Hey man, read your breakdown on the Moongate architecture. Using Source Generators for DI and Lua for behavior decoupling so you never have to recompile C# is a beautiful setup. Strict domain separation is the way to go.
I saw your 'What's missing' list includes NPC AI.
I build AI agent workflows. Instead of building traditional, boring finite-state machines for NPCs, what if we plugged an LLM microservice into your Lua scripts? We could give key NPCs actual contextual memory and dynamic dialogue. Players could physically type to a merchant, negotiate prices, or ask for rumors, and the NPC would generate a response strictly within the lore of Ultima, triggering the correct Lua events (like handing over an item or opening a door).
Since you have the packet layer and Lua environment solid, the integration would be incredibly clean. I'd love to contribute and map out the AI logic for this if you're open to exploring it.