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In a piece that starts with an anacrusis/pickup measure and ends, or ends a repeating section, with a compensating incomplete measure, is there a term for that final measure?
I don't think there is a specific term for it. Cute options would be calling it a katacrusis or a dropoff bar, with a somewhat moderate chance of people getting your meaning. They would also be sort-of candidates for an official term if such a one would often be asked for. But I don't think that happens often enough that some term would have had a chance to be solidly established.
P.S.: I see that Wikipedia in its entry for "anacrusis" refers to the completing bar as "complement" which seems as nice a term as any.
The simplest way to describe it would be to use its bar number. As for an actual name of this kind of incomplete bar; I don’t know of one.
Incidentally, a pickup bar at the beginning of a piece is bar 0.
