ADR-102 Step 3 (FP-rate validation) — `nbvi_select_top_k` no longer
takes the literal top-K. Evaluates candidate K ∈ {6,8,10,12,16,20}
over the quiet window: for each, computes per-subset broadband CV
on a sliding sub-window and counts how many sub-windows cross the
moving threshold (0.10). Picks smallest K with fewest "false
positives" (ties broken by smallest total-NBVI). Defends against
the rare case where the literal top-12 happens to include a
subcarrier overlapping a noise source — the FP count surfaces it
and a tighter K wins.
ADR-104 (off-axis presence via per-subcarrier drift) — when
baseline.json carries `per_subcarrier_mean` for a node, server
loads the vector into AMP_BASELINE_PER_SUB. Each classifier tick
computes `drift = mean |Δ amp / baseline|` over the recent
AMP_SHORT_WIN frames vs that baseline. Drift ≥ 10 % → trigger
`present_still` even if broadband mean barely shifted. Catches the
case where the operator is in the room but off the AP→sensor line,
so individual subcarriers are perturbed without a global drop.
amp_node_level / amp_node_snapshot — per-node drift trigger
amp_classify_from_latest — cross-node MAX drift trigger
Drift channel is opportunistic: if baseline.json predates ADR-104
(no per_subcarrier_mean field), drift = 0 and classifier behaves
exactly as before. Re-record baseline via the calibrate-empty button
to populate the field and activate the channel.
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