History of tiers 3 changes

In crates/flow/src/runner.rs, lines 333–352 on d60aac6c3f8a202bee8d9a980d2cdb28fbf97f4940306452410a8087cbb10697. 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 333,352:crates/flow/src/runner.rs.