History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on e4cd0c540dab470bf56fcf821dd9464d1e2b12c0e1c89533dd0714ac5fc99b22. 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 978,1013:src/cli/workspace.rs.