History of tiers 3 changes

In crates/flow/src/runner.rs, lines 392–411 on 66a7e708b3773fb01a5f593d5ee888795030f9094646d2fa124086b5ca552057. 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 392,411:crates/flow/src/runner.rs.