Tattoo test bed: Quaternius v3-v6 bakes + Lena pipeline (bake, de-mirror, re-UV, viewers)

Session 2026-07-23/24 additions on top of the existing Quaternius bed:
- bake_lena.gd: 6-piece bake on QuatSkin Lena (chiefs-mark/iron-spine arms,
  voyagers/storm-bearer legs, star-eye chest, hearth-warmth back); global-axis
  wrap frame + 3cm junction blend kill the elbow split line
- demirror_lena.gd: tri-level split of mirror-shared limb UVs (arms 100%->0%,
  legs 99%->5% crotch-only residual)
- reuv_lena.gd: Quaternius-style semantic re-UV (16 islands, cylinder limbs +
  cylinder head/torso with planar caps) + texture transfer; fixes armpit/chin/
  cheek planar smears; single 4096 atlas, per-side tattoos native
- main_lena / anim_lena viewers (18 UAL clips, U light toggle) + probes + shots

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

probe_lena.gd

@@ -0,0 +1,64 @@
+# Probe the QuatSkin Lena GLB: skeleton bones, meshes, UV/weight arrays, textures.
+# Run: tinqs.console.exe --headless --path tattoo-test -s res://probe_lena.gd
+extends SceneTree
+
+const GLB_PATH := "C:/Users/CAN/tinqs-ltd/ariki-game/assets/quaternius/derived-bodies/Ariki_Female_QuatSkin.glb"
+
+func _init() -> void:
+	var doc := GLTFDocument.new()
+	var state := GLTFState.new()
+	if doc.append_from_file(GLB_PATH, state) != OK:
+		push_error("GLB load failed")
+		quit(1)
+		return
+	var scene := doc.generate_scene(state)
+
+	var skel: Skeleton3D = null
+	var stack: Array = [scene]
+	while not stack.is_empty():
+		var n: Node = stack.pop_back()
+		if n is Skeleton3D and skel == null:
+			skel = n
+		if n is MeshInstance3D or n.get_class() == "ImporterMeshInstance3D":
+			var mesh = n.mesh
+			if mesh is ImporterMesh:
+				mesh = mesh.get_mesh()
+			print("MESH node=", n.name, " surfaces=", mesh.get_surface_count())
+			for s in mesh.get_surface_count():
+				var arrays: Array = mesh.surface_get_arrays(s)
+				var v: PackedVector3Array = arrays[Mesh.ARRAY_VERTEX]
+				var uv = arrays[Mesh.ARRAY_TEX_UV]
+				var bones = arrays[Mesh.ARRAY_BONES]
+				var nrm = arrays[Mesh.ARRAY_NORMAL]
+				var mat: Material = mesh.surface_get_material(s)
+				var matname: String = mat.resource_name if mat else "none"
+				var texinfo := "no-tex"
+				if mat is BaseMaterial3D and mat.albedo_texture:
+					var img: Image = mat.albedo_texture.get_image()
+					texinfo = "%dx%d" % [img.get_width(), img.get_height()]
+				print("  surf %d: verts=%d uv=%s normals=%s bones=%s mat=%s tex=%s" % [
+					s, v.size(),
+					"yes" if uv != null else "NO",
+					"yes" if nrm != null else "NO",
+					str(bones.size() / v.size()) + "x" if bones != null and v.size() > 0 else "NO",
+					matname, texinfo])
+			if n.get("skin") != null and n.skin != null:
+				print("  skin binds=", n.skin.get_bind_count())
+		for c in n.get_children():
+			stack.push_back(c)
+
+	if skel:
+		print("SKELETON bones=", skel.get_bone_count())
+		var names := []
+		for i in skel.get_bone_count():
+			names.append(skel.get_bone_name(i))
+		print("  names: ", ", ".join(names))
+		for bn in ["upperarm_r", "lowerarm_r", "hand_r", "spine_03", "clavicle_r"]:
+			var idx := skel.find_bone(bn)
+			if idx >= 0:
+				print("  %s idx=%d pos=%s" % [bn, idx, skel.get_bone_global_rest(idx).origin])
+			else:
+				print("  %s NOT FOUND" % bn)
+	else:
+		print("NO SKELETON")
+	quit()