History of scheduler 2 changes

In crates/hub/src/flow.rs, lines 2551–2565 on 439ecd8708a13ffd255537fab186ab2b3f49ef9f6a8684d55b0b294d434d6ab7. 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 2551,2565:crates/hub/src/flow.rs.