History of route 2 changes

In crates/flow/src/swarm.rs, lines 623–654 on v0.4.0. 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 623,654:crates/flow/src/swarm.rs.