>>GavCo+(OP)
It's kind of in between. There's no manifesto other than the site guidelines (
https://news.ycombinator.com/newsguidelines.html), which leave out a ton of information—we keep them brief in the hope that people will actually read them. But there's a trove of knowledge about all of this embedded in past moderation comments, which is why I constantly post HN Search links. I realize it's not a convenient format at all, but you can learn a lot if you start with those links and then tweak the searches either by adding terms or excluding them (as in "-foo"). If you (or anyone) do that and still have questions which I haven't answered in the past, I'd be interested in hearing the questions.
It's my intention to distill a bunch of those explanations into a set of loose commentaries on how HN and HN moderation work. But it's the sort of thing that never rises above the middle of the todo list. Maybe one day.