SPI behavior updates for openpilot #2321
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- SPI _wait_for_ack: default timeout=0 to 500ms, clamp to 100-500ms range - SPI _transfer: default timeout=0 to 500ms, add MAX_TIMEOUT_RETRIES (5) limit - SPI _transfer: add NACK backoff like C++ implementation - SPI _transfer: run recovery logic for ALL exception types (fixes onroad test) - CAN can_recv: max 3 retries instead of infinite loop, return [] on failure - CAN can_send_many: detect no-progress and drop after 3 retries - CAN_SEND_TIMEOUT_MS: changed from 10ms to 5ms to match C++ These changes align Python behavior with the C++ pandad implementation. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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goes with commaai/openpilot#35854