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25762c62f8
Replace byte-at-a-time read() calls with batched read_array() in all four UART read sites: receive_telegram_(), receive_encrypted_telegram_(), and two drain loops. Each read() 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 batch regardless of byte count. Extract drain_rx_buffer_() helper to deduplicate the two drain sites in ready_to_request_data_() and stop_requesting_data_().
