feat: M3 import & indexing engine delivery layer with durable collision handling, space checking and console

src/Indexer/ScanError.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MeshVault\Indexer;
+
+final readonly class ScanError
+{
+    public const SCAN_READ_ERROR = 'SCAN_READ_ERROR';
+
+    public function __construct(
+        public string $sourcePath,
+        public string $code,
+        public string $message,
+    ) {
+    }
+}