History of router 6 changes

In crates/hub/src/lib.rs, lines 166–174 on 3ff52534f69b33516f451f62e6e48260d233489b84aa92d9309400979016c155. 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 166,174:crates/hub/src/lib.rs.