feat: establish facade-first runtime boundary

config/freecad-baseline.json

@@ -0,0 +1,10 @@
+{
+  "baselineId": "freecad-1.1.1",
+  "freecadVersion": "1.1.1",
+  "sourceRef": "FreeCAD-1.1.1",
+  "sourceUrl": "https://github.com/FreeCAD/FreeCAD/releases/tag/1.1.1",
+  "uiContract": "FreeCAD official desktop UI and Developers Handbook",
+  "compatibilityLevels": ["exact", "compatible", "read-only", "proxy", "unsupported"],
+  "status": "baseline-pending-source-verification",
+  "notes": "The exact source commit and build flags must be recorded by P0-01 before geometry implementation."
+}