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Hold up. You take notes about private information you get from your neighbours over bbq? Do they know you're a spook? (I'm only half pulling your leg here; this is why I never tell anyone anything, because people cannot be trusted.)

a deep library of knowledge

This functional part I like (it's about the only functional part I can possibly like though, haha.) I made a datalake for this. It is like my personal knowledge base, indexed and with embeddings. I also should disclose that I rarely use it, but that's because I'm too busy to adapt it wider.

What it does not contain: private conversations, financials, sensitive stuff like PII, contacts and so on. Everything (=knowledge) could in theory be ingested, but I have thus far only fed it research and notes on that research, and all security review work I do regarding 3rd party apps on my phones (because that's more useful than grepping markdown.)

All private, selfhosted, on-prem everything.

This technical part I like. It's the only way.