LANTERN realignment P3: one look everywhere + scene surgery

- PostFX_Lantern.asset: the ONE shared grade (ACES, bloom 0.6 cool-tinted for the
  HDR gloam, vignette 0.28, faint teal filter) applied to Game, DevSandbox, and
  ArtStaging; PostFX_DarkSciFi / PostFX_Daylight / Sky_DaytimeProcedural deleted.
- Env_SeabedKit.prefab: ArtStaging's environment (seabed, flora, rocks, marine
  snow, caustics, warm pool, gloam fill, key light, StagingAmbiance animator)
  prefab-ized and placed in Game + DevSandbox; ArtStaging connected to it.
- Scene surgery: old DevSandbox.unity deleted; Gym.unity RENAMED DevSandbox.unity
  (GUID preserved -> GymSub wiring + the F1/F2 dev scripts that gate on the
  'DevSandbox' name come back to life). SyntyWorld root deleted from DevSandbox;
  BaseBiome/ExpeditionBiome/Slot1 deleted from Game.
- RenderSettings unified: no skybox, Exp2 teal fog {0.02,0.10,0.12} @ 0.035, flat
  near-black ambient {0.03,0.055,0.08}; camera clearFlags -> solid deep-water.
- ScenePolicy.IsGameplayScene() replaces the six scene.name=="Game" string gates
  (Game + DevSandbox share the dynamic look; menu/ArtStaging untouched).
- WorldAtmosphereSystem rewritten as water-column murk (LANTERN defaults; biome
  variants re-meant to kelp/trench/gloam-bloom; Ground_Arid tint block deleted).

390 green; Play-verified in Game: murk values live, warm-vs-cold reads, no errors.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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Assets/_Project/Rendering/Sky_DaytimeProcedural.mat

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

@@ -72,7 +72,7 @@ namespace ProjectM.Client
 
         protected override void OnUpdate()
         {
-            if (UnityEngine.SceneManagement.SceneManager.GetActiveScene().name != "Game") { Hide(); return; }
+            if (!ScenePolicy.IsGameplayScene()) { Hide(); return; }
             if (_cam == null) _cam = Camera.main;
             if (_cam == null) return;
             if (!AmbientLifeConfig.Enabled) { Hide(); return; }

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

@@ -69,7 +69,7 @@ namespace ProjectM.Client
 
         protected override void OnUpdate()
         {
-            if (UnityEngine.SceneManagement.SceneManager.GetActiveScene().name != "Game") return;
+            if (!ScenePolicy.IsGameplayScene()) return;
             if (!DecalConfig.Enabled) { if (_tracked.Count > 0) ClearAll(); return; }
 
             EntityManager.CompleteDependencyBeforeRO<BlightClutter>();

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

@@ -55,7 +55,7 @@ namespace ProjectM.Client
 
         protected override void OnUpdate()
         {
-            if (UnityEngine.SceneManagement.SceneManager.GetActiveScene().name != "Game") return;
+            if (!ScenePolicy.IsGameplayScene()) return;
             var cfg = DynamicLightConfig.Instance;
             bool enabled = cfg == null || cfg.Enabled;
             if (!enabled)

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

@@ -50,7 +50,7 @@ namespace ProjectM.Client
 
         protected override void OnUpdate()
         {
-            if (UnityEngine.SceneManagement.SceneManager.GetActiveScene().name != "Game") return;
+            if (!ScenePolicy.IsGameplayScene()) return;
             if (_root == null) return;
 
             var cfg = RoomDressingConfig.Instance;

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

@@ -0,0 +1,19 @@
+using UnityEngine.SceneManagement;
+
+namespace ProjectM.Client
+{
+    /// <summary>
+    /// The ONE place client presentation systems ask "is this a gameplay-look scene?" — replaces the old
+    /// scattered <c>scene.name == "Game"</c> string gates (LANTERN realignment: Game and DevSandbox share
+    /// the same look; MainMenu/ArtStaging stay untouched by the dynamic look systems).
+    /// </summary>
+    public static class ScenePolicy
+    {
+        /// <summary>True in the scenes that carry the LANTERN gameplay look (Game + DevSandbox).</summary>
+        public static bool IsGameplayScene()
+        {
+            var name = SceneManager.GetActiveScene().name;
+            return name == "Game" || name == "DevSandbox";
+        }
+    }
+}

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

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+guid: f4e4ab296b48b204f866c561e9acd11d

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

@@ -62,7 +62,7 @@ namespace ProjectM.Client
 
         protected override void OnUpdate()
         {
-            if (UnityEngine.SceneManagement.SceneManager.GetActiveScene().name != "Game") { Pending.Clear(); return; }
+            if (!ScenePolicy.IsGameplayScene()) { Pending.Clear(); return; }
             if (!DecalConfig.Enabled)
             {
                 Pending.Clear();

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

@@ -4,31 +4,26 @@ using UnityEngine;
 namespace ProjectM.Client
 {
     /// <summary>
-    /// Client-only ATMOSPHERE cross-fade for the two-region world. A managed presentation system
-    /// (SystemBase, main thread, NO Burst) in <see cref="PresentationSystemGroup"/> that OBSERVES the
-    /// follow-camera's world-space X and lerps <see cref="RenderSettings"/> fog + Trilight sky-ambient between
-    /// the lush cyan meadow base (origin) and the hostile orange arid expedition (+1000 X) — mirroring
-    /// HudSystem's region split at camera X &gt; 500. The directional light + skybox + post-FX volume stay
-    /// GLOBAL; only fog colour/density + ambient sky colour shift per region. Pure presentation: never mutates
-    /// the simulation, no ECS query (camera + RenderSettings only). Knobs live in
-    /// <see cref="WorldAtmosphereConfig"/> (falls back to baked defaults when absent). Guarded to the gameplay
-    /// "Game" scene so it never restyles the menu. Fog enable/mode + equator/ground ambient are baked into the
-    /// scene; this only drives the per-region deltas. Phase 1.5b: also drives a per-room-biome tint on the
-    /// expedition ground quads (MaterialPropertyBlock — the material asset is never touched).
+    /// Client-only water-column ATMOSPHERE for the LANTERN seabed (deep-sea murk). A managed presentation
+    /// system (SystemBase, main thread, NO Burst) in <see cref="PresentationSystemGroup"/> that OBSERVES the
+    /// follow-camera's world-space X and lerps <see cref="RenderSettings"/> fog + flat ambient between the
+    /// base-shelf murk (origin) and the deeper out-shelf murk (+1000 X) — mirroring HudSystem's region split
+    /// at camera X &gt; 500. The skybox stays empty and the post-FX volume GLOBAL; only fog colour/density +
+    /// ambient shift per region. Pure presentation: never mutates the simulation. Knobs live in
+    /// <see cref="WorldAtmosphereConfig"/> (falls back to baked LANTERN-murk defaults when absent). Gated by
+    /// <see cref="ScenePolicy.IsGameplayScene"/> so it never restyles the menu or ArtStaging. Per-room-biome
+    /// murk variants key on the replicated RunInfo.CurrentBiome (re-meant to depth/water flavors — the old
+    /// meadow/arid/blight palettes died in the LANTERN realignment).
     /// </summary>
     [WorldSystemFilter(WorldSystemFilterFlags.ClientSimulation)]
     [UpdateInGroup(typeof(PresentationSystemGroup))]
     public partial class WorldAtmosphereSystem : SystemBase
     {
         Camera _cam;
-        MeshRenderer[] _ground;
-        MaterialPropertyBlock _mpb;
-        Color _groundCur;
-        static readonly int BaseColorId = Shader.PropertyToID("_BaseColor");
 
         protected override void OnUpdate()
         {
-            if (UnityEngine.SceneManagement.SceneManager.GetActiveScene().name != "Game") return;
+            if (!ScenePolicy.IsGameplayScene()) return;
             if (_cam == null) _cam = Camera.main;
             if (_cam == null) return;
 
@@ -36,39 +31,34 @@ namespace ProjectM.Client
             float boundary = cfg != null ? cfg.BoundaryX : 500f;
             float half = cfg != null ? Mathf.Max(1f, cfg.BlendHalfWidth) : 80f;
 
-            Color baseFog = cfg != null ? cfg.BaseFogColor : new Color(0.09f, 0.13f, 0.14f, 1f);
-            float baseDen = cfg != null ? cfg.BaseFogDensity : 0.010f;
-            Color baseAmb = cfg != null ? cfg.BaseAmbientSky : new Color(0.32f, 0.38f, 0.48f, 1f);
-            Color expFog = cfg != null ? cfg.ExpeditionFogColor : new Color(0.24f, 0.13f, 0.06f, 1f);
-            float expDen = cfg != null ? cfg.ExpeditionFogDensity : 0.016f;
-            Color expAmb = cfg != null ? cfg.ExpeditionAmbientSky : new Color(0.45f, 0.31f, 0.20f, 1f);
-            // Step 14 (expedition redesign): the EXPEDITION-side palette keys on the replicated per-room biome
-            // (RunInfo.CurrentBiome) so every room re-themes — the camera-X blend still owns the base↔run fade.
-            // Palettes are code consts (cosmetic; per-biome config knobs can layer on later without churn).
-            // Phase 1.5: all palettes moved to the dark-ambient set (dynamic lights carry readability).
-            // Ground tints are ABSOLUTE _BaseColor values (the MPB replaces the authored arid sand tint).
-            Color groundTarget = new Color(0.60f, 0.56f, 0.50f, 1f); // authored arid sand (Mat_Ground_Arid_Dark)
+            // LANTERN murk defaults (match the ArtStaging source-of-truth hues; density is the play-readability knob).
+            Color baseFog = cfg != null ? cfg.BaseFogColor : new Color(0.02f, 0.10f, 0.12f, 1f);
+            float baseDen = cfg != null ? cfg.BaseFogDensity : 0.035f;
+            Color baseAmb = cfg != null ? cfg.BaseAmbientSky : new Color(0.03f, 0.055f, 0.08f, 1f);
+            Color expFog = cfg != null ? cfg.ExpeditionFogColor : new Color(0.015f, 0.075f, 0.10f, 1f);
+            float expDen = cfg != null ? cfg.ExpeditionFogDensity : 0.04f;
+            Color expAmb = cfg != null ? cfg.ExpeditionAmbientSky : new Color(0.02f, 0.045f, 0.07f, 1f);
+
+            // Per-room murk flavors (cosmetic code consts; all stay inside the deep-sea band — hue shifts are
+            // subtle, value stays dark so dynamic lights keep carrying readability).
             bool haveRun = SystemAPI.TryGetSingleton<ProjectM.Simulation.RunInfo>(out var runInfo);
             if (haveRun && runInfo.Lifecycle != ProjectM.Simulation.RunLifecycle.Staging)
             {
                 switch (runInfo.CurrentBiome)
                 {
-                    case ProjectM.Simulation.RoomBiomeId.Meadow:
-                        expFog = new Color(0.10f, 0.16f, 0.10f, 1f); expDen = 0.012f;
-                        expAmb = new Color(0.30f, 0.42f, 0.32f, 1f);
-                        groundTarget = new Color(0.47f, 0.55f, 0.43f, 1f);
+                    case ProjectM.Simulation.RoomBiomeId.Meadow: // kelp shallows: a touch greener
+                        expFog = new Color(0.02f, 0.10f, 0.09f, 1f); expDen = 0.035f;
+                        expAmb = new Color(0.025f, 0.06f, 0.06f, 1f);
                         break;
-                    case ProjectM.Simulation.RoomBiomeId.Cavern:
-                        expFog = new Color(0.06f, 0.08f, 0.12f, 1f); expDen = 0.020f;
-                        expAmb = new Color(0.24f, 0.28f, 0.38f, 1f);
-                        groundTarget = new Color(0.42f, 0.46f, 0.55f, 1f);
+                    case ProjectM.Simulation.RoomBiomeId.Cavern: // crush-dark trench: colder + denser
+                        expFog = new Color(0.01f, 0.05f, 0.08f, 1f); expDen = 0.05f;
+                        expAmb = new Color(0.015f, 0.035f, 0.06f, 1f);
                         break;
-                    case ProjectM.Simulation.RoomBiomeId.Blight:
-                        expFog = new Color(0.13f, 0.07f, 0.15f, 1f); expDen = 0.022f;
-                        expAmb = new Color(0.32f, 0.24f, 0.38f, 1f);
-                        groundTarget = new Color(0.52f, 0.42f, 0.58f, 1f);
+                    case ProjectM.Simulation.RoomBiomeId.Blight: // gloam bloom: a sick green-violet cast
+                        expFog = new Color(0.045f, 0.075f, 0.09f, 1f); expDen = 0.045f;
+                        expAmb = new Color(0.045f, 0.05f, 0.075f, 1f);
                         break;
-                    // Arid keeps the config/default burnt-dusk orange + sand ground above.
+                    // default keeps the config/fallback out-shelf murk above.
                 }
             }
 
@@ -79,27 +69,6 @@ namespace ProjectM.Client
             RenderSettings.fogColor = Color.Lerp(baseFog, expFog, t);
             RenderSettings.fogDensity = Mathf.Lerp(baseDen, expDen, t);
             RenderSettings.ambientSkyColor = Color.Lerp(baseAmb, expAmb, t);
-
-            // Per-room-biome ground tint (expedition quads only; the meadow base keeps its authored material).
-            if (_ground == null)
-            {
-                var found = new System.Collections.Generic.List<MeshRenderer>();
-                foreach (var mr in Object.FindObjectsByType<MeshRenderer>(FindObjectsSortMode.None))
-                    if (mr.gameObject.name == "Ground_Arid") found.Add(mr);
-                if (found.Count > 0)
-                {
-                    _ground = found.ToArray();
-                    _mpb = new MaterialPropertyBlock();
-                    _groundCur = groundTarget; // snap on first sight — no lerp from black
-                }
-            }
-            if (_ground != null)
-            {
-                _groundCur = Color.Lerp(_groundCur, groundTarget, 1f - Mathf.Exp(-2.5f * UnityEngine.Time.deltaTime));
-                _mpb.SetColor(BaseColorId, _groundCur);
-                for (int i = 0; i < _ground.Length; i++)
-                    if (_ground[i] != null) _ground[i].SetPropertyBlock(_mpb);
-            }
         }
     }
 }