That’s it. No home assistant or equivalent. Automation and other rules are in node-red. Manual control is through Siri via the virtual HomeKit devices.
As for devices, it’s mostly just the lights, thermostats, and a weather station, though I also control a fan and the TV* via a harmony hub and am thinking about getting a smart plug for my dehumidifier.
*getting the fake HomeKit TV to work right in node-red was more trouble than everything else put together :(
It’s been a few years so I don’t remember exactly, but basically I used to use ControllerMate (like autohotkey but not awful) and when it died I went in search of other nodal programming tools. Never found a good replacement for CM, but node-red is amazing in its own way.
When HA wa much younger I played with node red as an alternative to its built in automation language, but the HA automations quickly got "good enough" that I didnt go with it.