feat(D-01/E): quickwins — debug toggle, HumanChairHelper move, collar equip

Q1: Remove F9 debug toggle from GltfAnimationApplier + delete dead
    GltfRenderLayer + remove keybind registration

Q2: Move HumanChairHelper from state/ to util/ — pure utility with
    no state dependency. 7 import updates.

Q3: Wire NECK collar equip flow in DataDrivenBondageItem:
    - Target must be tied up (V1 rule preserved)
    - Distance + line-of-sight validation
    - Owner added to NBT before equip via CollarHelper.addOwner()
    - V2EquipmentHelper handles conflict resolution
    - ModSounds.COLLAR_PUT played on success
    - OwnershipComponent.onEquipped registers in CollarRegistry

src/main/java/com/tiedup/remake/client/gltf/GltfClientSetup.java

@@ -1,11 +1,9 @@
 package com.tiedup.remake.client.gltf;
 
-import com.mojang.blaze3d.platform.InputConstants;
 import com.tiedup.remake.client.animation.context.ContextAnimationFactory;
 import com.tiedup.remake.client.animation.context.ContextGlbRegistry;
 import com.tiedup.remake.v2.bondage.client.V2BondageRenderLayer;
 import com.tiedup.remake.v2.bondage.datadriven.DataDrivenItemReloadListener;
-import net.minecraft.client.KeyMapping;
 import net.minecraft.client.renderer.entity.player.PlayerRenderer;
 import net.minecraft.server.packs.resources.ResourceManager;
 import net.minecraft.server.packs.resources.SimplePreparableReloadListener;
@@ -13,8 +11,6 @@ import net.minecraft.util.profiling.ProfilerFiller;
 import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.client.event.EntityRenderersEvent;
 import net.minecraftforge.client.event.RegisterClientReloadListenersEvent;
-import net.minecraftforge.client.event.RegisterKeyMappingsEvent;
-import net.minecraftforge.event.TickEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.fml.event.lifecycle.FMLClientSetupEvent;
@@ -23,24 +19,16 @@ import org.apache.logging.log4j.Logger;
 
 /**
  * Forge event registration for the glTF pipeline.
- * Registers keybind (F9), render layers, and animation factory.
+ * Registers render layers and animation factory.
  */
 public final class GltfClientSetup {
 
     private static final Logger LOGGER = LogManager.getLogger("GltfPipeline");
 
-    private static final String KEY_CATEGORY = "key.categories.tiedup";
-    static final KeyMapping TOGGLE_KEY = new KeyMapping(
-        "key.tiedup.gltf_toggle",
-        InputConstants.Type.KEYSYM,
-        InputConstants.KEY_F9,
-        KEY_CATEGORY
-    );
-
     private GltfClientSetup() {}
 
     /**
-     * MOD bus event subscribers (FMLClientSetupEvent, RegisterKeyMappings, AddLayers).
+     * MOD bus event subscribers (FMLClientSetupEvent, AddLayers).
      */
     @Mod.EventBusSubscriber(
         modid = "tiedup",
@@ -58,21 +46,11 @@ public final class GltfClientSetup {
             });
         }
 
-        @SubscribeEvent
-        public static void onRegisterKeybindings(
-            RegisterKeyMappingsEvent event
-        ) {
-            event.register(TOGGLE_KEY);
-            LOGGER.info("[GltfPipeline] Keybind registered: F9");
-        }
-
         @SuppressWarnings("unchecked")
         @SubscribeEvent
         public static void onAddLayers(EntityRenderersEvent.AddLayers event) {
-            // Add GltfRenderLayer (prototype/debug with F9 toggle) to player renderers
             var defaultRenderer = event.getSkin("default");
             if (defaultRenderer instanceof PlayerRenderer playerRenderer) {
-                playerRenderer.addLayer(new GltfRenderLayer(playerRenderer));
                 playerRenderer.addLayer(
                     new V2BondageRenderLayer<>(playerRenderer)
                 );
@@ -81,10 +59,9 @@ public final class GltfClientSetup {
                 );
             }
 
-            // Add both layers to slim player renderer (Alex)
+            // Add V2 layer to slim player renderer (Alex)
             var slimRenderer = event.getSkin("slim");
             if (slimRenderer instanceof PlayerRenderer playerRenderer) {
-                playerRenderer.addLayer(new GltfRenderLayer(playerRenderer));
                 playerRenderer.addLayer(
                     new V2BondageRenderLayer<>(playerRenderer)
                 );
@@ -143,23 +120,4 @@ public final class GltfClientSetup {
         }
     }
 
-    /**
-     * FORGE bus event subscribers (ClientTickEvent for keybind toggle).
-     */
-    @Mod.EventBusSubscriber(
-        modid = "tiedup",
-        bus = Mod.EventBusSubscriber.Bus.FORGE,
-        value = Dist.CLIENT
-    )
-    public static class ForgeBusEvents {
-
-        @SubscribeEvent
-        public static void onClientTick(TickEvent.ClientTickEvent event) {
-            if (event.phase != TickEvent.Phase.END) return;
-
-            while (TOGGLE_KEY.consumeClick()) {
-                GltfAnimationApplier.toggle();
-            }
-        }
-    }
 }