feat: establish reproducible FreeCAD web compatibility baseline

config/chrome-sketcher-bspline-verification.json

@@ -0,0 +1,65 @@
+{
+  "schemaVersion": 1,
+  "browserId": "chrome",
+  "crossOriginIsolated": true,
+  "status": "pass",
+  "edit": {
+    "stableId": true,
+    "degree": 1,
+    "poleCount": 3,
+    "middlePole": {
+      "x": 2,
+      "y": 3
+    },
+    "weights": [
+      1,
+      0.5,
+      1
+    ],
+    "knots": [
+      0,
+      0,
+      0.5,
+      1,
+      1
+    ],
+    "periodic": true,
+    "sourceUnchanged": true
+  },
+  "validationErrors": {
+    "invalidWeight": "spline weights must be positive finite values matching control points.",
+    "invalidKnots": "spline knots must be non-decreasing and have controlPointCount + degree + 1 entries.",
+    "invalidDegree": "spline requires at least degree + 1 control points."
+  },
+  "roundTrip": {
+    "archiveBytes": 1493,
+    "geometryEqual": true,
+    "constraintsEqual": true,
+    "constraintTypes": [
+      "weight",
+      "internalAlignment",
+      "weight"
+    ],
+    "weights": [
+      1,
+      1.5,
+      1.25,
+      1
+    ],
+    "knots": [
+      0,
+      0,
+      0,
+      0,
+      1,
+      1,
+      1,
+      1
+    ]
+  },
+  "opfs": {
+    "markerSuite": "SK-10",
+    "markerFields": 8,
+    "markerRemoved": true
+  }
+}