preflight@1.0.0

Publisher claims: "Cheap verification and cost estimation gate before expensive, long-running, or irreversible operations. Identifies the cheapest verifiable version of the target operation, runs it, reports any bugs without stopping, estimates cost as a range (never a point value), lists residual risks using probability x impact columns, and stops for user confirmation before the real run begins. Use when about to train a model, batch process, loop over production data, or perform any operation that cannot be cleanly undone." Observed in sandbox: no network, touches nothing outside the project, writes no memory.