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/Animation/AC_EnemyTopDown.controller

@@ -316,7 +316,8 @@ AnimatorState:
   m_Name: Death
   m_Speed: 1
   m_CycleOffset: 0
-  m_Transitions: []
+  m_Transitions:
+  - {fileID: 8293450300144498373}
   m_StateMachineBehaviours: []
   m_Position: {x: 50, y: 50, z: 0}
   m_IKOnFeet: 0
@@ -508,6 +509,31 @@ AnimatorState:
   m_MirrorParameter: 
   m_CycleOffsetParameter: 
   m_TimeParameter: 
+--- !u!1101 &8293450300144498373
+AnimatorStateTransition:
+  m_ObjectHideFlags: 1
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: 
+  m_Conditions:
+  - m_ConditionMode: 2
+    m_ConditionEvent: IsDead
+    m_EventTreshold: 0
+  m_DstStateMachine: {fileID: 0}
+  m_DstState: {fileID: 8302574255206078140}
+  m_Solo: 0
+  m_Mute: 0
+  m_IsExit: 0
+  serializedVersion: 3
+  m_TransitionDuration: 0.25
+  m_TransitionOffset: 0
+  m_ExitTime: 0.9
+  m_HasExitTime: 0
+  m_HasFixedDuration: 1
+  m_InterruptionSource: 0
+  m_OrderedInterruption: 1
+  m_CanTransitionToSelf: 1
 --- !u!1102 &8302574255206078140
 AnimatorState:
   serializedVersion: 6