After ADR-100 gain-lock reveals a clean baseline, the broadband CV of
mean amplitude separates EMPTY/STILL/WALK by 3-6× on the operator's
deployment where RSSI MAD-Δ overlapped within noise. Adds:
amp_presence_override(node_id, amps) — per-frame: rolling 4.5 s
short window for CV, 60 s long window for 95th-percentile baseline,
cross-node fusion (MAX CV gate, ANY baseline-drop → still),
3 s motion hysteresis to bridge step pauses.
amp_classify_from_latest() — readonly fusion for feature_state
(0xC5110006) and adaptive-model paths that don't carry raw amps.
Wired into the three SensingUpdate-producing paths (raw CSI,
feature_state, adaptive model). Marks rssi_presence_override as
dead_code, kept for reference.
Live test (10 samples @ 3 s):
walk: present_moving, CV 41-53 %, sustained through pauses
stop: absent (CV 4-8 %) after 3 s hold expires
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