The Silmarillion proper ends with the fall of Angband. You could say, of course, that this was also "asked for" by Earendil and granted by the Valar. But I don't see how that makes it non-eucatastrophic. A eucatastrophe doesn't need to be completely unexpected and unsought. In LotR, Gandalf, Aragorn, and many others are aware of Frodo's quest. And the fall of Morgoth is unexpected.
I would say that the requirement for a eucatastrophe is that there is a happy ending following a moment of utter hopelessness.
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