History of scheduler 2 changes

In crates/hub/src/flow.rs, lines 1597–1611 on c95446a17fddd892eaaa5513071c20ea4d154b748a7e0df5116d8e067ef834b2. 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 1597,1611:crates/hub/src/flow.rs.