Added a basic vehicle status UI showing mode and a few key datapoints.

docs/vehicle_status.md

@@ -0,0 +1,30 @@
+# Vehicle status prototype
+
+Run `scenes/vehicle_status_demo.tscn` with F6. The controls switch between normal, warning, fault, and a stopped feed, plus high contrast and alert pulsing.
+
+Instance `components/vehicle_status_panel.tscn` for integration:
+
+```gdscript
+$VehicleStatusPanel.set_status("STATIONKEEP", 0, "", "Position hold active", "Thrusters enabled")
+$VehicleStatusPanel.set_telemetry(48.0, 18.2, 874.0, 34.0)
+# severity: 0 normal, 1 warning, 2 fault
+$VehicleStatusPanel.set_status("Enclosure overtemperature", 2, "TMP-003",
+	"68 °C · trip 65 °C · thrusters inhibited", "Inspect cooling before reset")
+```
+
+All sample fault codes, responses, and thresholds are illustrative. The UI displays reported vehicle status; gauge zones do not control the ROV or generate its faults.
+
+Configure each gauge in the scene Inspector. The numeric references use the voltage nominal or the other gauges' upper fault thresholds. Voltage marks 48 V at center; any deviation enters a yellow region.
+
+| Gauge | Display range | Warning zone | Fault zone |
+| --- | --- | --- | --- |
+| Voltage | 42–54 V | Either side of 48 V | Below 45 / above 51 V |
+| Current | 0–36 A | 24–30 A | Above 30 A |
+| Power | 0–1728 W | 1152–1440 W | Above 1440 W |
+| Internal temperature | 0–90 °C | 55–65 °C | Above 65 °C |
+
+Only 48 V nominal and 30 A were supplied. The other thresholds need confirmation; 1440 W is the provisional 48 × 30 reference. Markers clamp to the track, but numeric readings remain unclamped.
+
+Labels and containers own layout. `status_gauge.gd` draws tracks and markers; `vehicle_status_art.gd` draws the watermark and status background. Warning/fault backgrounds alternate shades once per second; `pulse_alerts` disables that behavior. After two seconds without telemetry, the status is marked STALE and readings are held. Colors come from the shared palette and generated themes.
+
+`mode_icon` selects the SVG watermark (stationkeep and ROV samples are in `assets/vector/status/`). Edit `ModeIcon` anchors, rotation, and size in the scene. Readings are right-aligned beside a fixed-width, left-aligned limits column. Off-phase warning/fault shades are derived in the shared palette.