feat: integrate SimpleCADAPI 2.0.2 CAD workflows

text-to-cad/skills/cad-router/scripts/capabilities.json

@@ -1,5 +1,21 @@
 {
-  "schema_version": "1.0",
+  "schema_version": "2.0",
+  "routing_policy": {
+    "default_backend": null,
+    "selection_basis": [
+      "native source continuity",
+      "standard factory coverage",
+      "semantic and replay requirements",
+      "geometry vocabulary coverage",
+      "assembly requirements",
+      "validation requirements"
+    ],
+    "uploaded_step_execution_engine": "surfaceir",
+    "uploaded_step_validation_engines": [
+      "surfaceir_geometry_acceptance",
+      "simplecadapi_brep_compare"
+    ]
+  },
   "backends": {
     "build123d": {
       "project": "text-to-cad",
@@ -10,21 +26,43 @@
         "general mechanical parts",
         "machined features",
         "source-level assemblies",
-        "existing STEP inspection and modification",
+        "freeform profiles, lofts, sweeps, and mixed surface workflows",
         "geometry measurement and validation"
       ],
+      "preferred_when": [
+        "the part is a custom bracket, housing, shaft, flange, fixture, or enclosure",
+        "source-level assembly mates or existing build123d Python must be preserved",
+        "the geometry needs custom profiles or surface-heavy construction not covered by a SimpleCADAPI factory"
+      ],
+      "weak_when": [
+        "a deterministic SimpleCADAPI standard factory covers the requested part",
+        "operation-graph replay, typed semantic tags, units, or tolerance chains are primary requirements"
+      ],
       "source_of_truth": "build123d Python generator"
     },
     "simplecadapi": {
       "project": "SimpleCADAPI",
       "runner_skill": "simplecadapi",
+      "minimum_version": "2.0.2",
       "source_formats": ["py", "json"],
       "primary_formats": ["step", "stp"],
       "strengths": [
-        "gears, ring gears, racks, and cycloidal discs",
-        "bearings, reducers, and joint actuators",
-        "replayable operation graphs",
-        "semantic tags and topology queries"
+        "gears, ring gears, racks, bevel gears, and cycloidal discs",
+        "bearings, bolts, nuts, roller-chain sprockets, reducers, and joint actuators",
+        "replayable ModelResult operation graphs and scene packages",
+        "typed semantic tags, topology lineage, and source mapping",
+        "physical units and tolerance-chain validation",
+        "STEP B-Rep inspection, strict comparison, and slice diagnostics",
+        "FreeCAD, Fusion 360, and SolidWorks translation"
+      ],
+      "preferred_when": [
+        "a standard mechanical factory directly covers the requested family",
+        "replayable model JSON, semantic edit anchors, units, tolerances, or CAD translation are required",
+        "a reusable mechanical product family should become a deterministic library function"
+      ],
+      "weak_when": [
+        "the request depends on complex freeform surfaces outside the supported operation vocabulary",
+        "an existing build123d generator or source-level build123d assembly must be preserved"
       ],
       "source_of_truth": "SimpleCADAPI Python generator and model JSON"
     }