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

scripts/deploy-gnss.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# Build gnss natively on the development Orin and install it on the car Orin as
+# yukart-gnss: scripts/deploy-native.sh does the work.
+#
+#   usage: scripts/deploy-gnss.sh [host]       (default: mikkeli-orin-nano)
+exec "$(dirname "$0")/deploy-native.sh" gnss "$@"