History of gc 3 changes

In src/cli/workspace.rs, lines 254–277 on 8f10a07a1dbe4c01e71db2a654e0371a60635577b0a8a0d5a69759e5dcf2d18a. 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.