feat: convert PyVector to use documentation macros

Converts magnitude, normalize, and dot methods to MCRF_METHOD macro.
Docstrings now include complete Args/Returns/Raises sections.
Addresses issue #92.

tools/test_vector_docs.py

@@ -0,0 +1,19 @@
+import mcrfpy
+import sys
+
+# Check Vector.magnitude docstring
+mag_doc = mcrfpy.Vector.magnitude.__doc__
+print("magnitude doc:", mag_doc)
+assert "magnitude()" in mag_doc
+assert "Calculate the length/magnitude" in mag_doc
+assert "Returns:" in mag_doc
+
+# Check Vector.dot docstring
+dot_doc = mcrfpy.Vector.dot.__doc__
+print("dot doc:", dot_doc)
+assert "dot(other: Vector)" in dot_doc
+assert "Args:" in dot_doc
+assert "other:" in dot_doc
+
+print("SUCCESS: All docstrings present and complete")
+sys.exit(0)