Add discussion item on validation rules similarity (#673)

Author: michaelstaib

agendas/2025/10-Oct/30-week-5.md

@@ -122,3 +122,4 @@ cadence of progress we also have weekly meetings which tend to be more informal.
 1. Check for [ready for review agenda items](https://github.com/graphql/composite-schemas-wg/issues?q=is%3Aissue+is%3Aopen+label%3A%22Ready+for+review+%F0%9F%99%8C%22+sort%3Aupdated-desc) (5m, Host)
 1. Reminder: [grants available for key initiatives](https://graphql.org/community/foundation/community-grant/) (1m, Host)
 1. `ARG` vs `ARGUMENT` (5m, Pascal)
+1. How do we want to approach the validation rules similarity  (15m, Pascal)