After it all is done, what is left to do, but find more? Why don't we rest, relax, and enjoy our few passing years?

Yes; more depression and anxiety about an uncertain future.

The SWE people I know at SW companies now heavily using these agents complain to me how their workday is nothing but code-reviews of the agents output and tedious prompting to prod it back into line; they say they don’t get to actually write code until they get home to work on their personal projects.

3 years ago I never would have believed this capability was possible; I’ve since adjusted my expectations to now assume that in another 3 years the models/agents will have improved enough to reduce the amount of code-review required, leaving us with precious little else to do for our shareholders, or the opposite: they don’t improve and we’re stuck doing thankless PR reviews until the end.

Please tell me where and how in this future I’m supposed to find satisfaction and pride in my work when what-gets-produced isn’t my own work anymore?

Up until you feel automated.