Does temporary resolution go on the chain/stack like a trigger?

Ruling: Yes, temporary resolution goes on the chain as a triggered ability and can be reacted to by both players.

Sequence:

• The trigger condition occurs at the controller's Beginning Phase
• The temporary trigger goes onto the chain
• Both players can react to it

Nuances:

• Units with temporary can be saved via effects like Zhonay's (this is not optional)