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Catalogues 5 biometric primitives in CSI that survive cross-environment transfer by physical construction (not just statistical learning), with quantified discriminability: | Primitive | Bits | Invariance | |------------------------------------|-----:|------------| | Gait stride frequency | 5 | HIGH | | Breathing rate + envelope | 5 | HIGH | | HRV (rate-level only) | 4 | HIGH at rate, LOW at contour | | Body-size RCS frequency response | 4 | MEDIUM (needs calibration target) | | Walking dynamics (limb timing) | 7 | HIGH (if pose works cross-room) | Composite biometric strength: ~12-15 bits realistic vs 25-bit independence upper bound. Enough for household + building-scale ID; insufficient for forensic / city-scale. R15 strengthens the R14/R3/ADR-105 privacy framework: RF biometric is PHYSICAL not learned, so the same primitive that enables empathic appliances is a surveillance primitive that's harder to opt out of than visual ID. There is no behavioural countermeasure short of jamming (illegal) or physical alteration (impossible). Surfaces required amendment to ADR-105 federation protocol: 'The federation aggregator MUST NOT receive any raw per-subject biometric primitive. It MAY receive aggregated, MERIDIAN-normalised model deltas. Per-subject primitives stay on-device.' This becomes the requirements basis for ADR-106 (deferred DP-SGD ADR). R15 closes the last unaddressed PROGRESS.md research thread. After R15: - Closed: 'what RF biometrics exist and how do they invariantise' = answered - Open: ADR-106, R6.1 multi-scatterer, R3 physics-informed env prediction, R6.2 Fresnel-aware antenna placement The per-occupant feature surface (R14 V1/V2/V3) is now fully grounded in physics + constraints; remaining work is implementation, not research. Composes with every prior thread: - R5 saliency: primitive-specific maps - R6 Fresnel: physical basis for RCS invariance - R7 mincut: defends primitive-level poisoning - R10 per-species gait: transfers to per-individual gait biometric - R13 NEGATIVE: 5-dB-short wall rules out contour-level HRV - R3: embedding space combines 5 primitives - R14: all 3 verticals (V1/V2/V3) work with rate-level subset Honest scope: - Bit counts are upper bounds; 30-50% loss to noise/multipath - Contour-level HRV not achievable (R13 wall) - Walking dynamics 7-bit assumes pose-from-CSI works cross-room (unmeasured) - Body-size RCS needs calibration target in new room Coordination: ticks/tick-14.md, no PROGRESS.md edit.