feat(composition): dive world assembled from a selected site definition

The calibration site spawn sat 16 m from the south bounds edge, inside the
40 m warning margin. The vehicle_test recipe now extends the terrain and
playable bounds 42 m to the south so the spawn is inside the zone.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

game/presentation/cockpit/cockpit_hud.tscn

@@ -57,6 +57,27 @@ theme_override_font_sizes/font_size = 20
 text = "ALERTE · ATTENTION"
 horizontal_alignment = 1
 
+[node name="BoundsPanel" type="PanelContainer" parent="."]
+unique_name_in_owner = true
+visible = false
+layout_mode = 1
+anchors_preset = 10
+anchor_right = 1.0
+offset_left = 560.0
+offset_top = 88.0
+offset_right = -560.0
+offset_bottom = 136.0
+grow_horizontal = 2
+theme_override_styles/panel = SubResource("AlertStyle")
+
+[node name="BoundsLabel" type="Label" parent="BoundsPanel"]
+unique_name_in_owner = true
+layout_mode = 2
+theme_override_colors/font_color = Color(1, 0.82, 0.42, 1)
+theme_override_font_sizes/font_size = 18
+text = "LIMITE DE ZONE"
+horizontal_alignment = 1
+
 [node name="EjectionPanel" type="PanelContainer" parent="."]
 unique_name_in_owner = true
 visible = false