Add dunder methods, hidden type discovery, uniform_float override, and docstring fixes

- Introspect dunder methods (__getitem__, __len__, __add__, __matmul__, etc.)
  on C extension classes with runtime probing for return types
- Discover hidden C types from property values (e.g. MatrixAccess from Matrix.col)
- Add gpu.types override for uniform_float to accept Matrix, Vector, Euler,
  Quaternion, and Color (matching Blender's mathutils_array_parse C implementation)
- Extend apply_overrides to support ClassName.method_name keys for struct methods
- Parse standalone :type: annotations in property docstrings (is_frozen -> bool)
- Strip (readonly) and (never None) from docstring type annotations
- Add :raises to directive lookahead to prevent rtype bleeding into raises text
- Fix NoneType -> None normalization in runtime type probing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

overrides/5.0/gpu.types.json

@@ -0,0 +1,7 @@
+{
+  "GPUShader.uniform_float": {
+    "params": {
+      "value": "float | int | Sequence[float] | mathutils.Matrix | mathutils.Vector | mathutils.Euler | mathutils.Quaternion | mathutils.Color"
+    }
+  }
+}