refactor(anim): direccions cardinals (north/south/east) en YAML i codi

data/entities/mummy/mummy.yaml

@@ -23,18 +23,18 @@ flags:
   collides: true
   interactable: false
 # Strip de 12 frames en graella 4×3 (mateix esquema que el jugador):
-#   0..3  → walk_down  (cara avall)
-#   4..7  → walk_up    (cara amunt)
-#   8..11 → walk       (lateral; flip horitzontal segons el sentit)
+#   0..3  → walk_south  (cara avall)
+#   4..7  → walk_north  (cara amunt)
+#   8..11 → walk_east   (lateral; flip horitzontal segons el sentit)
 # La momia no té variants `stand_*` perquè mai no para.
 animations:
-  walk_down: { frames: [0, 1, 2, 3],  fps: 8, loop: true }
-  walk_up:   { frames: [4, 5, 6, 7],  fps: 8, loop: true }
-  walk:      { frames: [8, 9, 10, 11], fps: 8, loop: true }
+  walk_south: { frames: [0, 1, 2, 3],   fps: 8, loop: true }
+  walk_north: { frames: [4, 5, 6, 7],   fps: 8, loop: true }
+  walk_east:  { frames: [8, 9, 10, 11], fps: 8, loop: true }
 ai:
   type: corridor_wanderer
   direction_choice: random
-  initial_direction: right
+  initial_direction: east
 stats:
   speed: 30
   damage: 1