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/definition.ts

@@ -206,12 +206,13 @@ export const itemDefinition: NodeDefinition<typeof ItemNode> = {
     // siblings of GLB items inside the unified `items` table.
     //
     // Items can be hosted on walls (assets with `attachTo: 'wall'`)
-    // via `wallId` + `wallT`. When a composition that includes a
-    // wall-hosted item is saved as a preset (a sconce, a hanging
-    // shelf, etc.), the host app strips these via `getHostRefFields(def)`
-    // so the descendant re-attaches against the new wall geometry at
+    // via `wallId` + `wallT`, or on a roof-segment wall face via
+    // `roofSegmentId`. When a composition that includes a wall-hosted
+    // item is saved as a preset (a sconce, a hanging shelf, etc.), the
+    // host app strips these via `getHostRefFields(def)` so the
+    // descendant re-attaches against the new host geometry at
     // placement time.
-    hostRefFields: ['wallId', 'wallT'],
+    hostRefFields: ['wallId', 'wallT', 'roofSegmentId', 'roofFace'],
     // Floor items get lifted by slabs underneath via the generic
     // `<FloorElevationSystem>`. Wall- / ceiling-attached items live in
     // their parent's local frame and skip the lift via `applies`.