feat: establish reproducible FreeCAD web compatibility baseline

config/freecad-parameter-mutation-plan.json

@@ -0,0 +1,21 @@
+{
+  "schemaVersion": 1,
+  "baselineId": "freecad-1.1.1",
+  "sourceCommit": "0108fd4b4850cc46e625b60e53cea7a7bbe69f8d",
+  "coveragePlan": "config/freecad-golden-coverage-plan.json",
+  "dimensions": [
+    "nominal-parameter-set",
+    "invalid-boundary",
+    "parameter-variant",
+    "edit-recompute-recovery",
+    "fcstd-roundtrip"
+  ],
+  "completionRule": "A family is complete only when every dimension has native or browser evidence tied to an explicit parameter snapshot and the edited/recovered Shape is valid.",
+  "evidenceRules": {
+    "fixture": "A success/failure fixture proves only the corresponding nominal or invalid boundary state.",
+    "parameterVariant": "Two or more distinct native/browser parameter snapshots are required; outcome-only records do not count.",
+    "editRecomputeRecovery": "The report must contain before, edited, recomputed and restored/recovered states from a real runtime transaction.",
+    "fcstdRoundtrip": "Every family round-trip id listed by the coverage plan must pass with zero differences."
+  },
+  "failClosed": true
+}