[ruvnet]

Summary

• Builds a validated physical scene from an API-verified Cognitum Spaces snapshot (placement bounds, object obstacles, zone speed ceiling, anonymous tracks) and turns a validated forecast branch into a labelled, confidence-0 `physical.hypothesis` simulation body for `POST /v1/spatial/spaces/{id}/simulations`.
• Trajectories are `points` objects, never arrays of arrays (Firestore rejects those; the API answers 500 instead of 400).
• A local snapshot file cannot build a scene; the snapshot must carry the API-verified `snapshotHash`.

Verified

• 6 new tests plus the existing worldgraph-pan2 and worldmodel suites pass.
• Round trip against the Firestore emulator passes.

Not verified

• No live production write: that needs a `spaces:simulate` key.
• The forecast is a labelled fixture; no real PAN 2 physical-forecast extractor exists yet.

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