dmtry

It's become much easier to do this with the advent of tiled vector data and libraries like https://github.com/maplibre/geojson-vt

Here is an example using Mapbox GL - https://demos.mapbox.com/boundaries-explorer/?country=US&lay...

I like git-notes (https://git-scm.com/docs/git-notes) for this sort of annotations and context. It's a nice balance - adjacent to commits, follows branch structure, easy to instrument, doesn't muddy the commit history.

Being able to stick a bit of directive text somewhere durable at any point in time has been surprisingly convenient for steering LLMs, as well.