AI: Prevent wp_supports_ai filter from overriding the WP_AI_SUPPORT constant.

When `WP_AI_SUPPORT` is explicitly set to `false`, `wp_supports_ai()` now returns early before the filter runs. This ensures the site owner's explicit preference to disable AI cannot be overridden by a plugin via the `wp_supports_ai` filter.

The filter default is now always `true`, since the constant check happens beforehand.

Developed in: #11295

Follow-up to [62067].

Reviewed by justlevine, westonruter, adamsilverstein.
Merges [62239] to the 7.0 branch.

Props justlevine, westonruter, gziolo, mindctrl, adamsilverstein, johnjamesjacoby, ahortin, nilambar, ozgursar, audrasjb, jeffpaul.
Fixes #64706.




git-svn-id: https://develop.svn.wordpress.org/branches/7.0@62241 602fd350-edb4-49c9-b593-d223f7449a82

Author: gziolo

src/wp-includes/ai-client.php

@@ -17,20 +17,22 @@
  * @return bool Whether AI features are supported.
  */
 function wp_supports_ai(): bool {
-	$is_enabled = defined( 'WP_AI_SUPPORT' ) ? WP_AI_SUPPORT : true;
+	// Return early if AI is disabled by the current environment.
+	if ( defined( 'WP_AI_SUPPORT' ) && ! WP_AI_SUPPORT ) {
+		return false;
+	}
 
 	/**
-	 * Filters whether the current request should use AI.
+	 * Filters whether the current request can use AI.
 	 *
 	 * This allows plugins and 3rd-party code to disable AI features on a per-request basis, or to even override explicit
 	 * preferences defined by the site owner.
 	 *
 	 * @since 7.0.0
 	 *
-	 * @param bool $is_enabled Whether the current request should use AI. Default to WP_AI_SUPPORT constant, or true if
-	 *                         the constant is not defined.
+	 * @param bool $is_enabled Whether AI is available. Default to true.
 	 */
-	return (bool) apply_filters( 'wp_supports_ai', $is_enabled );
+	return (bool) apply_filters( 'wp_supports_ai', true );
 }
 
 /**