History of project 6 changes

In crates/oh/src/main.rs, lines 1893–2059 on 12325e1b1020cc524c223e398bfa7b63f6596b104731de0dabf571a75ad7b0fc. 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 1893,2059:crates/oh/src/main.rs.