The nvs_config.c fallback (15.0f) was never reached because
Kconfig always defines CONFIG_EDGE_FALL_THRESH. The Kconfig
default was still 2000 (=2.0 rad/s²), causing false fall alerts
on real WiFi CSI data (7 alerts in 45s).
Fixed to 15000 (=15.0 rad/s²). Verified on real ESP32-S3 hardware
with live WiFi CSI: 0 false fall alerts in 60s / 1300+ frames.
Co-Authored-By: claude-flow <ruv@ruv.net>