The 40 Hz gamma flicker is now Kconfig-gated (default y, unchanged
behaviour). Set CONFIG_LED_GAMMA_VIZ=n for a dark, lower-power boot (the
LED is simply cleared) — important for photosensitive deployments, no
source edit needed. The colormap saturation point is now operator-tunable
via CONFIG_LED_MOTION_FULLSCALE_MILLI (default 250 = 0.25).
Build + flash confirmed on ESP32-S3 N16R8 (COM8): default y still arms the
gamma timer, CSI flows. ADR-183 updated (gate moved from follow-up to done).