ocs_doc_api: Phase 2c-ii — dimension sub-types (radius/diameter/angular)

- CreateDimensionRadius/CreateDimensionDiameter (DimensionRadialSpec) +
  CreateDimensionAngular (DimensionAngularSpec) ops (append-only).
- backend add_dimension_radius/diameter (DimensionRadius/DimensionDiameter::new)
  + add_dimension_angular (DimensionAngular3Pt::new computes angle);
  dimension_measurement returns degrees for angular sub-types.
- facade create_dimension_radius/diameter/angular; spec constructors; api_reference
  + binding_schema regenerated; mocks + baseline.
- Test phase2cii_dimension_radius_diameter_angular -> 613 host lib + 3 consistency green.

crates/ocs_doc_api/spec/entities.toml

@@ -331,6 +331,21 @@ name = "create_dimension_linear"
 args = [{ name = "first_point", ty = "[f64; 3]" }, { name = "second_point", ty = "[f64; 3]" }, { name = "definition_point", ty = "[f64; 3]" }]
 op = "CreateDimensionLinear"
 
+[[family.constructor]]
+name = "create_dimension_radius"
+args = [{ name = "center", ty = "[f64; 3]" }, { name = "point", ty = "[f64; 3]" }]
+op = "CreateDimensionRadius"
+
+[[family.constructor]]
+name = "create_dimension_diameter"
+args = [{ name = "center", ty = "[f64; 3]" }, { name = "point", ty = "[f64; 3]" }]
+op = "CreateDimensionDiameter"
+
+[[family.constructor]]
+name = "create_dimension_angular"
+args = [{ name = "vertex", ty = "[f64; 3]" }, { name = "first_point", ty = "[f64; 3]" }, { name = "second_point", ty = "[f64; 3]" }, { name = "arc_location", ty = "[f64; 3]" }]
+op = "CreateDimensionAngular"
+
 [[family.method]]
 name = "measurement"
 kind = "query"