Species identification: 2.5mm (3/32" or 1.5/8") brownish ant in highrise apartment
According to the pest control expert, the ants are likely pharaoh ants.  It matches the description on the Wikipedia page in all respects:


Colour
Size
Pervasiveness in indoor environments throughout the world


He is treating the problem in my unit and a neighbour's unit using Maxforce Quantum.  It could take some time :( .

This is not conducive to a fitness regime of pushups, situps, leg lifts, and side planks (all on the ground, of course).  It doesn't help that my apartment largely has wall-to-wall carpeting coloured with a brown and white texture.  Spraying down the vicinity with vinegar is unlikely to help, as the ants have clearly demonstrated a lack of repulsion from vinegar droplets.