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

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

vendor/sebastian/code-unit/README.md

@@ -0,0 +1,22 @@
+[![Latest Stable Version](https://poser.pugx.org/sebastian/code-unit/v/stable.png)](https://packagist.org/packages/sebastian/code-unit)
+[![CI Status](https://github.com/sebastianbergmann/code-unit/workflows/CI/badge.svg)](https://github.com/sebastianbergmann/code-unit/actions)
+[![Type Coverage](https://shepherd.dev/github/sebastianbergmann/code-unit/coverage.svg)](https://shepherd.dev/github/sebastianbergmann/code-unit)
+[![codecov](https://codecov.io/gh/sebastianbergmann/code-unit/branch/main/graph/badge.svg)](https://codecov.io/gh/sebastianbergmann/code-unit)
+
+# sebastian/code-unit
+
+Collection of value objects that represent the PHP code units.
+
+## Installation
+
+You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):
+
+```
+composer require sebastian/code-unit
+```
+
+If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:
+
+```
+composer require --dev sebastian/code-unit
+```