refactor(tests): remove redundant tests and fix assertion style

Remove subset/duplicate architecture tests already covered by broader
checks, and replace assertTrue(true) with self::addToAssertionCount(1)
for explicit no-exception-thrown intent.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/Service/Access/AuthorizationPolicyContextTrait.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace MintyPHP\Service\Access;
+
+trait AuthorizationPolicyContextTrait
+{
+    protected function actorUserId(array $context): int
+    {
+        return (int) ($context['actor_user_id'] ?? 0);
+    }
+
+    protected function hasPermission(int $userId, string $permissionKey): bool
+    {
+        return $userId > 0 && $this->permissionService->userHas($userId, $permissionKey);
+    }
+
+    protected function capabilitiesFromDecision(AuthorizationDecision $decision): array
+    {
+        $capabilities = $decision->attribute('capabilities', []);
+        return is_array($capabilities) ? $capabilities : [];
+    }
+}