refactor: drop unused VFX scaffolding, single-line English doc, reduce debug logs

- Remove unused chain/ParticleTrail and chain/VolumeCurve (dead since the EntityEffect
  pivot replaced the per-particle emit path) plus their test suites.
- Drop Vec3.lerp (only consumer was ParticleTrail).
- Strip step-by-step "[N/9]" debug logs from the orchestrator and per-entity logs
  from HytaleEntitySource / HytalePlayerRayCaster / ChainDamageApplier; keep one
  summary log per click and warnings on failure.
- Extract resolveChain and tryEmitVfx helpers in ChainLightningSceptreInteraction
  so firstRun reads top-down (cooldown gate -> resolve -> damage -> vfx -> deduct).
- Translate every Java doc/comment to single-line English.

Tests: 30/30 green (29 baseline kept + 1 chain damage adapter test).
Build: ./gradlew shadowJar clean.

src/main/java/com/mythlane/chainlightning/sceptre/HytaleEntityAdapter.java

@@ -13,16 +13,7 @@ import com.mythlane.chainlightning.chain.Vec3;
 
 import javax.annotation.Nonnull;
 
-/**
- * Adapter immuable Ref<EntityStore> -> ChainEntity (Phase 2 SAM).
- *
- * <p>Snapshot eager : la position et l'etat alive sont lus AU MOMENT de la creation.
- * La resolution BFS de ChainResolver lit ces valeurs figees -- robuste face a un mob
- * qui bouge ou meurt pendant la resolution.
- *
- * <p>Si TransformComponent est null (entite hors monde), l'adapter retourne un snapshot
- * "mort" (alive=false, position=Vec3.ZERO) qui sera filtre par ChainResolver.
- */
+/** Immutable Ref&lt;EntityStore&gt; -&gt; ChainEntity adapter; eager snapshot keeps BFS robust to mid-tick entity changes. */
 public final class HytaleEntityAdapter implements ChainEntity {
 
     private final Ref<EntityStore> ref;
@@ -37,23 +28,13 @@ public final class HytaleEntityAdapter implements ChainEntity {
         this.alive = alive;
     }
 
-    /**
-     * Constructeur package-private pour les tests : permet de construire un adapter
-     * sans passer par snapshot() (qui initialise TransformComponent.getComponentType()
-     * et donc le runtime Hytale complet).
-     */
+    /** Test-only factory that bypasses Hytale TransformComponent initialization. */
     static HytaleEntityAdapter forTest(@Nonnull Ref<EntityStore> ref, @Nonnull String id,
                                        @Nonnull Vec3 position, boolean alive) {
         return new HytaleEntityAdapter(ref, id, position, alive);
     }
 
-    /**
-     * Projette un Ref&lt;EntityStore&gt; vers un ChainEntity en lisant TransformComponent + EntityStatMap.
-     *
-     * @param ref      reference entite Hytale
-     * @param accessor ComponentAccessor (CommandBuffer implemente ComponentAccessor)
-     * @return adapter snapshot. Jamais null.
-     */
+    /** Reads TransformComponent + EntityStatMap once and freezes the result for the chain resolver. */
     @Nonnull
     public static HytaleEntityAdapter snapshot(@Nonnull Ref<EntityStore> ref,
                                                @Nonnull ComponentAccessor<EntityStore> accessor) {
@@ -73,24 +54,13 @@ public final class HytaleEntityAdapter implements ChainEntity {
         return new HytaleEntityAdapter(ref, id, vec, alive);
     }
 
-    /** Reference Hytale sous-jacente, exposee pour DamageSystems.executeDamage. */
+    /** Underlying Hytale ref, exposed so DamageSystems and EffectControllerComponent can address the entity. */
     @Nonnull
     public Ref<EntityStore> ref() {
         return ref;
     }
 
-    @Override
-    public String id() {
-        return id;
-    }
-
-    @Override
-    public Vec3 position() {
-        return position;
-    }
-
-    @Override
-    public boolean isAlive() {
-        return alive;
-    }
+    @Override public String id() { return id; }
+    @Override public Vec3 position() { return position; }
+    @Override public boolean isAlive() { return alive; }
 }