Add overrides to all versions and fix 4.3 temp_override hang

- Copy gpu.state, bpy.path, gpu.types overrides to 4.0-4.5
- Add bpy.msgbus override for 4.5
- Skip temp_override probe on Blender < 4.4 (hangs on 4.3)
- Fix _is_getset_writable to use docstring hints instead of __set__ probe

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

overrides/4.2/gpu.state.json

@@ -0,0 +1,8 @@
+{
+  "active_framebuffer_get": {
+    "return_type": "gpu.types.GPUFrameBuffer"
+  },
+  "viewport_get": {
+    "return_type": "tuple[int, int, int, int]"
+  }
+}