History of plan 2 changes

In crates/hub/src/diffusion.rs, lines 460–480 on 32d97df55ab7badadf9ae0c373eafd0009703eeee63a1d8622ce8f2acaa27dcc. 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 460,480:crates/hub/src/diffusion.rs.