History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on f184f6d51a9fe44d6168a4a62ca865be722f38622540e8657f713d8b0ea9e093. 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.