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/Shooting/FxShrink.cs

@@ -0,0 +1,26 @@
+using UnityEngine;
+
+// Tiny self-animating effect: squeezes the object's X/Z to nothing (and stretches Y) over
+// `duration`, then destroys it. Used for the target spawn beam.
+public class FxShrink : MonoBehaviour
+{
+    public float duration = 0.45f;
+    public float stretch = 1.6f;
+
+    Vector3 startScale;
+    float startTime;
+
+    void Start()
+    {
+        startScale = transform.localScale;
+        startTime = Time.time;
+    }
+
+    void Update()
+    {
+        float t = Mathf.Clamp01((Time.time - startTime) / duration);
+        float squeeze = 1f - t * t;
+        transform.localScale = new Vector3(startScale.x * squeeze, startScale.y * Mathf.Lerp(1f, stretch, t), startScale.z * squeeze);
+        if (t >= 1f) Destroy(gameObject);
+    }
+}