Add practice range: shooting, AK47, intro cinematic, dressed warehouse scene

- PortalTestDestination practice range: Valorant-style hitscan rifle (recoil,
  spray/bloom, reload, controller support), debug HUD, practice-dummy targets
  with head/body hitboxes, hit/death/respawn animations, procedural SFX/FX
- AK47 model (Quaternius, CC0) held via Animator IK, with fire/reload/equip anims
- Intro cinematic (camera shots, title card, target beam-in, GO hand-off)
- Scene dressing editor pass: CC0 textures, props, warehouse roof, lighting and
  post-processing; custom stylized skybox shader
- CharacterMovement: camera recoil, shoulder offset, cinematic control lock
- Unity CLI pipeline package; plus in-progress chat/Rive/player changes

Asset credits: Assets/Models/Props/PROPS_CREDITS.txt (3 CC-BY 3.0 props),
Assets/Textures/Range/TEXTURES_LICENSE.txt, Assets/Resources/*/..._LICENSE.txt

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

Assets/Scripts/RiveNavigationController.cs

@@ -5,8 +5,8 @@ using System.Reflection.Metadata;
 using UnityEngine;
 using UnityEngine.InputSystem;
 
-/// Sends keyboard navigation commands to the Rive menu and
-/// activates the Play option when Enter is pressed
+/// Sends keyboard and gamepad navigation commands to the Rive menu and
+/// activates the Play option when Enter/gamepad confirm is pressed
 public class RiveNavigationController : MonoBehaviour
 {
     [Header("Rive")]
@@ -83,25 +83,42 @@ public class RiveNavigationController : MonoBehaviour
     private void Update()
     {
         Keyboard keyboard = Keyboard.current;
+        Gamepad gamepad = Gamepad.current;
 
-        if (keyboard == null)
-            return;
+        bool movedRight = false;
+        bool movedLeft = false;
+        bool confirmPressed = false;
 
-        if (keyboard.rightArrowKey.wasPressedThisFrame)
+        if (keyboard != null)
+        {
+            movedRight |= keyboard.rightArrowKey.wasPressedThisFrame;
+            movedLeft |= keyboard.leftArrowKey.wasPressedThisFrame;
+            confirmPressed |= keyboard.enterKey.wasPressedThisFrame || keyboard.numpadEnterKey.wasPressedThisFrame;
+        }
+
+        if (gamepad != null)
+        {
+            // D-pad and left stick both move the selection — leftStick.left/right are the
+            // Input System's built-in synthetic buttons derived from the stick's deflection,
+            // so this fires once per push just like a button, not continuously while held.
+            movedRight |= gamepad.dpad.right.wasPressedThisFrame || gamepad.leftStick.right.wasPressedThisFrame;
+            movedLeft |= gamepad.dpad.left.wasPressedThisFrame || gamepad.leftStick.left.wasPressedThisFrame;
+            confirmPressed |= gamepad.buttonSouth.wasPressedThisFrame;
+        }
+
+        if (movedRight)
         {
             MoveSelection(+1);
             nextTrigger?.Trigger();
         }
 
-        if (keyboard.leftArrowKey.wasPressedThisFrame)
+        if (movedLeft)
         {
             MoveSelection(-1);
             previousTrigger?.Trigger();
         }
 
-        bool enterPressed = keyboard.enterKey.wasPressedThisFrame || keyboard.numpadEnterKey.wasPressedThisFrame;
-
-        if (enterPressed && selectedIndex == PlayIndex)
+        if (confirmPressed && selectedIndex == PlayIndex)
         {
             if (sceneTransitionController == null)
             {