The relief snapshot was still global: a smart plan finishing while a retarget job waited could replace Sim::known_relief, so the pending route was planned on the newer map. RouteJob now carries Arc<KnownRelief> for its knowledge version; Sim::known_relief keeps the same Arc only to seed new jobs. retarget_relief reads the job's snapshot, and relief sampling, price grids and route caches are keyed by that version. The new regression makes a job wait, swaps the global relief for another grid with a wall, and checks the pending route and sample stay those of the original version; outside its grid is Unknown. Core release, adapter and WASM contract pass.
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