simulate_rssi_measurements always returned vec![], so every survivor got
location: None, which disabled spatial dedup — one person re-detected across N
scan cycles became N survivors, fabricating a mass-casualty event. Two fixes:
1. Real RSSI source: SensorPosition gains an optional last_rssi (populated by the
hardware layer from actual signal-strength readings). collect_rssi_measurements
reads only real per-sensor RSSI and feeds the existing triangulator; it NEVER
fabricates a value. <min_sensors real readings -> None location (honest).
2. Zone + vitals-signature dedup: when no usable location exists, record_detection
matches an existing active, un-located survivor in the same zone whose latest
vital signature (breathing presence + START rate band, heartbeat presence,
movement class) is compatible — collapsing repeat detections of one person while
keeping genuinely distinct survivors (different rate bands) separate.
Tests (fail on old code): 3x identical-vitals/None-location -> 1 survivor (was 3);
distinct vitals stay 2; real-RSSI path yields a position; no-RSSI path yields None.
Co-Authored-By: claude-flow <ruv@ruv.net>
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