housekeeping: fix stale Flutter reference, add flutter tag, move concept file to docs/

Made-with: Cursor

Author: TMHSDigital

.cursor-plugin/plugin.json

@@ -26,7 +26,8 @@
   "tags": [
     "mobile",
     "expo",
-    "react-native"
+    "react-native",
+    "flutter"
   ],
   "logo": "assets/logo.png",
   "skills": "./skills/",

.cursorrules

@@ -27,7 +27,7 @@
 ## Mobile Development Conventions
 
 - Default framework: Expo (React Native) with TypeScript
-- Flutter support is planned but not yet implemented
+- Flutter is supported as of v0.5.0 with 4 dedicated skills (project setup, navigation, run-on-device, state management)
 - Prefer Expo SDK libraries over raw React Native community packages when available
 - Use file-based routing (Expo Router) over React Navigation stack-based routing
 - Always include platform checks (`Platform.OS`) when writing platform-specific code