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/RiveLoginController.cs

@@ -77,8 +77,11 @@ public class RiveLoginController : MonoBehaviour
             ? usernameInput.text.Trim()
             : string.Empty;
 
+        Debug.Log($"[RiveLoginController] StartMultiplayerSession called. Username length: {username.Length}");
+
         if (string.IsNullOrWhiteSpace(username))
         {
+            Debug.LogWarning("[RiveLoginController] Client start blocked because the username is empty.");
             if (loginUI != null && loginUI.errorText != null)
             {
                 loginUI.errorText.text = "Enter a username";
@@ -93,10 +96,14 @@ public class RiveLoginController : MonoBehaviour
 
         ChatAuthenticator auth = NetworkManager.singleton.GetComponent<ChatAuthenticator>();
         if (auth != null)
+        {
+            Debug.Log("[RiveLoginController] Assigning username to ChatAuthenticator.");
             auth.SetPlayerName(username);
+        }
         else
             Debug.LogWarning("RiveLoginController: ChatAuthenticator not found on NetworkManager");
 
+        Debug.Log($"[RiveLoginController] Starting client. Network address: '{NetworkManager.singleton.networkAddress}'");
         NetworkManager.singleton.StartClient();
     }
 }