add default-popup-maker mu-plugin

[julesfell]

This pull request fixes issue #{id}.

It will apply the following changes :

---

Note

Low Risk
Low risk: adds a small MU plugin that only filters Popup Maker admin alerts and does not change data, auth, or front-end behavior.

Overview
Adds a new MU plugin (default-popup-maker.php) that filters Popup Maker’s pum_alert_list to remove the pum_writeable_notice (filesystem cache not writeable) alert, preventing that admin notice from being displayed.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: Missing ABSPATH guard present in all other plugins
  • Added the missing ABSPATH guard after the namespace declaration to maintain consistency with all other mu-plugin files in the repository.

Or push these changes by commenting:

@cursor push cc27b09ce2

Preview (cc27b09ce2)

diff --git a/default-popup-maker.php b/default-popup-maker.php
--- a/default-popup-maker.php
+++ b/default-popup-maker.php
@@ -9,6 +9,10 @@
 
 namespace BEAPI\Plugin_Defaults\Popup_Maker;
 
+if ( ! defined( 'ABSPATH' ) ) {
+	die( 'Cannot access pages directly.' );
+}
+
 add_filter( 'pum_alert_list', __NAMESPACE__ . '\\strip_filesystem_cache_alert', 999 );
 
 /**

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