checkpoint: pre-audit baseline state

includes/class-conversation-manager.php

@@ -539,7 +539,7 @@ class WP_Agentic_Writer_Conversation_Manager {
 
 		$sessions = $wpdb->get_results(
 			$wpdb->prepare(
-				"SELECT * FROM {$this->table_name} WHERE post_id = %d ORDER BY updated_at DESC",
+				"SELECT *, JSON_LENGTH(messages) as message_count FROM {$this->table_name} WHERE post_id = %d ORDER BY updated_at DESC",
 				$post_id
 			),
 			ARRAY_A