History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on cc7a00565161b0f3cdee591a879b4088d2018526dd7a8b9a846ab6699765e07a. 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.