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obd-poller asks 0x7DF for the nine obd2 signals, only while the bus is alive, and publishes envelopes stamped with the reply's kernel time. The recorder subscribes to yukart/vehicle/* and writes vehicle.ndjson beside the frames. Tested against a fake ECU on vcan0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz