fix(skills): restore dist to files array after intent edit-package-json overwrote it

intent edit-package-json replaced "files": ["skills"] instead of appending, excluding dist/ from runtime and react-core published packages. publint caught it (pkg.exports.[].import/require -> file not published). Restoring dist + skills.

a2ui-renderer was unaffected (had existing "files": ["dist"] which got appended correctly).

Author: AlemTuzlak

packages/react-core/package.json

@@ -22,6 +22,7 @@
     "url": "https://github.com/CopilotKit/CopilotKit.git"
   },
   "files": [
+    "dist",
     "skills"
   ],
   "type": "module",

packages/runtime/package.json

@@ -22,6 +22,7 @@
     "url": "https://github.com/CopilotKit/CopilotKit.git"
   },
   "files": [
+    "dist",
     "skills"
   ],
   "sideEffects": [