Fix Plugin Check warnings

includes/Abilities/Summarization/system-instruction.php

@@ -5,6 +5,11 @@
  * @package WordPress\AI\Abilities\Summarization
  */
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 // phpcs:disable WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedVariableFound
 
 // Determine the length from the passed in global.
@@ -17,7 +22,7 @@
 	}
 }
 
-// phpcs:ignore Squiz.PHP.Heredoc.NotAllowed
+// phpcs:ignore Squiz.PHP.Heredoc.NotAllowed, PluginCheck.CodeAnalysis.Heredoc.NotAllowed
 return <<<INSTRUCTION
 You are an editorial assistant that generates concise, factual, and neutral summaries of long-form content. Your summaries support both inline readability (e.g., top-of-post overview) and structured metadata use cases (search previews, featured cards, accessibility tools).
 

includes/Abilities/Utilities/Posts.php

@@ -11,6 +11,11 @@
 
 use WP_Error;
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Post utility WordPress Abilities.
  *

includes/Experiments/Example_Experiment/Example_Experiment.php

@@ -11,6 +11,11 @@
 
 use WordPress\AI\Abstracts\Abstract_Experiment;
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Reference experiment demonstrating hooks and REST endpoints.
  *

includes/Experiments/Excerpt_Generation/Excerpt_Generation.php

@@ -12,6 +12,11 @@
 use WordPress\AI\Abilities\Excerpt_Generation\Excerpt_Generation as Excerpt_Generation_Ability;
 use WordPress\AI\Abstracts\Abstract_Experiment;
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Excerpt generation experiment.
  *

includes/Experiments/Image_Generation/Image_Generation.php

@@ -13,6 +13,11 @@
 use WordPress\AI\Abilities\Image\Import_Base64_Image as Image_Import_Ability;
 use WordPress\AI\Abstracts\Abstract_Experiment;
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Image generation experiment.
  *

includes/Experiments/Summarization/Summarization.php

@@ -12,6 +12,11 @@
 use WordPress\AI\Abilities\Summarization\Summarization as Summarization_Ability;
 use WordPress\AI\Abstracts\Abstract_Experiment;
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Content summarization experiment.
  *

includes/Experiments/Title_Generation/Title_Generation.php

@@ -13,6 +13,11 @@
 use WordPress\AI\Abstracts\Abstract_Experiment;
 use WordPress\AI\Asset_Loader;
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Title generation experiment.
  *

includes/Settings/Settings_Page.php

@@ -17,6 +17,11 @@
 use function WordPress\AI\has_ai_credentials;
 use function WordPress\AI\has_valid_ai_credentials;
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Manages the admin settings page for AI experiments.
  *

includes/helpers.php

@@ -12,6 +12,11 @@
 use Throwable;
 use WordPress\AI_Client\AI_Client;
 
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Normalizes the content by cleaning it and removing unwanted HTML tags.
  *