hackeragain.com
This one is, of course, on the list.
Though jokes aside, Kinda impressive that almost all of us are converging on the same idea. Great minds thinks alike haha!
PS: hnrecommends.com is a website listed in your aggregator but it seems that there is an heroku error on that website which fails to show it there.
Another idea though, I don't know if I am grasping at straws here but perhaps an MCP server can be created where I can just link that and then say search "I want to find a good non fiction book" and then it can look at the aggregator of aggregator, go to the HN book aggregator and then it can then take into the data at HNbook into reference to give the final suggestion and the AI can then tell me how verified/vouched it was by HN. The same can happen for dev tools, github projects, movies, tv, youtube videos etc.
Maybe we can all then build an interface on top of that MCP itself but still, I am just in love with what the community is building and these projects are lovely because they show that love outwards and helps in showing how good HN sometimes is :-D