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/v5-http.md

@@ -0,0 +1,79 @@
+# Villa Azul — Phase 9 Verifier V5 (HTTP round-trip)
+
+- Date: 2026-04-18
+- Base URL: http://localhost:3002
+- Scene ID: a6e7919eacbe
+- Result: ALL PASS (10/10)
+
+## HTTP Status Code Matrix
+
+| # | Check | HTTP | Status |
+|---|---|---|---|
+| 01 | GET /api/scenes lists Villa Azul | 200 | PASS |
+| 02 | GET /api/scenes/:id headers+shape | 200 | PASS |
+| 03 | nodeCount & graph.nodes keys === 56 | 200 | PASS |
+| 04 | type counts match build summary | 200 | PASS |
+| 05 | 404 not_found on bad id | 404 | PASS |
+| 06 | GET /api/scenes?limit=1 returns 1 | 200 | PASS |
+| 07 | HEAD /api/scenes/:id behavior | 200 | PASS |
+| 08a | PATCH rename with If-Match:"1" → v=2 | 200 | PASS |
+| 08b | PATCH revert with If-Match:"2" → v=3 | 200 | PASS |
+| 09 | PUT with stale If-Match:"1" → 409 | 409 | PASS |
+
+## Details
+
+### 01 GET /api/scenes lists Villa Azul
+- HTTP: 200
+- Status: PASS
+- Details: found=true name=Villa Azul total=1
+
+### 02 GET /api/scenes/:id headers+shape
+- HTTP: 200
+- Status: PASS
+- Details: ETag="1" Content-Type=application/json
+
+### 03 nodeCount & graph.nodes keys === 56
+- HTTP: 200
+- Status: PASS
+- Details: nodeCount=56 keys=56
+
+### 04 type counts match build summary
+- HTTP: 200
+- Status: PASS
+- Details: {"site":1,"building":1,"level":1,"wall":12,"zone":13,"door":10,"window":12,"slab":1,"fence":5}
+
+### 05 404 not_found on bad id
+- HTTP: 404
+- Status: PASS
+- Details: body={"error":"not_found"}
+
+### 06 GET /api/scenes?limit=1 returns 1
+- HTTP: 200
+- Status: PASS
+- Details: count=1
+
+### 07 HEAD /api/scenes/:id behavior
+- HTTP: 200
+- Status: PASS
+- Details: HEAD returned 200 (supported)
+
+### 08a PATCH rename with If-Match:"1" → v=2
+- HTTP: 200
+- Status: PASS
+- Details: name=Villa Azul renamed version=2
+
+### 08b PATCH revert with If-Match:"2" → v=3
+- HTTP: 200
+- Status: PASS
+- Details: name=Villa Azul version=3
+
+### 09 PUT with stale If-Match:"1" → 409
+- HTTP: 409
+- Status: PASS
+- Details: body={"error":"version_conflict","currentVersion":3}
+
+## Notes
+
+- HEAD /api/scenes/:id returned **200** — supported (Next.js returns HEAD for GET handlers by default).
+- Final scene version after PATCH sequence: **3** (was 1; bumped to 2 then 3). The name was restored to 'Villa Azul' so downstream verifiers see the original name.
+- PUT with stale If-Match "1" returned **409** (expected 409 since version is now 3).