Continuation of ADR-105 (no synthetic outputs in production runtime).
The 20×20 SignalField heatmap was generated by mapping subcarrier
index k to angle 2π·k/N and dropping a Gaussian hotspot — a totally
fabricated spatial layout. A single sensor has no directional info
so the resulting heatmap had no correspondence to where anything
actually was in the room; UI showed believable-looking but
physically meaningless hotspots. Operator asked for boots-on-the-
ground honesty.
`generate_signal_field` now returns a zero-filled 20×1×20 grid. UI
renders blank, which is the truthful state until a real multistatic
localizer is wired (multi-AP attention from ADR-008 or the
`MultistaticFuser` already in code).
Audit of remaining fields confirmed they are either:
- already gated on real data (vital_signs returns None when br < 1 BPM,
persons/pose_keypoints/posture/signal_quality_score all None without
model loaded),
- or processed from real CSI (classification, features.mean_rssi,
features.variance, enhanced_motion when multi-AP pipeline active).
`--source simulate` was already disabled by an earlier change
(exit code 2). `--pretrain` and `--train` synthetic fallbacks remain
in code as developer tools but never touch the runtime sensing path.
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