Kernel-filtered read-only socket; booleans on change, numbers <= 20/s, every
live value refreshed once a second, stale after 1 s of silence. --replay runs
a candump log through the same path, --list prints the layouts. obd-poller
drops engine_rpm, now a z27ag signal.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz
