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>

node_modules/laravel-mix/src/components/PurifyCss.js

@@ -0,0 +1,18 @@
+const { Component } = require('./Component');
+
+module.exports = class PurifyCss extends Component {
+    passive = true;
+
+    /**
+     * Required dependencies for the component.
+     */
+    dependencies() {
+        if (this.context.config.purifyCss) {
+            throw new Error(
+                'PurifyCSS support is no longer available. We recommend using PurgeCss + postCss instead.'
+            );
+        }
+
+        return [];
+    }
+};