Art/Fix: A0 gate pass — death-pose lock, off-palette drift, lighting debris

Found by running the A0 style-proof against the SHIPPING scene instead of
ArtStaging (which judges static glTF bakes on an import shader, with zero
SkinnedMeshRenderers and no Animator — it cannot answer "does the game look
like this").

Player-facing bugs fixed:

- AC_PlayerTopDown/AC_EnemyTopDown "Death" had ZERO outgoing transitions.
  Any State enters on IsDead and nothing ever leaves. The player ghost is a
  persistent entity, so its Rukhanka animator never resets: once you died you
  rendered sprawled on the seabed permanently — sim fully respawned, moving and
  fighting, visually a corpse. Added Death -> Idle on (IsDead == false).

- AmbientMotionSystem drift was still the deleted biome system: key 0 =
  "meadow", MeadowMoteColor (0.62, 0.85, 0.60) = GREEN motes, 600 of them in a
  36x7x24 box following the camera — the most off-palette thing in the frame.
  Its x>500 region probe pointed at space now holding zero renderers. Collapsed
  to one cold marine particulate; dropped the 4 dead mote colours + AridWind.

- FeedbackFx.MakeParticleMaterial built Sprites/Default with NO texture, so
  every procedural particle rendered as a hard SQUARE. Added a procedural soft
  dot (no Resources.Load — build-stripped; asset-free presentation is the rule).

- Game.unity carried a stock Unity "Directional Light" (warm-WHITE, 1.05, Soft)
  outranking KeyWarm as a second competing shadow caster, plus 6 orphaned
  LandmarkLights — four at x=1030/1530 lighting a kilometre of empty water, two
  with no renderer within 12u, two of them purple. All 7 deleted. Added RimCold
  for silhouette separation; key:fill set to the tuned 3.9:1; WarmPool -> Soft.

ArtStaging (kept as a lighting lab): KeyWarm 0.15 -> 0.85 — it was the only
shadow-caster yet sat BELOW GloamFill 0.22, which destroys form by definition
and is what read as "flat". StagingAmbiance was attached to nothing and its
flora wiring searched for a Game.unity parent, which is what read as "static";
it also force-played the combat one-shot pool, now restricted to looping
emitters. Flicker raised to a measured x2.11 cold swing vs x1.03 warm.

304/304 EditMode green; death-recovery, palette and particulate all verified
live in Game.unity Play.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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

@@ -16,15 +16,12 @@ namespace ProjectM.Client
         [Header("Master")]
         public bool Enabled = true;
 
-        [Header("Biome drift particles (emitter follows the camera; sim space stays world)")]
+        [Header("Ambient drift particles (emitter follows the camera; sim space stays world)")]
+        // 2026-08-07: the four per-biome mote colours + AridWind went with the expedition — LANTERN is one look,
+        // so the colour is fixed cold in AmbientMotionSystem. Only rate and size stay tunable.
         public bool DriftEnabled = true;
-        [Min(0f)] public float DriftRate = 28f;
-        [Min(0.01f)] public float DriftSize = 0.09f;
-        public Color MeadowMoteColor = new Color(0.62f, 0.85f, 0.60f, 0.35f);
-        public Color AridDustColor = new Color(0.85f, 0.68f, 0.45f, 0.28f);
-        public Color CavernMoteColor = new Color(0.55f, 0.65f, 0.95f, 0.33f);
-        public Color BlightSporeColor = new Color(0.72f, 0.50f, 0.85f, 0.33f);
-        public Vector3 AridWind = new Vector3(2.2f, -0.15f, 0.5f);
+        [Min(0f)] public float DriftRate = 18f;
+        [Min(0.01f)] public float DriftSize = 0.07f;
 
         [Header("Idle foliage sway (root tilt) — OFF by default since 1.5b: ALL Synty flora uses the Synty/Foliage")]
         [Header("VERTEX-wind shader, so root tilt double-animates. Keep for A/B; rustle below stays the reactive layer.")]