“What the merry fuck,” you may well ask, “is this?” Just testing, is all.
And failing on the index page, which is a bit tiresome.
Okay, seem to have got it working, albeit in a thoroughly unsatisfactory way. It appears that only global scripts and styles get added to the head on index posts, at least with the Scripts N Styles plugin. Which is clearly wrong — why would you ever want the things you put in a post to break in the index? — but there you go. Perhaps a better way will become apparent on further investigation…