History of tiers 3 changes

In crates/flow/src/runner.rs, lines 444–463 on 1408324d5d555b700a11015f155f7be1d7933349f36a49e22ccea2ecb868da85. 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 444,463:crates/flow/src/runner.rs.