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/php-parser/src/ast/nullkeyword.js

@@ -0,0 +1,20 @@
+/**
+ * Copyright (C) 2018 Glayzzle (BSD3 License)
+ * @authors https://github.com/glayzzle/php-parser/graphs/contributors
+ * @url http://glayzzle.com
+ */
+"use strict";
+
+const Node = require("./node");
+const KIND = "nullkeyword";
+
+/**
+ * Represents the null keyword
+ * @constructor NullKeyword
+ * @memberOf module:php-parser
+ * @extends {Node}
+ */
+module.exports = Node.extends(KIND, function NullKeyword(raw, docs, location) {
+  Node.apply(this, [KIND, docs, location]);
+  this.raw = raw;
+});