test: assert plugin logs to injected PSR logger

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

tests/Support/RecordingLogger.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+
+namespace AeonDumpManager\Tests\Support;
+
+use Psr\Log\AbstractLogger;
+
+class RecordingLogger extends AbstractLogger
+{
+    /** @var list<array{level: string, message: string, context: array<mixed>}> */
+    public array $records = [];
+
+    public function log($level, string|\Stringable $message, array $context = []): void
+    {
+        $this->records[] = ['level' => (string) $level, 'message' => (string) $message, 'context' => $context];
+    }
+}