fix(bricks): enable publicTemplates setting so /template/* URLs resolve

Bricks's frontend.php template_redirect() permanently redirects any
/template/* URL to the homepage (site_url(), 301) when :
  - is_singular(bricks_template)
  - !current_user_can_use_builder()
  - !isset(bricks_global_settings.publicTemplates)
  - !maintenance mode

This kicks in BEFORE the Bricks builder check can run, so clicking
"Edit with Bricks" on a template ends up redirected to home → admin
URL → Bricks's own builder.php sees current_post_type as empty (because
the post wasn't actually queried before the redirect) → final redirect
to wp-admin/edit.php?post_type=&bricks_notice=error_post_type with the
"Invalid post type" notice.

Setting bricks_global_settings.publicTemplates = '1' disables this
preemptive redirect. Templates stay excluded from search but their
permalinks resolve normally → builder can attach.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/av-enable-public-templates.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * Plugin Name: Asterion — Enable Bricks publicTemplates setting
+ * /?av_enable_public_templates=1
+ *
+ * Bricks redirects /template/* URLs to the homepage when the user can't use
+ * the builder AND publicTemplates is unset. This causes "Edit with Bricks"
+ * to fail with "Invalid post type" because the builder URL (?bricks=run on
+ * the template permalink) gets redirected before reaching the builder.
+ *
+ * The fix : set publicTemplates=1 in Bricks global settings. Templates are
+ * still excluded from search results, but their permalinks resolve normally
+ * → the builder can load them.
+ */
+defined('ABSPATH') || exit;
+
+add_action('template_redirect', function () {
+    if (! in_array($_SERVER['SERVER_NAME'] ?? '', ['localhost', '127.0.0.1'], true)) return;
+    if (empty($_GET['av_enable_public_templates'])) return;
+
+    header('Content-Type: text/plain; charset=utf-8');
+
+    $opts = get_option('bricks_global_settings', []);
+    if (! is_array($opts)) $opts = [];
+
+    $before = $opts['publicTemplates'] ?? '(unset)';
+    $opts['publicTemplates'] = '1';
+    update_option('bricks_global_settings', $opts);
+
+    echo "bricks_global_settings.publicTemplates : " . var_export($before, true) . " → '1'\n";
+    echo "\nTemplate URLs (/template/...) should now resolve directly without redirecting to home.\n";
+    echo "Edit with Bricks on Header / Footer / Single Post should work.\n";
+    exit;
+});