History of Credentials::scheme 1 change

In crates/oxy-strata/src/lib.rs, lines 240–246 on merge-remote-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 240,246:crates/oxy-strata/src/lib.rs.