fix: clean old config on agent reinstall

install script now removes old .env and config.json
prevents conflicts during reinstall/upgrade

addresses .env conflict errors reported in testing

aggregator-agent/install.sh

@@ -174,6 +174,18 @@ register_agent() {
     # Create config directory
     mkdir -p /etc/aggregator
 
+    # Clean up old configuration files (prevents conflicts during reinstall/upgrade)
+    if [ -f /etc/aggregator/.env ]; then
+        echo "Removing old .env file..."
+        rm -f /etc/aggregator/.env
+        echo "✓ Old .env file removed"
+    fi
+    if [ -f /etc/aggregator/config.json ]; then
+        echo "Removing old config.json file..."
+        rm -f /etc/aggregator/config.json
+        echo "✓ Old config.json file removed"
+    fi
+
     # Set SELinux context for config directory if SELinux is enabled
     if command -v getenforce >/dev/null 2>&1 && [ "$(getenforce)" != "Disabled" ]; then
         echo "Setting SELinux context for config directory..."