History of project 6 changes

In crates/oh/src/main.rs, lines 1728–1894 on 5714347a62336e67d4918ac400276b2972ac95c172f4e0bd9bf54c93b978c728. 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 1728,1894:crates/oh/src/main.rs.