History of Swarm::join 2 changes

In crates/flow/src/swarm.rs, lines 345–375 on main. 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 345,375:crates/flow/src/swarm.rs.