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/is-plain-obj/index.d.ts

@@ -0,0 +1,29 @@
+/**
+Check if a value is a plain object.
+
+An object is plain if it's created by either `{}`, `new Object()`, or `Object.create(null)`.
+
+@example
+```
+import isPlainObject = require('is-plain-obj');
+
+isPlainObject({foo: 'bar'});
+//=> true
+
+isPlainObject(new Object());
+//=> true
+
+isPlainObject(Object.create(null));
+//=> true
+
+isPlainObject([1, 2, 3]);
+//=> false
+
+class Unicorn {}
+isPlainObject(new Unicorn());
+//=> false
+```
+*/
+declare function isPlainObject<Value = unknown>(value: unknown): value is Record<string | number | symbol, Value>;
+
+export = isPlainObject;