History of scheduler 2 changes

In crates/hub/src/flow.rs, lines 1666–1680 on 3776b70d9b1732b154af056951f3709461d06c90ab9bc0a868da243d9386b890. 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 1666,1680:crates/hub/src/flow.rs.