A backend engineer boarded a late train with a half-finished agent run still sitting in a terminal. The laptop held repository tokens inside a local vault, and the next tool call needed a long compile that would wake every fan. Cellular data flickered between two bars and airplane mode, so a naive always-remote setup would stall without warning. An always-local setup would cook the chassis and drain the battery before the next station arrived. That commute is the whole placement problem in mi...