WIP: initial epic fight core extraction (Phase 0)

83 files forkés d'Epic Fight (~18k LOC). Base non-compilable en l'état.

Contenu extrait :
- math/ — OpenMatrix4f, Vec3f/4f/2f, QuaternionUtils, MathUtils, ...
- armature/ — Armature, Joint, JointTransform, HumanoidArmature
- anim/ — Animator, ServerAnimator, ClientAnimator, LivingMotion, ...
- anim/types/ — StaticAnimation, DynamicAnimation, MovementAnimation, LinkAnimation,
                ConcurrentLinkAnimation, LayerOffAnimation, EntityState
- anim/client/ — Layer, ClientAnimator, JointMask
- mesh/ — SkinnedMesh, SingleGroupVertexBuilder, Mesh, HumanoidMesh, ...
- cloth/ — AbstractSimulator, ClothSimulator (dépendance transitive de StaticMesh)
- asset/ — JsonAssetLoader, AssetAccessor
- patch/ — EntityPatch, LivingEntityPatch, PlayerPatch, ClientPlayerPatch
- util/ — ParseUtil, TypeFlexibleHashMap
- exception/ — AssetLoadingException
- event/ — PatchedRenderersEvent, PrepareModelEvent, RegisterResourceLayersEvent
- render/ — TiedUpRenderTypes

Headers GPLv3 + attribution injectés sur tous les .java.
Package declarations fixées sur Armature.java et TiedUpRenderTypes.java.

115 imports résiduels à résoudre manuellement :
- yesman.epicfight.main (EpicFightMod, EpicFightSharedConstants) — 30
- yesman.epicfight.gameasset (Animations, Armatures, EpicFightSounds) — 12
- yesman.epicfight.api.physics + physics.ik (combat physics) — 16
- yesman.epicfight.network.* (combat packets) — 13
- yesman.epicfight.world.* (combat entity logic) — 10
- yesman.epicfight.config.ClientConfig — 3
- yesman.epicfight.skill, .client.gui, .particle, .collider — divers combat/UI

Stratégie fix (2-3 sem manuel) : strip usage combat, stubs pour refs
core (EpicFightMod → TiedUpMod, SharedConstants → TiedUpRigConstants,
ClientConfig → TiedUpAnimationConfig).

src/main/java/com/tiedup/remake/rig/math/Vec4f.java

@@ -0,0 +1,75 @@
+/*
+ * Derived from Epic Fight (https://github.com/Epic-Fight/epicfight)
+ * by the Epic Fight Team, licensed under GPLv3.
+ * Modifications © 2026 TiedUp! Remake Contributors, distributed under GPLv3.
+ */
+
+package com.tiedup.remake.rig.math;
+
+public class Vec4f extends Vec3f {
+	public float w;
+	
+	public Vec4f() {
+		super();
+		this.w = 0;
+	}
+	
+	public Vec4f(float x, float y, float z, float w) {
+		super(x, y, z);
+		this.w = w;
+	}
+	
+	public Vec4f(Vec3f vec3f) {
+		super(vec3f.x, vec3f.y, vec3f.z);
+		this.w = 1.0F;
+	}
+	
+	public void set(float x, float y, float z, float w) {
+		this.x = x;
+		this.y = y;
+		this.z = z;
+		this.w = w;
+	}
+	
+	public void set(Vec4f vec4f) {
+		super.set(vec4f);
+		this.w = vec4f.w;
+	}
+	
+	public Vec4f add(float x, float y, float z, float w) {
+		this.x += x;
+		this.y += y;
+		this.z += z;
+		this.w += w;
+		return this;
+	}
+	
+	public static Vec4f add(Vec4f left, Vec4f right, Vec4f dest) {
+		if (dest == null) {
+			dest = new Vec4f();
+		}
+		
+		dest.x = left.x + right.x;
+		dest.y = left.y + right.y;
+		dest.z = left.z + right.z;
+		dest.w = left.w + right.w;
+		
+		return dest;
+	}
+	
+	@Override
+	public Vec4f scale(float f) {
+		super.scale(f);
+		this.w *= f;
+		return this;
+	}
+	
+	public Vec4f transform(OpenMatrix4f matrix) {
+		return OpenMatrix4f.transform(matrix, this, this);
+	}
+	
+	@Override
+	public String toString() {
+		return "Vec4f[" + this.x + ", " + this.y + ", " + this.z + ", " + this.w + "]";
+	}
+}