feat: change log table with retention cron and limits option

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

src/Limits.php

@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP;
+
+/**
+ * Admin-configurable limits (settings tab "Limits", spec §8.4).
+ */
+final class Limits
+{
+    public const OPTION = 'lit_mcp_limits';
+    public const DEFAULTS = ['upload_mb' => 5, 'log_retention_days' => 90, 'snapshot_count' => 20];
+    private const BOUNDS = ['upload_mb' => [1, 100], 'log_retention_days' => [1, 3650], 'snapshot_count' => [1, 100]];
+
+    public function uploadBytes(): int
+    {
+        return $this->uploadMegabytes() * 1024 * 1024;
+    }
+
+    public function uploadMegabytes(): int
+    {
+        return $this->all()['upload_mb'];
+    }
+
+    public function logRetentionDays(): int
+    {
+        return $this->all()['log_retention_days'];
+    }
+
+    public function snapshotCount(): int
+    {
+        return $this->all()['snapshot_count'];
+    }
+
+    /** @return array{upload_mb: int, log_retention_days: int, snapshot_count: int} */
+    public function all(): array
+    {
+        return self::sanitize(get_option(self::OPTION, []));
+    }
+
+    /**
+     * Settings API sanitize callback: always returns all keys, clamped to their bounds.
+     *
+     * @return array{upload_mb: int, log_retention_days: int, snapshot_count: int}
+     */
+    public static function sanitize(mixed $input): array
+    {
+        $input = is_array($input) ? $input : [];
+        $clean = self::DEFAULTS;
+        foreach (self::BOUNDS as $key => [$min, $max]) {
+            if (isset($input[$key]) && is_numeric($input[$key])) {
+                $clean[$key] = max($min, min($max, (int) $input[$key]));
+            }
+        }
+
+        return $clean;
+    }
+}