Address code review feedback: refactor field casting and improve test reliability

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

features/site.feature

@@ -817,7 +817,14 @@ Feature: Manage sites in a multisite installation
     Then STDOUT should be a number
     And save STDOUT as {SITE_ID}
 
-    When I run `wp site delete $(wp site get http://example.com/deleteme/ --field=blog_id) --yes`
+    When I run `wp site get http://example.com/deleteme/ --field=blog_id`
+    Then STDOUT should be:
+      """
+      {SITE_ID}
+      """
+    And save STDOUT as {BLOG_ID}
+
+    When I run `wp site delete {BLOG_ID} --yes`
     Then STDOUT should contain:
       """
       Success: The site at

src/Site_Command.php

@@ -500,11 +500,11 @@ public function get( $args, $assoc_args ) {
 		$site_data['url'] = trailingslashit( get_home_url( $site->blog_id ) );
 
 		// Cast numeric fields to int for consistent output
-		if ( isset( $site_data['blog_id'] ) && is_scalar( $site_data['blog_id'] ) ) {
-			$site_data['blog_id'] = (int) $site_data['blog_id'];
-		}
-		if ( isset( $site_data['site_id'] ) && is_scalar( $site_data['site_id'] ) ) {
-			$site_data['site_id'] = (int) $site_data['site_id'];
+		$numeric_fields = [ 'blog_id', 'site_id', 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id' ];
+		foreach ( $numeric_fields as $field ) {
+			if ( isset( $site_data[ $field ] ) && is_scalar( $site_data[ $field ] ) ) {
+				$site_data[ $field ] = (int) $site_data[ $field ];
+			}
 		}
 
 		// Set default fields if not specified