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- cpal is now behind an 'audio' feature flag (off by default) - --live mode requires --features audio at build time - --send-tone and --record work on headless servers without audio libs - Linux build script no longer installs libasound2-dev Build for headless: cargo build --release Build with mic/speakers: cargo build --release --features audio Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>