History of gc 3 changes

In src/cli/workspace.rs, lines 254–277 on b7f102fcbb1757bfafa4a431d6ef79ef1eb451708c1da946278617e22075e3ea. 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.