fix(wpmc 1.1.0): review polish — continue on bad permalink, ACF guard, drop suppress_filters, process-isolated AJAX test

- Redirect::handle: continue instead of return when get_permalink fails on a row (allow trying next row)
- Helpers::acf_ready() now public so Redirect can guard get_field('page_unic', ...) consistently
- Drop suppress_filters=false from get_posts (was risky on sites with query-altering plugins)
- @runInSeparateProcess for DOING_AJAX test (replaces Z-prefix ordering hack)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

includes/class-redirect.php

@@ -30,12 +30,11 @@ final class Redirect
         }
 
         $candidates = \get_posts([
-            'name'             => $slug,
-            'post_type'        => 'page',
-            'post_status'      => ['private', 'publish'],
-            'posts_per_page'   => 1,
-            'no_found_rows'    => true,
-            'suppress_filters' => false,
+            'name'           => $slug,
+            'post_type'      => 'page',
+            'post_status'    => ['private', 'publish'],
+            'posts_per_page' => 1,
+            'no_found_rows'  => true,
         ]);
         if (empty($candidates)) {
             return;
@@ -43,7 +42,7 @@ final class Redirect
 
         $candidate_id = (int) $candidates[0]->ID;
 
-        if (!\function_exists('get_field')) {
+        if (!Helpers::acf_ready() || !\function_exists('get_field')) {
             return;
         }
         $rows = \get_field('page_unic', 'option');
@@ -71,7 +70,7 @@ final class Redirect
                 static fn () => \get_permalink($orig_id)
             );
             if (!is_string($orig_permalink) || $orig_permalink === '') {
-                return;
+                continue;
             }
             $path_only = Helpers::remove_domain_link($orig_permalink);
             $redirect_to = '/' . $term->slug . $path_only;