Been using Castro since its first version like, a decade ago? It's been consistently in my top-few apps on my phone forever - and this focus on Siri support is terrific! I really like the details you all did around the user-guide to help configure things.
For an app that is mostly in your pocket, it's super handy to be able to manipulate it from a Siri command, instead of having to get out your phone and tap buttons!