feat(compat): sweep of components against the real core with strict diagnostics

tests/compat/cache/router.php

@@ -0,0 +1,15 @@
+<?php
+
+// Router de compatibilidad del paquete cache (APCu via SAPI web).
+
+use Libs\APCache;
+use Libs\Router;
+
+Router::get('/compat/cache/apcache', function () {
+    $key = 'compat_' . bin2hex(random_bytes(4));
+    $ok  = APCache::save($key, 'valor-42', 30) !== false
+        && APCache::get($key) === 'valor-42';
+    APCache::delete($key);
+    $ok = $ok && APCache::get($key) === false;
+    echo $ok ? 'APC_OK' : 'APC_FAIL';
+});