History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on 3faccd90ddfa33e971a9de87f3f7e9b4b7c4d98bb459bef955f5842219dcd920. 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.