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/avg.md

@@ -0,0 +1,49 @@
+# `avg()`
+
+The avg method returns the average of all items in the collection:
+
+```js
+collect([1, 3, 3, 7]).avg();
+
+// 3.5
+```
+
+If the collection contains nested arrays or objects, you should pass a key to use for determining which values to calculate the average:
+
+```js
+const collection = collect([
+  {
+    name: 'My story',
+    pages: 176,
+  },
+  {
+    name: 'Fantastic Beasts and Where to Find Them',
+    pages: 1096,
+  },
+]);
+
+collection.avg('pages');
+
+// 636
+```
+
+You may also define a callback function
+
+```js
+const collection = collect([
+  {
+    name: 'My story',
+    pages: 176,
+  },
+  {
+    name: 'Fantastic Beasts and Where to Find Them',
+    pages: 1096,
+  },
+]);
+
+collection.avg(book => book.pages);
+
+// 636
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/avg.js)