History of scheduler 2 changes

In crates/hub/src/flow.rs, lines 1217–1231 on 8aafd2023decfd2ce80727176547f3bd8c58f0c24b0311819202489f4d882537. 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 1217,1231:crates/hub/src/flow.rs.