TL;DR of the post, generated automatically.

Unity 6.7 ships Cloud Code 3.0 as an official package, with stateful modules.

• Stateful modules: add [StateScope] to a module class; public fields keep values between calls.
• Scope: Scope.Player gives each player their own state, per the post.
• Local testing: run module code on your machine with multiple local players, no deploy needed.