Add extending by binding

playbill/binding.yaml

@@ -1,4 +1,5 @@
 $binding: playbill
+extends: ../extend-me/binding.yaml
 id: the-great-spires
 name: The Great Spires
 author: "Endeavorance <hello@endeavorance.camp>"

playbill/spires/methods/gourmond.yaml

@@ -11,8 +11,7 @@ $define: ability
 id: identify-poison
 name: Identify Poison
 type: action
-costs:
-  ap: 1
+ap: 1
 roll: focus
 boons:
   - You know the antidote to the detected poison