feat: add session-gated TG3 data collection

tg3_local_teleop/tg3-data-recorder.service

@@ -0,0 +1,23 @@
+[Unit]
+Description=TG3 independent teleoperation MCAP recorder supervisor
+After=network-online.target
+Wants=network-online.target
+Before=tg3-local-teleop.service
+
+[Service]
+Type=simple
+WorkingDirectory=/home/nvidia/tg3_local_teleop
+UMask=0027
+ExecStartPre=/home/nvidia/tg3_local_teleop/wait_ros_ready.sh
+ExecStart=/home/nvidia/tg3_local_teleop/run_data_recorder.sh
+Restart=on-failure
+RestartSec=2
+KillSignal=SIGINT
+# Signal only the Python supervisor first; it owns clean SIGINT/finalization
+# of rosbag2.  The whole cgroup is still killed if the generous deadline ends.
+KillMode=mixed
+TimeoutStartSec=150
+TimeoutStopSec=150
+
+[Install]
+WantedBy=default.target