History of gc 4 changes

In src/cli/workspace.rs, lines 981–1016 on e0d56dfca51d391b5cdf8acd3bc3ce489c307dfac17b865a48462d93380114e6. 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 981,1016:src/cli/workspace.rs.