Implement UDS Service 0x22 (Read Data By Identifier) with support for:
- Engine ECU (0x7E0): boost pressure, fuel rail pressure, lambda, torque,
wastegate position, ignition timing, knock correction per cylinder
- DSG Transmission (0x7E1): current gear, selector position, oil temp
- Instrument Cluster (0x714): RPM, ambient light sensor
Also adds ECU_EMULATOR_SPEC.md with full protocol documentation.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
