I agree with this idea of comments in close proximity to the actual issue. I am personaly trying to build a mechanisium for this but others may be better qualified. This is my approach;
Allow tiddlywiki to save in the browser session like noteself allows. Allow the fully updated wiki to be saved to disk but also allow comments, notes edits and new tiddlers to be exported to a json file or idealy emailed as an attachment from the browser, or submitted to file queue. Then provide an import tool which allows a review and apply changes during the import process.
Such a system would assist in rapid feedback and enhancement. Allowing lessons learned and observations made by people to be captured in real time.
Tony
Maybe I'm missing something. But where is the interaction?