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_ual.gd

@@ -0,0 +1,34 @@
+# Probes the UAL1 GLB loaded at runtime: animation names + sample track paths.
+extends SceneTree
+
+const UAL1 := "C:/Users/CAN/tinqs-ltd/ariki-game/assets/quaternius/anim-lib-1/Universal Animation Library[Standard]/Unreal-Godot/UAL1_Standard.glb"
+
+func _init() -> void:
+	var doc := GLTFDocument.new()
+	var state := GLTFState.new()
+	if doc.append_from_file(UAL1, state) != OK:
+		push_error("UAL load failed")
+		quit(1)
+		return
+	var scene := doc.generate_scene(state)
+	var player: AnimationPlayer = null
+	var stack: Array = [scene]
+	while not stack.is_empty():
+		var n: Node = stack.pop_back()
+		print("node: ", n.get_class(), "  '", n.name, "'")
+		if n is AnimationPlayer and player == null:
+			player = n
+		for c in n.get_children():
+			stack.push_back(c)
+	if player == null:
+		print("NO AnimationPlayer")
+		quit(1)
+		return
+	var names := player.get_animation_list()
+	print("clip count: ", names.size())
+	print("clips: ", ", ".join(names.slice(0, 40)))
+	var a := player.get_animation(names[0])
+	print("first clip '", names[0], "' tracks: ", a.get_track_count())
+	for i in mini(4, a.get_track_count()):
+		print("  track path: ", a.track_get_path(i))
+	quit()