History of Swarm::step 1 change

In crates/backdrop/src/swarm.rs, lines 154–160 on 3b1bc27fe805521f486e8fc71d528404f354ed1c899c2fb2fef039ac7b0896cf. 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.