History of gc 3 changes

In src/cli/workspace.rs, lines 254–277 on 8e1194860efaf059e0fa9081944a9b36ada868976604745858f0debc3b3e0049. 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 254,277:src/cli/workspace.rs.