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b52f9715bf
Add automatic gain control (AGC) before Goertzel processing to normalize quiet audio from direct sampling mode where the -g gain flag has no effect. Fix broken adaptive threshold bootstrap by adding a 50-block warm-up phase that collects magnitude statistics before seeding noise floor and signal peak. Lower threshold ratio from 50% to 30% for better weak-CW sensitivity. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>