Client: StagingAmbiance dev component (ArtStaging Play-mode juice)

Light-only ambiance animator (caustics spin, beacon flicker, bioluminescent
pulse); self-wires by name; no material writes so nothing persists on Play exit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Scripts/Client/Presentation/StagingAmbiance.cs

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+using UnityEngine;
+
+namespace ProjectM.Client
+{
+    /// <summary>
+    /// Dev-only ambiance animator for the ArtStaging scene. Play-mode; modulates LIGHTS only
+    /// (no material/asset writes) so nothing persists on Play exit. Self-wires by object name.
+    /// </summary>
+    [DisallowMultipleComponent]
+    public sealed class StagingAmbiance : MonoBehaviour
+    {
+        [Header("Caustics")]
+        public float causticsSpinDegPerSec = 4f;
+
+        [Header("Warm beacon flicker")]
+        public float beaconFlickerAmount = 0.06f;
+
+        [Header("Bioluminescent pulse")]
+        public float floraPulseAmount = 0.22f;
+        public float floraPulseSpeed = 1.4f;
+
+        Transform _caustics;
+        Light _beacon; float _beaconBase;
+        Light[] _flora; float[] _floraBase;
+
+        void Awake()
+        {
+            var c = GameObject.Find("CausticsSpot");
+            if (c != null) _caustics = c.transform;
+
+            var b = GameObject.Find("WarmPool");
+            if (b != null) { _beacon = b.GetComponent<Light>(); if (_beacon != null) _beaconBase = _beacon.intensity; }
+
+            var fl = GameObject.Find("FloraLights");
+            if (fl != null)
+            {
+                _flora = fl.GetComponentsInChildren<Light>();
+                _floraBase = new float[_flora.Length];
+                for (int i = 0; i < _flora.Length; i++) _floraBase[i] = _flora[i].intensity;
+            }
+        }
+
+        void Update()
+        {
+            float t = Time.time;
+
+            if (_caustics != null)
+                _caustics.Rotate(0f, causticsSpinDegPerSec * Time.deltaTime, 0f, Space.World);
+
+            if (_beacon != null)
+                _beacon.intensity = _beaconBase * (1f
+                    + beaconFlickerAmount * Mathf.Sin(t * 7.3f)
+                    + beaconFlickerAmount * 0.5f * Mathf.Sin(t * 17.1f));
+
+            if (_flora != null)
+                for (int i = 0; i < _flora.Length; i++)
+                {
+                    float phase = i * 1.7f;
+                    _flora[i].intensity = _floraBase[i]
+                        * (1f + floraPulseAmount * Mathf.Sin(t * floraPulseSpeed + phase));
+                }
+        }
+    }
+}

Assets/_Project/Scripts/Client/Presentation/StagingAmbiance.cs.meta

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+fileFormatVersion: 2
+guid: abe491d4d98103f4ab08712d8a78a1eb