Use when running any inference pathway on Airframe/Shimmy — GPU probing, CPU reference generation, per-tensor comparison, invariant certification. Covers candle_probe, vault_seed, layer_dump_gpu, invariant_probe, frontier_compare, quant_verify, and the airframe_observe observability stack.
Use when working with the Airframe golden vault (DuckDB), the airframe_observe observability crate, per-layer oracle/invariant comparison, or certifying GPU inference against CPU/candle references. Covers vault.duckdb schema, the ObservationSession fact/observer API, the seed/verify/certify scripts, and the inspect→reference→probe→compare→certify methodology. Reach for this when the task is "what does the vault say", "how do I compare layers", "how do facts flow", or "how do I certify a model" — as opposed to airframe-inference which answers "run tool X on model Y".