History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on 28fee1c9eb6c77cc9fe9c4204677c2293863326d60954902281dbbd2ea3f8216. 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.