History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on 9a239f064f765648bdc66bb1e30f31398b3e82fc45db4119f2b2d9f057ef626d. 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.