feat: integrate SimpleCADAPI 2.0.2 CAD workflows

SimpleCADAPI/docs/api/canonical_unit_for_dimension.md

@@ -0,0 +1,19 @@
+# canonical_unit_for_dimension
+
+## API Definition
+
+```python
+def canonical_unit_for_dimension(dimension: Dimension) -> Unit
+```
+
+*Source: units.py*
+
+## Import Surface
+
+- top-level: `from simplecadapi import canonical_unit_for_dimension`
+
+## Description
+
+Return the canonical unit used by CAD and tolerance calculations.
+
+Length, area, volume, and angle use ``mm``, ``mm^2``, ``mm^3``, and ``deg``.