test: prove coincident partition acceptance

Issue: #276
User-Visible: no

docs/ARCHITECTURE.md

@@ -545,6 +545,11 @@ partial/composite matches, overlapping openings and adjacent independent
 bodies fail closed. The candidate then crosses the existing whole-plan
 geometry preflight and one atomic Optimize write/Undo boundary. No render or
 ordinary save path invokes this pass, so `PLAN_MODEL_VERSION` remains unchanged.
+`OptimizeDependencies` is a narrow test/benchmark seam: production uses the
+real helper, while the committed large-house benchmark substitutes a no-op to
+measure only this pass and the unit contract instruments its exact per-space
+call count. A source-ownership assertion fails if a render/pointer module ever
+imports the helper.
 
 `boundary` is one contextual UI tool over the existing `open_spans` model.
 Before the first click, independent physical bodies block the room boundary

docs/TESTING.md

@@ -2815,15 +2815,23 @@ require hands on real hardware — they remain for the human pass.
       exact independent wall is removed, its hosted door becomes an ordinary
       opening at the same centre/angle with all bindings and unknown fields,
       and the wider centred thickness survives. Direction and room order do
-      not matter; partial/extra/unknown/draft/column/opening-conflict cases are
-      byte-preserved. Preview writes nothing, Apply uses one WS transaction,
+      not matter; three non-overlapping hosted door/window/gate records are
+      rehosted atomically, while a hosted-hosted overlap and all other
+      partial/extra/unknown/draft/column/opening conflicts fail closed. Preview
+      writes nothing, Apply uses one WS transaction,
       reload is idempotent, Undo restores the hosted form, and Boundary plus
-      Thickness target the resulting shared wall [unit:
+      Thickness target the resulting shared wall. Four targeted golden scenes
+      retain the 5 cm offset and show before, 10 cm, 30 cm and virtual results;
+      the paired large-house benchmark enforces p95 overhead ≤15% and ≤25 ms,
+      while source ownership plus an injected counter keep the helper out of
+      render/pointer paths [unit:
       test/coincident-partitions.test.mjs + test/plan-optimizer.test.mjs;
       auto: smoke_optimize_coincident_partition; mutations:
       `optimizer-coincident-opening-rehost-disabled`,
       `optimizer-coincident-partial-accepted`, existing
-      `optimize-preflight-bypassed`].
+      `optimize-preflight-bypassed`; performance:
+      `npm run benchmark:coincident-partitions`; golden:
+      `coincident-partition-{before,thin,thick,virtual}-dark`].
 - [ ] **Unit + backend**: inset/mitre/bevel, key from either end, degrade,
       rekey, cm↔inches; `walls` schema bounds
       [auto: test/wall-thickness.test.mjs + tests_backend/test_validation.py]

docs/images/screenshots.json

@@ -2,7 +2,7 @@
   "version": 1,
   "fixture": "synthetic-only",
   "chromium": "151.0.7922.34",
-  "sourceFingerprint": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+  "sourceFingerprint": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
   "captureScriptSha256": "ce2e9542fed9dade3085be87d16f69adb2ac8262893ad78ad966b1b9673f2983",
   "command": "npm run build && node demo/docs/capture.mjs",
   "scenarios": {
@@ -14,7 +14,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
       "imageSha256": "5ba555c1f46416ce17e40ef2b6ecd9eb6e1d0ce6b8d467acd0682af95bd36307"
     },
     "view-touch": {
@@ -25,7 +25,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
       "imageSha256": "deaae14893e66337b42e45ccfe87cf16f571cfc10f98da4250a6a6589a092a43"
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     "space-create": {
@@ -36,7 +36,7 @@
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       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
       "imageSha256": "c33a7279165a4cec6fa6fadb6fd08cd967e082a17fe101ef442d27d36ae59b6b"
     },
     "room-contour-close": {
@@ -47,7 +47,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
       "imageSha256": "37f7e4f1d7601bc5c0fdfd38c6482a6af85c845c883283b9aba16d6457383355"
     },
     "plan-context-tray": {
@@ -58,7 +58,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
       "imageSha256": "b0398943d8a7c8215159d2d54b895c28feb1be8e303e65ca106ea5185c34644e"
     },
     "device-editor": {
@@ -69,8 +69,8 @@
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       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
-      "imageSha256": "c3704489b36fd4177e761124fac032d8d09d6a94e3110f9a77d40ec110c1590b"
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
+      "imageSha256": "f24da9380b83b4e0087f81dadbf1ca45df0395558baa0441ebb8c4b14584c899"
     },
     "device-display-preview": {
       "file": "06-device-display-preview.png",
@@ -80,7 +80,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
       "imageSha256": "7241478b3fae2a5b1895f241bc50a65f1aaacce907d311cc87796a251c389a8b"
     },
     "background-editor": {
@@ -91,7 +91,7 @@
       },
       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
       "imageSha256": "8241b09b0d821247a86eaadd6043a37dde29623c870d8a142bcd381c638a306d"
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     "room-card": {
@@ -102,7 +102,7 @@
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       "theme": "dark",
       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
       "imageSha256": "029a3e69ec647a8a370d99e6bb7f9225833c526739076022f6b52ba54bff30ea"
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@@ -113,7 +113,7 @@
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       "language": "en",
-      "sourceSha256": "ceb125adfd9b21b62821936055562a2864e7d57007694c16169f7bc7ffa383b4",
+      "sourceSha256": "06493179d9db0327626adb8a69fc7cdaf46e8e24f17dae066d93080e4ec0cedc",
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