Polish V2 subsystem: lockpick kinds, package boundaries, client extractions

Architectural debt cleanup on top of the earlier V2 hardening pass.

Minigame:
  - LockpickMiniGameState splits the overloaded targetSlot int into a
    LockpickTargetKind enum + targetData int. Body-vs-furniture
    dispatch is now a simple enum check; the NBT-tag nonce it
    previously depended on is gone, along with the AIOOBE risk at
    BodyRegionV2.values()[targetSlot].
  - PacketLockpickAttempt.handleFurnitureLockpickSuccess takes the
    entity and seat id as explicit parameters. Caller pre-validates
    both before any side effect, so a corrupted ctx tag can no longer
    produce a "Lock picked!" UI with a used lockpick and nothing
    unlocked.

Package boundaries:
  - client.gltf no longer imports v2.bondage. Render-layer attachment,
    DataDrivenItemReloadListener, and GlbValidationReloadListener all
    live in v2.client.V2ClientSetup.
  - GlbValidationReloadListener moved to v2.bondage.client.diagnostic.
  - Reload-listener ordering is preserved via EventPriority (HIGH for
    the generic GLB cache clear in GltfClientSetup, LOW for bondage
    consumers in V2ClientSetup).
  - Removed the unused validateAgainstDefinition stub on GlbValidator.

Extractions from EntityFurniture:
  - FurnitureSeatSyncCodec (pipe/semicolon serialization for the
    SEAT_ASSIGNMENTS_SYNC entity data field), with 8 unit tests.
  - FurnitureClientAnimator (client-only seat-pose kickoff, moved out
    of the dual-side entity class).
  - EntityFurniture drops ~100 lines with no behavior change.

Interface docs:
  - ISeatProvider Javadoc narrowed to reflect that EntityFurniture is
    the only implementation; callers that need animation state or
    definition reference still downcast.
  - FurnitureAuthPredicate.findOccupant uses the interface only.
  - AnimationIdBuilder flagged as legacy JSON-era utility (NPC
    fallback + MCA mixin).

Artist guide: corrected the "Monster Seat System (Planned)" section
to match the ISeatProvider single-impl reality.

src/main/java/com/tiedup/remake/client/animation/util/AnimationIdBuilder.java

@@ -6,26 +6,24 @@ import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.api.distmarker.OnlyIn;
 
 /**
- * Utility class for building animation ResourceLocation IDs.
+ * Builds legacy JSON-animation ResourceLocation IDs from pose / bind-mode
+ * / variant components.
  *
- * <p>Centralizes the logic for constructing animation file names.
- * Used by BondageAnimationManager, NpcAnimationTickHandler, and AnimationTickHandler.
- *
- * <p>Animation naming convention:
- * <pre>
- * {poseType}_{bindMode}_{variant}.json
- *
- * poseType: tied_up_basic | straitjacket | wrap | latex_sack
- * bindMode: (empty for FULL) | _arms | _legs
- * variant: _idle | _struggle | (empty for static)
- * </pre>
- *
- * <p>Examples:
+ * <p><b>Legacy path.</b> The V2 player pipeline resolves animations from
+ * GLB models via {@code GltfAnimationApplier.applyV2Animation} +
+ * {@code RegionBoneMapper} and does not touch this class. Only two
+ * callers remain:</p>
  * <ul>
- *   <li>tiedup:tied_up_basic_idle - STANDARD + FULL + idle</li>
- *   <li>tiedup:straitjacket_arms_struggle - STRAITJACKET + ARMS + struggle</li>
- *   <li>tiedup:wrap_idle - WRAP + FULL + idle</li>
+ *   <li>{@code NpcAnimationTickHandler} — JSON fallback when a tied
+ *       NPC has no GLB-bearing item equipped.</li>
+ *   <li>{@code MixinVillagerEntityBaseModelMCA} — MCA villagers use
+ *       their own capability system and don't flow through the V2
+ *       item registry, so they stay on the JSON animation path.</li>
  * </ul>
+ *
+ * <p>New code should not depend on this class. Animation naming:
+ * {@code {poseType}_{bindMode}_{variant}} (e.g.
+ * {@code tiedup:straitjacket_arms_struggle}).</p>
  */
 @OnlyIn(Dist.CLIENT)
 public final class AnimationIdBuilder {