obd-poller over the K-line via the Bluetooth ELM327; gnss publisher; elm_connected

obd-poller drops its CAN socket: the Z27AG answers OBD-II only on ISO 9141-2.
It holds a raw RFCOMM link to the ELM (no pairing, no root), fixes the protocol
(ATSP3) so nothing probes CAN, publishes the obd_* signals, and releases the
adapter after a minute of ECU silence so it can sleep.
gnss: gpsd's fix as yukart/gnss/<signal>. orin-status: elm_connected from BlueZ.
One native deploy script (deploy-native.sh BIN) behind the per-service ones;
/etc/default/yukart-elm holds the adapter's address.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

deploy/yukart-orin-status.service

@@ -9,7 +9,9 @@ StartLimitIntervalSec=0
 User=mikkeli
 # The UPS INA219 is on /dev/i2c-7, group i2c.
 SupplementaryGroups=i2c
-ExecStart=/usr/local/bin/yukart-orin-status
+# The ELM's address, for elm_connected; without the file nothing is reported.
+EnvironmentFile=-/etc/default/yukart-elm
+ExecStart=/usr/local/bin/yukart-orin-status --elm ${ELM_ADDR}
 Restart=always
 RestartSec=2