Add saltybot_can_e2e_test package with 64 tests covering the full
Orin↔Mamba↔VESC CAN pipeline: drive commands, heartbeat timeout,
e-stop escalation, mode switching, and FC_VESC status broadcasts.
Tests run with plain pytest — no ROS2 or real CAN hardware required.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>