落地无头规则引擎与局内内容，便于命令行复现对战。

规则、卡包与测试放在同一套核心里，避免表现层自行结算。

Co-authored-by: Cursor <cursoragent@cursor.com>

content/packs/pack.example.vitality.json

@@ -0,0 +1,10 @@
+{
+  "id": "pack.example.vitality",
+  "name": "Vitality",
+  "base": false,
+  "coreActions": ["Heal"],
+  "cards": ["card.example.salve"],
+  "allOf": [
+    { "kind": "HealReceivedAtLeast", "amount": 2 }
+  ]
+}