feat(core,tui,app-server) personality migration (#10307)

## Summary
Keep existing users on Pragmatic, to preserve behavior while new users
default to Friendly

## Testing
- [x] Tested locally
- [x] add integration tests

codex-rs/tui/src/lib.rs

@@ -209,6 +209,13 @@ pub async fn run_main(
         }
     };
 
+    if let Err(err) =
+        codex_core::personality_migration::maybe_migrate_personality(&codex_home, &config_toml)
+            .await
+    {
+        tracing::warn!(error = %err, "failed to run personality migration");
+    }
+
     let cloud_auth_manager = AuthManager::shared(
         codex_home.to_path_buf(),
         false,