History of Swarm::step 1 change

In crates/backdrop/src/swarm.rs, lines 154–160 on ba0a55bb5b3cbbf862258bc5c9de6d41e5073b1fd1f730a7bbe7f87a25fcb327. 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.