History of plan 2 changes

In crates/hub/src/diffusion.rs, lines 213–233 on 9aaa88b2d9c8f74f0f937c1862231bc25549b6fb879deced0de9565faa868c6a. 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 213,233:crates/hub/src/diffusion.rs.