Fix CS16 capture, CLI tools while connected, sample-rate range, stdout banner
- CS16 streams read into an int16 buffer; files hold raw SC16 Q11 (full scale 2048) instead of all zeros - bladeRF-cli backed tools release the USB claim while they run and restore RX/TX settings afterwards; loopback uses the plugin setting - calibrate_dc runs "calibrate lms" + "calibrate dc rxtx"; a bare "cal dc" only printed help and reported success - report the span of all SoapySDR ranges (rate was capped at 10 Msps) - parse "Firmware version" from bladeRF-cli 1.10 - startup banner goes to stderr, off the stdio JSON-RPC channel - shared RX chunk reader: settle discard, overflow and stall handling, stream always closed; captures report overflows, clipping, peak dBFS - spectrum power normalized to dBFS - unit tests, README troubleshooting, version 2026.10.25
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