History of gc 6 changes

In src/cli/workspace.rs, lines 1598–1633 on d6e0d5b8b339aaae38f3ceb1c1044e5f7f0c71c6f87db2a94b67410783e81403. 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 1598,1633:src/cli/workspace.rs.