What you're describing sounds an awful lot like a barebones obsidian vault.(https://obsdian.md https://obsdian.md) I'm not familiar with the OP's notion of a "

What you're describing sounds an awful lot like a barebones obsidian vault.(https://obsdian.md https://obsdian.md) I'm not familiar with the OP's notion of a "zettlegarden" but I get the impression that they want something a bit more than just markdown files. Perhaps the idea is to increase the notion of connection between captured notes, whether intentional created, or "serendipitous".