Fix bin/publish: copy docs.dist from project root

Fix bin/publish: use correct .env path for rspade_system
Fix bin/publish script: prevent grep exit code 1 from terminating script

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

vendor/league/flysystem/src/UnableToCheckExistence.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace League\Flysystem;
+
+use RuntimeException;
+use Throwable;
+
+class UnableToCheckExistence extends RuntimeException implements FilesystemOperationFailed
+{
+    final public function __construct(string $message = "", int $code = 0, ?Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+    }
+
+    public static function forLocation(string $path, ?Throwable $exception = null): static
+    {
+        return new static("Unable to check existence for: {$path}", 0, $exception);
+    }
+
+    public function operation(): string
+    {
+        return FilesystemOperationFailed::OPERATION_EXISTENCE_CHECK;
+    }
+}