History of propose 7 changes

In crates/hub/src/diffusion.rs, lines 685–813 on a2ef53c5db269fa8bc86bb8abb13bb10ccba916129a301ca8738cb4829ff6680. 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 685,813:crates/hub/src/diffusion.rs.