If a copy of Yue dies, it will return to the battlefield. You'll be able to choose a new object to copy, but it will be a land named moon that can tap for colorless (it will still have any color and additional abilities). Since you're choosing a legendary permanent, and already control a legendary permanent named moon, you'll need to choose one to keep and put the other into the graveyard. As they're both lands, neither will trigger to return to the battlefield.

Note that the discard from Anvil is not prevented. If they're empty handed you can have them search, then discard the card they find. They'll be able to cast an instant before having to discard, but it would stop them from playing most things, including lands.

The copy would still be for Gavony Township, but do note you'll need to pay both times for a total of if you want to copy it twice. Rings will also trigger off of Kirol, but you'd need to pay to copy letting you pay again to copy Gavony for a total of if you wanted to copy it three times.

It will be a 1/1 spirit. Exiling it and returning it to the battlefield makes it a new object with no connection to the original, the same as if you cast a new Ascendant Spirit from your hand.