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Document the TX-path work landed this session: - §4.6: polyphase FIR interpolator + sample-rate-scaled TX buffer + SoapyPlutoSDR confirmation of 32768 full-scale. - §4.8 (new): power-linear drive→atten mapping, full WDSP digital level, TX LO powerdown gated by PTT. - Phase 4 status updated. - Related fixes: per-band FM settings (SQL/CTCSS/step/repeater) restore on startup — was dropped by LoadDevice; affects all backends. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>