History of checkpoint 1 change

In crates/hub/src/tlog.rs, lines 622–627 on oh-comment-body-file. 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 622,627:crates/hub/src/tlog.rs.