building good systems with memory is an open problem that im still trying to figure out too.

i think claude code might be a good start, though if you want to build a custom memory system, you might want to move off it eventually. that might take a while to build, though.

i would suggest trying claude code, and having the memory archive somewhere where sonnet 4.5 in claude code can read them, and also work together with opus in claude code to iterate on the infrastructure and understand what claude code can and cannot easily support.