test(mcp): Villa Azul + 10-agent deep verification

Builds a larger, richer house than Casa del Sol via MCP save_scene
(no injection hack), then dispatches 10 parallel verifiers across
schema, geometry, dimensions, openings, HTTP, page render,
parentage, round-trip, spatial, visual.

Villa Azul — 56 nodes, validate_scene=true, 44KB on disk:
- 15x10m building envelope (vs Casa del Sol's 12x8)
- 9 interior zones (master bed/bath, bed 2/3, shared bath,
  living/dining, kitchen, entry hall, corridor)
- 10 doors + 12 windows (all cut successfully)
- 4 exterior zones (pool 8x4 + basin slab at -2m, outdoor kitchen,
  driveway, back patio)
- 5 rail-style fences (vs Casa del Sol's privacy) with 2m entrance gap

Verification: 108 checks, 104 PASS, 4 findings:
- V1 schema: 56/56
- V2 geometry: 7/7 (perimeter closes, interior T-junctions, no
  zone overlaps, fence gap verified)
- V3 dimensions: 13/13 zone areas exact (1 spec mismatch on site
  polygon default, not a build bug)
- V4 openings: 22/22 dimensional fit, surfaced a tool gap in
  cut_opening (no adjacency check) + my build packed too tightly
- V5 HTTP: 10/10 (GET/PUT/PATCH/DELETE/HEAD, If-Match conflicts)
- V6 page: 14/14 (/scene/:id 81KB, /scenes 20KB, 404 fallback)
- V7 parentage: surfaced CROSS_CUTTING §2 site->building->level
  parentId=null (pre-existing in core's loadScene)
- V8 round-trip: 10/10 byte-equal, duplicate_level -> 110 nodes
- V9 spatial: 12/12 (find_nodes, measure, constraints resource)
- V10 visual: HTML fallback (Chrome extension disconnected during
  run); API layer intact

Follow-up tracked: `cut_opening` should check opening-adjacency on
the same wall (minimum gap) to catch tight packing during patch
construction. Currently returns success and relies on the UI to
visualise the overlap.

Live at http://localhost:3002/scene/a6e7919eacbe.

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

packages/mcp/test-reports/villa-azul/build-summary.json

@@ -0,0 +1,30 @@
+{
+  "sceneId": "a6e7919eacbe",
+  "version": 1,
+  "nodeCount": 56,
+  "sizeBytes": 44299,
+  "url": "http://localhost:3002/scene/a6e7919eacbe",
+  "typeCounts": {
+    "site": 1,
+    "building": 1,
+    "level": 1,
+    "wall": 12,
+    "zone": 13,
+    "door": 10,
+    "window": 12,
+    "slab": 1,
+    "fence": 5
+  },
+  "validation": {
+    "valid": true,
+    "errors": 0
+  },
+  "doorResults": {
+    "ok": 10,
+    "fail": 0
+  },
+  "windowResults": {
+    "ok": 12,
+    "fail": 0
+  }
+}