Decode Nintendo HD-rumble words once in firmware into conventional low/high magnitudes and normalize stripped control SET_REPORT vs complete interrupt OUT reports through one path.
- Add UART_PROTOCOL_VERSION=2, IMUSample dataclass, conversion constants - Rewrite SwitchReport.to_bytes() for versioned v2 framing with checksum - Add ACCEL_LSB_PER_G=4096, GYRO_LSB_PER_RAD_S=818.5, MS2_PER_G constants - Add SENSOR_ACCEL/SENSOR_GYRO SDL type constants with fallback - Add protocol round-trip tests (8 tests, all passing)
