The canonical location for the checklist to deploy a new extension is at https://www.mediawiki.org/wiki/Review_queue#Checklist
while I would have spontaneously linked to https://www.mediawiki.org/wiki/Writing_an_extension_for_deployment instead.
Would others also appreciate if we had one single place? :)
Might even be an good first bug task once we've defined which place to prefer.