History of Swarm::fetch 2 changes

In crates/flow/src/swarm.rs, lines 151–324 on d65cad6bdeb502f045d82a94a4c41688bed3136a22f2d5b315b6a07005f2e81d. 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 151,324:crates/flow/src/swarm.rs.