So I think I’ve now got interactions set up and displaying properly!
I’m relying on webmention.app to actually send my responses out, and while that seems to work well with Bridgy and to webmention.io endpoints, in my limited experience so far it seems kind of flaky when the destination is a Wordpress blog using a plugin to have a self-hosted endpoint. Unless it’s just confused by likes with no original content… IDK. More experimentation needed, maybe. Anyway, regardless, my implementation is basically working 😊