tags is better than categories, imo. The tracker originally used categories from the existing frontmatter field, and it led to inconsistencies. I’ve just updated the tracker with a cleaner categorization schema based on keywords only, but can adapt it to whatever system we come up with.

Hybrid. A recommended vocabulary of tags that authors are encouraged to draw from, plus the ability to add new tags when none fit.

If we’re defining a new categories/tags field in #520, we should standardize it on YAML inline lists from the start, and potentially use this as the opportunity to also resolve #177 and #824 by migrating authors and relatedFeps to the same format.