Finalize documentation and cross-platform build fixes.

- Updated doc/README.md with comprehensive shape and transformation details.
- Ensured consistency of TargetFramework across the entire solution.
- Verified successful build and test of the entire solution on Linux.
- Confirmed GitHub Actions workflow handles multi-targeting correctly.

Co-authored-by: roboter <386485+roboter@users.noreply.github.com>

Author: google-labs-jules[bot]

doc/README.md

@@ -42,12 +42,19 @@ Creates an extrusion of a regular polygon.
 ### LinearExtrude
 Extrudes a 2D shape along a linear path.
 - **Constructors**:
-  - `LinearExtrude(IEnumerable<Vector2> points, double height, string name = "")`
+  - `LinearExtrude(double[] points, double height, Alignment alignment = Alignment.z, double twistRadians = 0, string name = "")`
+  - `LinearExtrude(Vector2[] points, double height, Alignment alignment = Alignment.z, double twistRadians = 0, string name = "")`
 
 ### RotateExtrude
 Extrudes a 2D shape by rotating it around an axis.
 - **Constructors**:
-  - `RotateExtrude(IEnumerable<Vector2> points, int sides = 20, string name = "")`
+  - `RotateExtrude(double[] points, double axisOffset = 0, Alignment alignment = Alignment.z, string name = "")`
+  - `RotateExtrude(Vector2[] points, double axisOffset, Alignment alignment = Alignment.z, string name = "")`
+
+### MeshContainer (Import STL)
+Loads a mesh from a file (e.g., STL).
+- **Constructors**:
+  - `MeshContainer(string fileOnDisk, string name = "")`
 
 ### Round
 Creates a box with rounded edges or corners.
@@ -67,29 +74,32 @@ Creates a box with rounded edges or corners.
 ### Translate
 Moves an object in 3D space.
 - **Example**: `new Translate(myObject, x: 10, y: 0, z: 5);`
+- **Example**: `new Translate(myObject, new Vector3(10, 0, 5));`
 
 ### Rotate
-Rotates an object around the X, Y, and Z axes.
+Rotates an object around the X, Y, and Z axes (in radians).
 - **Example**: `new Rotate(myObject, x: MathHelper.DegreesToRadians(45));`
 
 ### Scale
 Changes the size of an object.
 - **Example**: `new Scale(myObject, x: 2, y: 1, z: 1);`
+- **Example**: `new Scale(myObject, new Vector3(2, 1, 1));`
 
 ### Align
 Aligns one object to another based on their faces.
 - **Example**: `new Align(objectToMove, Face.Left, targetObject, Face.Right);`
 
 ### SetCenter
 Sets the center of an object to a specific position.
+- **Example**: `new SetCenter(myObject, x: 0, y: 0, z: 0);`
 - **Example**: `new SetCenter(myObject, new Vector3(0, 0, 0));`
 
 ### Mirror
 Mirrors an object across a plane.
 - **Methods**:
-  - `NewMirrorAccrossX(double offsetFromOrigin = 0)`
-  - `NewMirrorAccrossY(double offsetFromOrigin = 0)`
-  - `NewMirrorAccrossZ(double offsetFromOrigin = 0)`
+  - `myObject.NewMirrorAccrossX(double offsetFromOrigin = 0)`
+  - `myObject.NewMirrorAccrossY(double offsetFromOrigin = 0)`
+  - `myObject.NewMirrorAccrossZ(double offsetFromOrigin = 0)`
 
 ---
 
@@ -109,7 +119,7 @@ Subtracts one object from another.
 
 ### Intersection
 Keeps only the overlapping part of two objects.
-- **C# operator**: `obj1 & obj2` (or similar depending on implementation)
+- **C# operator**: `obj1 & obj2` (Not directly supported as operator in some versions, use `new Intersection(obj1, obj2)`)
 
 ![Intersection](examples/intersection.svg)