That's a Honey Bee, looks like of Italian strain.

Konrad

Thanks. Is there any way to know whether it's wild or from some local beekeeper's hive? I see very few of these bees, on a big planting of lemon balm, catnip, and bergamot (There are bumblebees, especially on the bergamot, not so much in the intermixed lemon balm/catnip).

It's hard to follow bees back their nest..you could mark them with paint and see how long
it will take for a round trip to give you some sort of idea.
This bee could come from a escaped swarm not far from you, taken up residence in a older home between walls.
Think I have been reading about someone captured and glued a light feather to the abdomen which slows the bee
down, so you can follow it back to their home,.. hopefully not going over a major highway or buildings.

Konrad