History of project 6 changes

In crates/oh/src/main.rs, lines 1728–1894 on f4e13830119830eb12f7474f7478128e782f16a65bc3a625495c9f5ef2eaac36. 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 1728,1894:crates/oh/src/main.rs.