History of scheduler 2 changes

In crates/hub/src/flow.rs, lines 2749–2763 on 951aed50c2f5854e52d81f28953e61194b4f20492918fe9bbb1ed6c8fd1e64cc. 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 2749,2763:crates/hub/src/flow.rs.