History of tiers 3 changes

In crates/flow/src/runner.rs, lines 294–313 on b11e30f5031de89d52b3ce43304cc79231fb824b6c27217aefec049ebdf7b813. 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 294,313:crates/flow/src/runner.rs.