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Applies the explicit ADC-dynamics/HPF (REG20-23) + mic-ALC/power (REG47-4C) writes the Linux es7210 driver makes, which the LilyGO/ESP-ADF init leaves at reset defaults. Added while chasing an asymmetric-THD theory; the dominant garble was later proven to be acoustic feedback, so the benefit of these writes is UNVERIFIED. DO NOT MERGE until A/B-tested against a clean acoustic source — origin/main is the 'without' baseline. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UWZuYkHBRqNb6BZHV8sTG5