History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on ad2496f7e608641053085dd305d3a7e821d7aaebf4ca47f5a4b170837437af85. 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.