Import CAD projects and cad-router v1

SimpleCADAPI/docs/api/get_sketch_entity_rsketchref.md

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+# get_sketch_entity_rsketchref
+
+## API Definition
+
+```python
+def get_sketch_entity_rsketchref(sketch: Sketch, entity_id: str) -> SketchRef
+```
+
+*Source: operations.py*
+
+## Import Surface
+
+- top-level: `from simplecadapi import get_sketch_entity_rsketchref`
+
+## Description
+
+Return a stable ref for a named sketch entity.