History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on be451356e3ef50e074343ccafba1c1174e261c2bfe9c5ff13d6a26ba884ee4d4. 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.