History of project 4 changes

In crates/oh/src/main.rs, lines 1702–1836 on 456f4197ade3c7be8561d727ed3ce28b309815ebe4a94765062ee3a9fb7575b2. 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 1702,1836:crates/oh/src/main.rs.