feat: admin check steps with throwaway write test and reports

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Integrations/Divi/Release/CheckReportStore.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Release;
+
+defined('ABSPATH') || exit;
+
+/** The latest admin check report of this site (spec §6.3). Not final so the Divi tab can be tested with a mock. */
+class CheckReportStore
+{
+    public const OPTION = 'lit_mcp_divi_check_report';
+
+    public function latest(): ?CheckReport
+    {
+        return CheckReport::fromArray(get_option(self::OPTION, null));
+    }
+
+    public function save(CheckReport $report): void
+    {
+        update_option(self::OPTION, $report->toArray(), false);
+    }
+}