feat: integrate SimpleCADAPI 2.0.2 CAD workflows

SimpleCADAPI/docs/api/infer_dimension.md

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+# infer_dimension
+
+## API Definition
+
+```python
+def infer_dimension(value: 'ScalarLike') -> Dimension | None
+```
+
+*Source: units.py*
+
+## Import Surface
+
+- top-level: `from simplecadapi import infer_dimension`
+
+## Description
+
+Infer and validate an expression's result dimension.
+
+``None`` means the expression uses only legacy variables without unit
+declarations. Expressions that contain explicit units are validated
+strictly and cannot mix in legacy variables.