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-gnss.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=Yukart gnss: the receiver's fix on the bus, as single values
+Documentation=gitea:yukart/svc-core
+# Tier 2. Ordered after the broker and gpsd; it reconnects to either by itself.
+After=mosquitto.service gpsd.service
+StartLimitIntervalSec=0
+
+[Service]
+User=mikkeli
+ExecStart=/usr/local/bin/yukart-gnss
+Restart=always
+RestartSec=2
+
+[Install]
+WantedBy=multi-user.target