Import CAD projects and cad-router v1

SimpleCADAPI/docs/api/Var.md

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+# Var
+
+## Class Definition
+
+```python
+class Var(name: str, default: float, comment: str | None = None, expr_id: str = field(default_factory=lambda : _make_expr_id('var')))
+```
+
+*Source: expr.py*
+
+## Import Surface
+
+- top-level: `from simplecadapi import Var`
+
+## Description
+
+Named scalar parameter with a default fallback value.