History of proposal 6 changes

In crates/oh/src/main.rs, lines 905–1042 on close-proposal-140. 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 905,1042:crates/oh/src/main.rs.