History of project 6 changes

In crates/oh/src/main.rs, lines 1728–1894 on de4467cb1eca37be7cee3be4e9179d085c21deb52184dce3d4784119a61b85b2. 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.