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901192cca1
Read all available bytes in batches via read_array() instead of byte-at-a-time read() calls. Each read() internally chains through read_byte -> read_array(1) -> check_read_timeout_ -> available(), resulting in 3 UART calls per byte. At 256000 baud with ~235 bytes per loop iteration, this was ~706 UART operations per loop call. Batching reduces this to ~12. Measured 33% reduction in loop time (2348ms -> 1577ms per 60s).
