History of gc 3 changes

In src/cli/workspace.rs, lines 199–222 on 21b2aec279ff41d19c1864f5c6a48f194c64d32ff6b83be6e21ed2e574420f5c. 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 199,222:src/cli/workspace.rs.