History of Swarm::step 1 change

In crates/backdrop/src/swarm.rs, lines 154–160 on b9b74d997cecc19ad363184695f1a78118182c4d774906efbee092d671bfc54f. 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.