feat(mcp): implement 19 scene query and mutation tools

Scene querying: get_scene, get_node, describe_node, find_nodes, measure.
Scene mutation (undoable, atomic): apply_patch, create_level, create_wall,
place_item, cut_opening, set_zone, duplicate_level, delete_node.
Undo/redo: undo, redo.
Export: export_json, export_glb (not_implemented stub).
Validation: validate_scene, check_collisions.

Each tool has:
- Exported Zod input + output schemas
- register<Tool>(server, bridge) wiring function
- Bun test with happy-path + error-path coverage via InMemoryTransport

59 tool tests, all passing end-to-end through MCP protocol.

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

packages/mcp/src/tools/index.ts

@@ -0,0 +1,48 @@
+import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
+import type { SceneBridge } from '../bridge/scene-bridge'
+import { registerApplyPatch } from './apply-patch'
+import { registerCheckCollisions } from './check-collisions'
+import { registerCreateLevel } from './create-level'
+import { registerCreateWall } from './create-wall'
+import { registerCutOpening } from './cut-opening'
+import { registerDeleteNode } from './delete-node'
+import { registerDescribeNode } from './describe-node'
+import { registerDuplicateLevel } from './duplicate-level'
+import { registerExportGlb } from './export-glb'
+import { registerExportJson } from './export-json'
+import { registerFindNodes } from './find-nodes'
+import { registerGetNode } from './get-node'
+import { registerGetScene } from './get-scene'
+import { registerMeasure } from './measure'
+import { registerPlaceItem } from './place-item'
+import { registerRedo } from './redo'
+import { registerSetZone } from './set-zone'
+import { registerUndo } from './undo'
+import { registerValidateScene } from './validate-scene'
+
+/**
+ * Register every non-vision MCP tool against the given server.
+ * Vision tools (analyze_floorplan_image, analyze_room_photo) are registered
+ * separately via `registerVisionTools` (Agent E).
+ */
+export function registerTools(server: McpServer, bridge: SceneBridge): void {
+  registerGetScene(server, bridge)
+  registerGetNode(server, bridge)
+  registerDescribeNode(server, bridge)
+  registerFindNodes(server, bridge)
+  registerMeasure(server, bridge)
+  registerApplyPatch(server, bridge)
+  registerCreateLevel(server, bridge)
+  registerCreateWall(server, bridge)
+  registerPlaceItem(server, bridge)
+  registerCutOpening(server, bridge)
+  registerSetZone(server, bridge)
+  registerDuplicateLevel(server, bridge)
+  registerDeleteNode(server, bridge)
+  registerUndo(server, bridge)
+  registerRedo(server, bridge)
+  registerExportJson(server, bridge)
+  registerExportGlb(server, bridge)
+  registerValidateScene(server, bridge)
+  registerCheckCollisions(server, bridge)
+}