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cfbeea9983
Replace byte-at-a-time read_byte() calls with batched read_array() in loop(). Each read_byte() internally chains through read_array(data, 1) -> check_read_timeout_(1) -> available(), resulting in ~3 UART driver calls per byte. Batching into a 64-byte stack buffer reduces this to ~3 calls per loop iteration regardless of how many bytes are available. Also uses vector insert() for bulk append instead of per-byte push_back(), and caps reads to remaining buffer capacity upfront to avoid over-reading from UART.
