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/4.0/bpy.path.json

@@ -0,0 +1,22 @@
+{
+  "abspath": {
+    "params": {
+      "path": "str | bytes"
+    }
+  },
+  "basename": {
+    "params": {
+      "path": "str | bytes"
+    }
+  },
+  "is_subdir": {
+    "params": {
+      "directory": "str | bytes"
+    }
+  },
+  "native_pathsep": {
+    "params": {
+      "path": "str | bytes"
+    }
+  }
+}