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/collect.js/docs/api/sole.md

@@ -0,0 +1,42 @@
+# `sole()`
+
+The sole method returns the first element in the collection that passes a given truth test, but only if the truth test matches exactly one element:
+
+```js
+collect([1, 2, 3, 4]).sole(item => item === 1);
+
+// 1
+```
+
+If there are no elements in the collection that should be returned by the sole method, then an error will be thrown:
+
+```js
+collect([1, 2, 3, 4]).sole(item => item > 4);
+
+// Error ('Item not found.') is thrown.
+```
+
+If there are multiple elements in the collection that should be returned by the sole method, then an error will be thrown:
+
+```js
+collect([1, 2, 3, 4]).sole();
+
+// Error ('Multiple items found.') is thrown.
+```
+
+Like the firstOrFail method, you may also pass an attribute, operator, and value:
+
+```js
+const collection = collect([
+  { product: 'Desk', price: 200, discounted: true },
+  { product: 'Chair', price: 100, discounted: true },
+  { product: 'Bookcase', price: 150, discounted: true },
+  { product: 'Door', price: 100 },
+]);
+
+collection.sole('product', '=', 'Desk');
+
+// { product: 'Desk', price: 200, discounted: true }
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/sole.js)