feat(wpmc S3): Plugin::boot() wires ShortcodeDmr

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

includes/class-plugin.php

@@ -50,6 +50,7 @@ final class Plugin
         Taxonomy::register();
         PostType::register();
         FieldGroup::register();
+        ShortcodeDmr::register();
     }
 
     private function dependencies_satisfied(): bool

tests/PluginBootShortcodeDmrTest.php

@@ -0,0 +1,28 @@
+<?php
+declare(strict_types=1);
+
+namespace WPMultiCity\Tests;
+
+use WPMultiCity\Plugin;
+
+final class PluginBootShortcodeDmrTest extends TestCase
+{
+    public function test_boot_attaches_shortcode_dmr_init_action(): void
+    {
+        if (!class_exists('ACF', false)) {
+            eval('class ACF {}');
+        }
+
+        $plugin = Plugin::instance();
+        $reflection = new \ReflectionClass($plugin);
+        $prop = $reflection->getProperty('booted');
+        $prop->setValue($plugin, false);
+
+        $plugin->boot();
+
+        self::assertNotFalse(
+            has_action('init', ['WPMultiCity\\ShortcodeDmr', 'do_register']),
+            'boot() must register ShortcodeDmr on init'
+        );
+    }
+}