History of gc 4 changes

In src/cli/workspace.rs, lines 978–1013 on be0161a88dd7dd5ff64acbf3866e312a3713c64122e79d33bc9bcfea4358f57a. 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.