History of plan 2 changes

In crates/hub/src/diffusion.rs, lines 460–480 on f6529a2fb9db17410960eca0baa6f0c4fc345a5e3b9ae58ada24f14d470f27ed. 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.