fix(animation): free bones only enabled for Full-prefixed animations

Previously, any GLB with keyframes on free bones would animate them,
even for standard animations like Idle. This caused accidental bone
hijacking — e.g., handcuffs freezing the player's head because the
artist keyframed all bones in Blender.

Now the Full prefix (FullIdle, FullStruggle, FullWalk) is enforced:
only Full-prefixed animations can animate free bones. Standard
animations (Idle, Struggle, Walk) only animate owned bones.

This aligns the code with the documented convention in ARTIST_GUIDE.md.

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

@@ -208,12 +208,14 @@ public final class GltfPoseConverter {
             }
         }
 
-        // Selective: enable owned parts always, free parts only if they have keyframes
+        // Selective: enable owned parts always, free parts only for "Full" animations
+        // that explicitly opt into full-body control.
         enableSelectiveParts(
             builder,
             ownedParts,
             enabledParts,
-            partsWithKeyframes
+            partsWithKeyframes,
+            animName
         );
 
         KeyframeAnimation anim = builder.build();
@@ -554,22 +556,35 @@ public final class GltfPoseConverter {
      *
      * <ul>
      *   <li>Owned parts: always enabled (the item controls these bones)</li>
-     *   <li>Free parts WITH keyframes: enabled (the GLB has animation data for them)</li>
+     *   <li>Free parts WITH keyframes AND "Full" animation: enabled (explicit opt-in to full-body)</li>
-     *   <li>Free parts WITHOUT keyframes: disabled (no data to animate, pass through to context)</li>
+     *   <li>Free parts without "Full" prefix: disabled (prevents accidental bone hijacking)</li>
      *   <li>Other items' parts: disabled (pass through to their own layer)</li>
      * </ul>
      *
+     * <p>The "Full" prefix convention (FullIdle, FullStruggle, FullWalk) is the artist's
+     * explicit declaration that this animation is designed to control the entire body,
+     * not just the item's owned regions. Without this prefix, free bones are never enabled,
+     * even if the GLB contains keyframes for them. This prevents accidental bone hijacking
+     * when an artist keyframes all bones in Blender by default.</p>
+     *
      * @param builder            the animation builder with keyframes already added
      * @param ownedParts         parts the item explicitly owns (always enabled)
      * @param enabledParts       parts the item may animate (owned + free)
      * @param partsWithKeyframes parts that received actual animation data from the GLB
+     * @param animName           resolved animation name (checked for "Full" prefix)
      */
     private static void enableSelectiveParts(
         KeyframeAnimation.AnimationBuilder builder,
         Set<String> ownedParts,
         Set<String> enabledParts,
-        Set<String> partsWithKeyframes
+        Set<String> partsWithKeyframes,
+        String animName
     ) {
+        // Free bones are only enabled for "Full" animations (FullIdle, FullStruggle, etc.)
+        // The "gltf_" prefix is added by convertClipSelective, so check for "gltf_Full"
+        boolean isFullBodyAnimation = animName != null &&
+            animName.startsWith("gltf_Full");
+
         String[] allParts = {
             "head",
             "body",
@@ -588,13 +603,16 @@ public final class GltfPoseConverter {
                     // Always enable owned parts — the item controls these bones
                     part.fullyEnablePart(false);
                 } else if (
+                    isFullBodyAnimation &&
                     enabledParts.contains(partName) &&
                     partsWithKeyframes.contains(partName)
                 ) {
-                    // Free part WITH keyframes: enable so the GLB animation drives it
+                    // Full-body animation: free part WITH keyframes — enable.
+                    // The "Full" prefix is the artist's explicit opt-in to animate
+                    // bones outside their declared regions.
                     part.fullyEnablePart(false);
                 } else {
-                    // Other item's part, or free part without keyframes: disable.
+                    // Non-Full animation, other item's part, or free part without keyframes.
                     // Disabled parts pass through to the lower-priority context layer.
                     part.setEnabled(false);
                 }