History of Swarm::step 1 change

In crates/backdrop/src/swarm.rs, lines 154–160 on 234921ea0834d3a9a813a644f8bcbb6327eb110431606dd668bee168b3b5d3d4. 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 154,160:crates/backdrop/src/swarm.rs.