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Decision 30: CAN feeds displays, OBD-II (K-line via the ELM) calibrates, so every obd2 signal carries the obd_ prefix and the plain names are left for decoded ones. yukart/gnss/<signal> gives displays the fix as single values; gnss/fix stays for navigation. Boundary: reboot beside poweroff, same guards. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz