I've been wondering if it would be useful to have tools that help build better narratives for proposed changes. Which files should be viewed in which order? How do the changes tie together?

It's not quite literate programming - the commentary would have to be interwoven with the code, but it's not permanently attached to it.

Existing comment systems usually approach the interwoven change and commentary alright by interleaving comments into the diff, but they still don't allow you to choose which files or diff chunks are displayed in which order.