History of project 6 changes

In crates/oh/src/main.rs, lines 1904–2070 on diffusion-pin-bookmark. 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 1904,2070:crates/oh/src/main.rs.