Add three-axis milling with independent CAM and Fusion validation (#1682)

Thanks @CypherNaught-0x.

Cargo.toml

@@ -14,6 +14,7 @@ repository = "https://github.com/bherbruck/solidcraft"
 
 [workspace.dependencies]
 # internal
+solidcraft-cam = { path = "crates/cam" }
 solidcraft-geom = { path = "crates/geom" }
 solidcraft-sketch = { path = "crates/sketch" }
 solidcraft-kernel = { path = "crates/kernel" }