History of gc 3 changes

In src/cli/workspace.rs, lines 421–444 on c792033af3441e2bd3388ea1dc814fcd218c4df654a2738e2bb172b7a77ea54a. 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 421,444:src/cli/workspace.rs.