History of project 3 changes

In crates/oh/src/main.rs, lines 1688–1802 on 794ff94f194a4de38bbbd80498747a270cf8ced1f95e4decc09be5cff5fca18a. 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 1688,1802:crates/oh/src/main.rs.