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/nodes/src/door/floorplan-move.ts

@@ -8,6 +8,10 @@ import {
 } from '@pascal-app/core'
 import { snapToHalf } from '@pascal-app/editor'
 import { createFloorplanCursorResolver } from '../shared/floorplan-cursor'
+import {
+  getRoofHostedOpeningLevelId,
+  getRoofHostedOpeningPlanPoint,
+} from '../shared/roof-opening-host'
 import {
   findClosestWallInPlan,
   projectWallLocalPointToPlan,
@@ -35,11 +39,13 @@ export const doorFloorplanMoveTarget: FloorplanMoveTarget<DoorNode> = ({ node })
   // Snapshot of the door's "valid" state at move-start — used by
   // canCommit to decide whether the current snapped position is OK.
   const startLevelId = (() => {
-    // Walk up via parentId until we hit a node whose type isn't 'wall'
-    // — that's the level (or null). The door is wall-hosted, so the
-    // wall's parent is the level. Cached at start because the parent
-    // chain doesn't change during a move.
-    const wall = useScene.getState().nodes[node.parentId as AnyNodeId]
+    // Wall-hosted: the wall's parent is the level. Roof-hosted: walk
+    // segment → roof → level. Cached at start because the parent chain
+    // doesn't change during a move.
+    const nodes = useScene.getState().nodes
+    const roofLevelId = getRoofHostedOpeningLevelId(node, nodes)
+    if (roofLevelId) return roofLevelId
+    const wall = nodes[node.parentId as AnyNodeId]
     return wall ? (wall.parentId as AnyNodeId | null) : null
   })()
   const originalWall = node.parentId
@@ -49,7 +55,10 @@ export const doorFloorplanMoveTarget: FloorplanMoveTarget<DoorNode> = ({ node })
     original:
       originalWall?.type === 'wall'
         ? projectWallLocalPointToPlan(originalWall, node.position[0])
-        : [node.position[0], 0],
+        : (getRoofHostedOpeningPlanPoint(node, useScene.getState().nodes) ?? [
+            node.position[0],
+            0,
+          ]),
     metadata: node.metadata,
   })
 
@@ -62,6 +71,7 @@ export const doorFloorplanMoveTarget: FloorplanMoveTarget<DoorNode> = ({ node })
     side: DoorNode['side']
     parentId: string
     wallId: string
+    roofSegmentId: undefined
   } | null = null
 
   const session: FloorplanMoveTargetSession = {
@@ -94,6 +104,9 @@ export const doorFloorplanMoveTarget: FloorplanMoveTarget<DoorNode> = ({ node })
         side: hit.side,
         parentId: hit.wall.id,
         wallId: hit.wall.id,
+        // Re-anchoring to a wall ends any roof-segment hosting; the
+        // overlay's snapshot restores it if the move is reverted.
+        roofSegmentId: undefined,
       }
 
       // Build the updates atomically — position + rotation + side +