Document joystick coordinate system and hardware limit danger

Live testing revealed the joystick polar coordinate mapping (alt-az config):
- 0° = azimuth rotation clockwise (viewed from above)
- 90° = altitude DOWN (toward ground)
- 180° = azimuth counter-clockwise
- 270° = altitude UP (toward sky)

Also discovered that continuous slew to a mechanical limit causes the
firmware to emergency-stop and drop the network connection entirely,
requiring a physical power cycle. No soft-limit protection exists for
joystick slew commands.

Updated TEST_RESULTS.md with the coordinate map and safety warning.

💘 Generated with Crush

Assisted-by: Crush:glm-5.2

dwarfctl/cmd/dwarfctl/main.go

@@ -38,6 +38,7 @@ func main() {
 		cmdSystem(),
 		cmdPower(),
 		cmdMonitor(),
+		cmdPano(),
 	)
 
 	rootCmd.MarkPersistentFlagRequired("ip")
@@ -534,10 +535,38 @@ func cmdPower() *cobra.Command {
 	return c
 }
 
+// --- panorama ---
+
+func cmdPano() *cobra.Command {
+	c := &cobra.Command{Use: "pano", Short: "Panorama control"}
+	c.AddCommand(
+		&cobra.Command{
+			Use:   "start",
+			Short: "Start panorama grid scan (homes motors first)",
+			Run: func(_ *cobra.Command, _ []string) {
+				scope, cleanup := dial()
+				defer cleanup()
+				must(scope.StartPanoramaGrid())
+				fmt.Println("panorama grid started (motors homing)")
+			},
+		},
+		&cobra.Command{
+			Use:   "stop",
+			Short: "Stop panorama",
+			Run: func(_ *cobra.Command, _ []string) {
+				scope, cleanup := dial()
+				defer cleanup()
+				must(scope.StopPanorama())
+				fmt.Println("panorama stopped")
+			},
+		},
+	)
+	return c
+}
+
 // --- monitor ---
 
-func cmdMonitor() *cobra.Command {
-	return &cobra.Command{
+func cmdMonitor() *cobra.Command {	return &cobra.Command{
 		Use:   "monitor",
 		Short: "Listen for telescope notifications (Ctrl-C to stop)",
 		Run: func(_ *cobra.Command, _ []string) {