History of project 6 changes

In crates/oh/src/main.rs, lines 1893–2059 on d9d0d314fdcbc309903206d93879124522323789dd8f8d2d28c7c92acb4bb52f. 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.