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- Call validate_sdr() at startup and abort on errors (SDR.md §11) - Build SoapySdrRig with full [[sdr.channels]] config when access_type is "sdr"; subscribe to its primary-channel PCM sender before handing the pre-built rig to the rig task via RigTaskConfig.prebuilt_rig - Skip cpal capture when an SDR audio source is available; bridge the SdrPipeline PCM broadcast into pcm_tx so all decoder tasks are unchanged - Add trx-backend-soapysdr optional dep and soapysdr feature to trx-server - Add prebuilt_rig field to RigTaskConfig so rig_task skips the registry factory when a pre-built rig is supplied by main Marks SDR-08 complete. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Signed-off-by: Stan Grams <sjg@haxx.space>