fix: prevent ESP32 KISS modem stalls under USB backpressure#2812
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fix: prevent ESP32 KISS modem stalls under USB backpressure#2812ViezeVingertjes wants to merge 2 commits into
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Switch ESP32-S3 KISS modem environments to HWCDC and move outbound KISS writes to a non-blocking queued frame path so loop() and TX completion keep progressing when the host reads slowly. Add native backpressure regression tests and correct the native_kiss_modem test filter so this suite runs directly with pio test.
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The new test_kiss_modem suite needs KissModem headers and sources that only native_kiss_modem provides. Scope native to test_utils and run both envs in the unit test workflow.
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Switch ESP32-S3 KISS modem environments to HWCDC and move outbound KISS writes to a non-blocking queued frame path so loop() and TX completion keep progressing when the host reads slowly. Add native backpressure regression tests and correct the native_kiss_modem test filter so this suite runs directly with pio test.