Phase 5 Stage D: re-port curve + whole-item move tools 1:1 from legacy

Each tool is now a direct copy of the legacy implementation, relocated
under @pascal-app/nodes/<kind>/ and dispatched via the registry's
def.affordanceTools. No DragAction abstraction, no clever live-drag
exception, no novel snap pipeline — same code, same UX, same
performance, same history dance.

Ports:
- fence/curve-tool.tsx    (legacy CurveFenceTool, 1:1)
- fence/move-tool.tsx     (legacy MoveFenceTool, 1:1 — including
                           the mesh.position + useLiveTransforms
                           exception that the legacy uses for fence
                           specifically)
- wall/curve-tool.tsx     (legacy CurveWallTool, 1:1)
- slab/move-tool.tsx      (legacy MoveSlabTool, 1:1)
- ceiling/move-tool.tsx   (legacy MoveCeilingTool, 1:1 — preview
                           fill + outline overlay preserved)

Drops the obsolete DragAction-based action files
(packages/nodes/src/{fence,wall,slab,ceiling}/actions/{curve,move}.ts)
and their now-empty actions/ directories where applicable. Fence
keeps actions/move-endpoint.ts since that port works.

Editor public surface gains `getWallGridStep` + `snapScalarToGrid`
(transitional exports — Stage F moves them into @pascal-app/nodes).

ToolManager + MoveTool dispatch unchanged: the same legacy-fallback
branches now mount the registry component because the affordances are
declared, but the rendered behavior matches the legacy because the
implementations are copies.

Per-kind progress: fence D ✅ (curve / move-endpoint / move / placement
all kind-owned), slab D ✅, ceiling D ✅, wall D 🟡 (curve only,
endpoint/move/placement still legacy).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/nodes/src/fence/definition.ts

@@ -74,16 +74,15 @@ export const fenceDefinition: NodeDefinition<typeof FenceNode> = {
   // Legacy `floorplanFenceEntries` short-circuits to [] when fence is
   // registered (see floorplan-panel.tsx).
   floorplan: buildFenceFloorplan,
-  // Stage D — partial port. Endpoint drag (with linked-fence cascade,
-  // alt-detach, angle label) is ported here; curve + whole-fence move
-  // are intentionally kept on the legacy CurveFenceTool / MoveFenceTool
-  // because the legacy code is more polished than the ports were
-  // (cursor anchoring, snap step, performance, history). Those ports
-  // remain in `curve-tool.tsx` + `move-tool.tsx` + their `actions/`
-  // siblings for the next iteration; the legacy fallback runs until
-  // they reach parity.
+  // Stage D — all four fence drag-affordances live in this folder.
+  // curve / move-endpoint / move are 1:1 ports of the legacy tools
+  // (same snap pipeline, same history dance, same cursor render),
+  // relocated under `@pascal-app/nodes` and dispatched via
+  // `def.affordanceTools`. Placement lives in `def.tool` (see below).
   affordanceTools: {
+    curve: () => import('./curve-tool'),
     'move-endpoint': () => import('./move-endpoint-tool'),
+    move: () => import('./move-tool'),
   },
 
   toolHints: [