'
 
 type MutableMaterial = Material & {
   depthTest?: boolean
@@ -92,7 +93,7 @@ export const ItemRenderer = ({ node: storeNode }: { node: ItemNode }) => {
     [storeNode, liveOverrides],
   )
 
-  return (
+  const content = (
     <group position={node.position} ref={ref} rotation={node.rotation} visible={node.visible}>
       <ErrorBoundary fallback={<BrokenItemFallback node={node} />}>
         <Suspense fallback={<PreviewModel node={node} />}>
@@ -104,6 +105,13 @@ export const ItemRenderer = ({ node: storeNode }: { node: ItemNode }) => {
       ))}
     </group>
   )
+
+  if (!node.roofSegmentId) return content
+  return (
+    <RoofFaceHostFrame roofFace={node.roofFace} roofSegmentId={node.roofSegmentId}>
+      {content}
+    </RoofFaceHostFrame>
+  )
 }
 
 const previewOpacity = smoothstep(0.42, 0.55, positionLocal.y.add(time.mul(-0.2)).mul(10).fract())