History of bump 6 changes

In crates/hub/src/diffusion.rs, lines 684–773 on 657e7d5c9da9735f993d9c5f14afe1f35fd07065cf9b30a0ab089c46cc42b823. 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 684,773:crates/hub/src/diffusion.rs.