Agc improvements and improve gain control stability#882

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UnknownSuperficialNight:agc-improvements-and-bug-fix

Commits on May 1, 2026

refactor: Modernise AGC state management and improve gain control stability
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fix: Use `current_gain` as fallback during silence in AGC `rms_gain` calculation
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fix: clamp peak_level to 1.0 to prevent decoder artifacts
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Commits on May 2, 2026

fix: clamp `rms` to `1.0` to prevent decoder artifacts
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Commits on May 6, 2026

chore: Increase `RMS_WINDOW_SIZE` to `1024` samples
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