If can still edit, may want to add "Show HN:" at title's start.
>prompt memory tool
We used to call this a snippet manager. For Firefox will recommend Clippings. Simple design, folders/search. But if you're on Linux (or even Windows), just make snippets/ directory and drop 'em in there, then fd/rg to find what you're looking for. (Or use a comprehensive tool like @mattn/memo.)
But your tool nice too. Is like more organization-oriented (+folders, +categories) Keep (only has tags). Though imo only really need folders and tags. Folders for hierarchical structure, tags for flexible labeling. Categories (taxonomy) is redundant.