The reason that there’s no consensus is because we’re dealing with over 3,000 educational institutions here AND because most colleges probably rescind admission on a case-by-case basis after considering a range of factors. They don’t want to give hard and fast rules because they want to have some leeway to make decisions. I think that the standards you set forth in the OP - no D or F grades, no unreported/significant changes, graduation, and no disciplinary issues - is probably as good as it’s going to get as far as general guidelines go. (Significant chances would be signing up for all AP or honors classes, reporting that to the college, and then changing the second semester schedule to like 6 credits of PE or dropping to all average-level classes - probably not changing AP French to AP government or deciding to take a creative writing class instead of computer applications).
The fact is, admissions rescission is pretty uncommon. The students who wander on here asking if their admission is going to get rescinded over letting an A drop to a B are either being purposely ridiculous OR they are suffering from being super-stressed out and paranoid about the whole process (given some of the odd stuff I’ve seen here, I have complete sympathy for them).