feat(wpmc S5): Plugin::boot wires TitleFilter + LinkFilter + RestUrlFilter

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

includes/class-plugin.php

@@ -55,6 +55,9 @@ final class Plugin
         TermMeta::register();
         Redirect::register();
         Router::register();
+        TitleFilter::register();
+        LinkFilter::register();
+        RestUrlFilter::register();
     }
 
     private function dependencies_satisfied(): bool

tests/PluginBootS5Test.php

@@ -0,0 +1,38 @@
+<?php
+declare(strict_types=1);
+
+namespace WPMultiCity\Tests;
+
+use WPMultiCity\Plugin;
+
+final class PluginBootS5Test extends TestCase
+{
+    public function test_boot_wires_s5_filter_registrations(): 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::assertSame(
+            9999,
+            has_filter('the_title', 'do_shortcode'),
+            'boot() must wire TitleFilter (the_title → do_shortcode @9999)'
+        );
+        self::assertSame(
+            9999,
+            has_filter('home_url', ['WPMultiCity\\LinkFilter', 'filter_home_url']),
+            'boot() must wire LinkFilter (home_url @9999)'
+        );
+        self::assertNotFalse(
+            has_filter('rest_url', ['WPMultiCity\\RestUrlFilter', 'preserve_host']),
+            'boot() must wire RestUrlFilter'
+        );
+    }
+}