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/v8-roundtrip.md

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+# Villa Azul — V8 Load-Save Round-Trip Report
+
+- Generated: 2026-04-19T18:37:01.857Z
+- Shared source: `/tmp/pascal-villa/scenes/a6e7919eacbe.json`
+- Isolated data dir: `/tmp/pascal-villa-v8`
+- Transport: stdio (`bun /Users/adrian/Desktop/editor/.worktrees/mcp-server/packages/mcp/dist/bin/pascal-mcp.js --stdio`)
+- New sceneId (copy): `d346bd83beb9`
+- Rebuilt sceneId (apply_patch): `0a264e09564f`
+- Duplicated sceneId: `db09cfe4a8fc`
+
+## Original node-type counts
+
+| Type | Count |
+|---|---:|
+| building | 1 |
+| door | 10 |
+| fence | 5 |
+| level | 1 |
+| site | 1 |
+| slab | 1 |
+| wall | 12 |
+| window | 12 |
+| zone | 13 |
+| **total** | **56** |
+
+## Results
+
+| # | Check | Status | Detail |
+|---|---|:---:|---|
+| 1 | 1.read-original | PASS | nodes=56, roots=1, types={"site":1,"building":1,"level":1,"wall":12,"zone":13,"door":10,"window":12,"slab":1,"fence":5} |
+| 2 | 2.spawn-isolated-stdio | PASS | PASCAL_DATA_DIR=/tmp/pascal-villa-v8 |
+| 3 | 3.save_scene(copy) | PASS | id=d346bd83beb9 version=1 nodes=56 bytes=44285 |
+| 4 | 4a.load→get_scene ids preserved | PASS | 56 ids, match=true |
+| 5 | 4b.load→get_scene rootNodeIds | PASS | orig=[site_5mzaasm5o9a9d0sf] loaded=[site_5mzaasm5o9a9d0sf] |
+| 6 | 4c.load→get_scene deep-equal per-node | PASS | diffs=0 |
+| 7 | 5.apply_patch rebuild counts | PASS | ops=53 created=53 total=56 diffs=none |
+| 8 | 6.duplicate_level + save + reload counts | PASS | valid=true new=54 total=110 diffs=none |
+| 9 | 7.stableStringify(orig.nodes) === stableStringify(reloaded.nodes) | PASS | orig=23333ch reloaded=23333ch equal=true |
+| 10 | 7b.on-disk isolated file graph === shared file graph | PASS | path=/tmp/pascal-villa-v8/scenes/d346bd83beb9.json equal=true |
+
+## Summary
+
+- Passed: **10/10**
+- Failed: **0/10**
+- Overall: **PASS**
+
+## Original vs loaded-after-save — per-type count diff
+
+| Type | Original | Loaded | Match |
+|---|---:|---:|:---:|
+| building | 1 | 1 | YES |
+| door | 10 | 10 | YES |
+| fence | 5 | 5 | YES |
+| level | 1 | 1 | YES |
+| site | 1 | 1 | YES |
+| slab | 1 | 1 | YES |
+| wall | 12 | 12 | YES |
+| window | 12 | 12 | YES |
+| zone | 13 | 13 | YES |
+
+## Notes
+
+- `save_scene({ includeCurrentScene: false, graph })` should persist the graph verbatim, preserving all node ids.
+- `stableStringify` normalises key order so byte equality is order-independent; this is the canonical "deep-equal" check here.
+- Step 5 rebuilds the scene by save/load-ing a shell (site+building+level) then replaying every remaining node as an `apply_patch` `create` op. Only counts-per-type are compared (node ids on the rebuild will equal the originals because we reuse the same ids in the patches).
+- Step 6 exercises `duplicate_level` against the copied scene; the site/building remain shared (count=1), while per-level types should double.