feat: Add Segmented Ribcage to skulls

This skull is unique for requiring a specific torso style, and for
adding additional limb slots.

bonemarketsolver/data/skulls.py

@@ -124,6 +124,16 @@ class Skull(Enum):
             menace = 1
             )
 
+    # Requires Torso Style 110
+    SEGMENTED_RIBCAGE = Action(
+            'Affix a Segmented Ribcage as the "skull"',
+            cost = Cost.ACTION.value + Cost.SEGMENTED_RIBCAGE.value,
+            value = 250,
+            skulls_needed = -1,
+            limbs_needed = 4,
+            segments = 1
+            )
+
     STYGIAN_IVORY = Action(
             "Use a Carved Ball of Stygian Ivory to cap off your (Skeleton Type)",
             cost = Cost.ACTION.value + Cost.STYGIAN_IVORY.value,

bonemarketsolver/solve.py

@@ -445,6 +445,12 @@ def Solve(shadowy_level, bone_market_fluctuations = None, zoological_mania = Non
             .OnlyEnforceIf(actions[Declaration.CURATOR])
 
 
+    # Skull requirements
+
+    model.Add(torso_style == 110) \
+            .OnlyEnforceIf(model.BoolExpression(actions[Skull.SEGMENTED_RIBCAGE] > 0))
+
+
     # Declaration requirements
 
     model.AddIf(actions[Declaration.HUMANOID],