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/sebastian/code-unit/src/CodeUnitCollection.php

@@ -0,0 +1,74 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/code-unit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\CodeUnit;
+
+use function array_merge;
+use function count;
+use Countable;
+use IteratorAggregate;
+
+/**
+ * @template-implements IteratorAggregate<int, CodeUnit>
+ *
+ * @psalm-immutable
+ */
+final class CodeUnitCollection implements Countable, IteratorAggregate
+{
+    /**
+     * @psalm-var list<CodeUnit>
+     */
+    private readonly array $codeUnits;
+
+    public static function fromList(CodeUnit ...$codeUnits): self
+    {
+        return new self($codeUnits);
+    }
+
+    /**
+     * @psalm-param list<CodeUnit> $codeUnits
+     */
+    private function __construct(array $codeUnits)
+    {
+        $this->codeUnits = $codeUnits;
+    }
+
+    /**
+     * @psalm-return list<CodeUnit>
+     */
+    public function asArray(): array
+    {
+        return $this->codeUnits;
+    }
+
+    public function getIterator(): CodeUnitCollectionIterator
+    {
+        return new CodeUnitCollectionIterator($this);
+    }
+
+    public function count(): int
+    {
+        return count($this->codeUnits);
+    }
+
+    public function isEmpty(): bool
+    {
+        return empty($this->codeUnits);
+    }
+
+    public function mergeWith(self $other): self
+    {
+        return new self(
+            array_merge(
+                $this->asArray(),
+                $other->asArray()
+            )
+        );
+    }
+}