Import CAD projects and cad-router v1

CADDesigner-Code/workspace/skills/simplecad-self-evolve/references/docs/api/value.md

@@ -0,0 +1,36 @@
+# value
+
+## API Definition
+
+```python
+def value(path: str, default: Any = None) -> KeyFn
+```
+
+*Source: ql.py*
+
+## Description
+
+Build a value getter for sorting or projection.
+
+Q.select(items).order_by(Q.value("geo.height"))
+
+## Parameters
+
+### path
+
+- **Description**: Metadata path, for example `geo.height`.
+
+### default
+
+- **Description**: Default value when lookup fails.
+
+## Returns
+
+Callable[[Any], Any]: Getter function.
+
+## Examples
+
+```python
+key = Q.value("geo.height", 0.0)
+height = key(obj)
+```