History of release 3 changes

In crates/oh/src/main.rs, lines 2012–2103 on 3b65065298b7cb1b82505b4fc6e4240d6d9a099549b32aa96af3db086729d53e. 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 2012,2103:crates/oh/src/main.rs.