Add Movement library integration with comprehensive test environment: include Movement.csproj reference, create LibraryTest scene with player controller, multiple test areas (bunny hop platforms, surf ramps, vertical tower, speed corridor), advanced lighting setup, input mappings for WASD/gamepad movement controls, and DebugHUD integration

Scenes/UI/DebugHUD.tscn

@@ -0,0 +1,65 @@
+[gd_scene load_steps=2 format=3 uid="uid://cx3oppvfp20t"]
+
+[ext_resource type="Script" path="res://Scripts/UI/DebugHUD.cs" id="1_script"]
+
+[node name="DebugHUD" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_script")
+
+[node name="StatsPanel" type="PanelContainer" parent="."]
+layout_mode = 1
+anchors_preset = 2
+anchor_top = 1.0
+anchor_bottom = 1.0
+offset_left = 5.0
+offset_top = -125.0
+offset_right = 205.0
+offset_bottom = -5.0
+grow_vertical = 0
+
+[node name="VBoxContainerLabels" type="VBoxContainer" parent="StatsPanel"]
+layout_mode = 2
+size_flags_horizontal = 0
+alignment = 1
+
+[node name="SpeedLabel" type="Label" parent="StatsPanel/VBoxContainerLabels"]
+layout_mode = 2
+text = " Speed:"
+
+[node name="StateLabel" type="Label" parent="StatsPanel/VBoxContainerLabels"]
+layout_mode = 2
+text = " State:"
+
+[node name="PositionLabel" type="Label" parent="StatsPanel/VBoxContainerLabels"]
+layout_mode = 2
+text = " Position:"
+
+[node name="VelocityLabel" type="Label" parent="StatsPanel/VBoxContainerLabels"]
+layout_mode = 2
+text = " Velocity:"
+
+[node name="VBoxContainerValues" type="VBoxContainer" parent="StatsPanel"]
+layout_mode = 2
+size_flags_horizontal = 8
+alignment = 1
+
+[node name="SpeedVal" type="Label" parent="StatsPanel/VBoxContainerValues"]
+layout_mode = 2
+text = "0.0 u/s"
+
+[node name="StateVal" type="Label" parent="StatsPanel/VBoxContainerValues"]
+layout_mode = 2
+text = "Idle"
+
+[node name="PositionVal" type="Label" parent="StatsPanel/VBoxContainerValues"]
+layout_mode = 2
+text = "(0, 0, 0)"
+
+[node name="VelocityVal" type="Label" parent="StatsPanel/VBoxContainerValues"]
+layout_mode = 2
+text = "(0, 0, 0)"