History of project 3 changes

In crates/oh/src/main.rs, lines 1222–1336 on run-one-job. 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 1222,1336:crates/oh/src/main.rs.