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Map logical /dev/console fds to the primary sink fd for select. This avoids probing UART1/UART2 for stdout/stderr and keeps UART select state consistent. Add stdio regression checks for logical fd mapping and symmetric uart_end_select teardown.
| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-H21 | ESP32-H4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
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