History of tiers 3 changes

In crates/flow/src/runner.rs, lines 333–352 on ea81796bb757d87bf961a6e92044f84febf655d90b08c665c815d665fbaab873. 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.