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>

node_modules/collect.js/docs/api/diffUsing.md

@@ -0,0 +1,25 @@
+# `diffUsing()`
+
+The diffUsing method compares the collection against another collection or a plain array based on its values using a callback. This method will return the values in the original collection that are not present in the given collection:
+
+```js
+const collection = collect([
+  { name: 'Alice', age: 25 },
+  { name: 'Bob', age: 30 },
+  { name: 'Charlie', age: 35 },
+]);
+
+const users = [
+  { name: 'Bob', age: 30 },
+  { name: 'Charlie', age: 35 },
+  { name: 'David', age: 40 },
+];
+
+const diff = collection.diffUsing(users, (a, b) => a.age - b.age);
+
+diff.all();
+
+// [{ name: 'Alice', age: 25 }]
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/diffUsing.js)