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/wall/definition.ts

@@ -57,14 +57,14 @@ export const wallDefinition: NodeDefinition<typeof WallNode> = {
 
   parametrics: wallParametrics,
 
-  // Stage D — deferred for wall. The curve port (`curve-tool.tsx` +
-  // `actions/curve.ts`) needs more work to match the legacy
-  // CurveWallTool's UX (pre-snap on pointer position, 0.5m grid step,
-  // Shift override, smooth scene.update without cascade overhead).
-  // Legacy fallback runs until that lands. Endpoint move / whole-wall
-  // move / placement are all still legacy too — they're the biggest
-  // tools and have linked-wall corner cascade logic that needs a
-  // careful port.
+  // Stage D — wall curve is a 1:1 port of the legacy CurveWallTool,
+  // relocated into this folder and dispatched via the registry. Endpoint
+  // move (linked-wall corner cascade + ALT-detach), whole-wall move, and
+  // placement are still legacy — they're substantially larger and queued
+  // for separate port passes.
+  affordanceTools: {
+    curve: () => import('./curve-tool'),
+  },
 
   renderer: {
     kind: 'parametric',