Add bpy.msgbus key override for 4.5

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

overrides/4.5/bpy.msgbus.json

@@ -0,0 +1,12 @@
+{
+  "subscribe_rna": {
+    "params": {
+      "key": "bpy.types.Property | bpy.types.Struct | tuple[bpy.types.Struct, str] | object"
+    }
+  },
+  "publish_rna": {
+    "params": {
+      "key": "bpy.types.Property | bpy.types.Struct | tuple[bpy.types.Struct, str] | object"
+    }
+  }
+}