History of Swarm::busy 2 changes

In crates/backdrop/src/swarm.rs, lines 170–172 on draft-ready. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 170,172:crates/backdrop/src/swarm.rs.