History of preflight 1 change

In crates/flow/src/runner.rs, lines 515–534 on 6a2d31568cf2217c7cd40bd5bb97ecb469cd311e485a5ffe3f85d98d477a0661. 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 515,534:crates/flow/src/runner.rs.