feat: implement should_recall in memory.py, all tests passing

memory.py

@@ -29,3 +29,21 @@ def apply_update(state: dict, raw_json: str) -> dict:
         if mem not in state["treasure"]:
             state["treasure"].append(mem)
     return state
+
+
+def should_recall(state: dict) -> tuple[bool, str | None]:
+    if state["affinity"] < 51:
+        return False, None
+
+    unclaimed = [m for m in state["treasure"] if m not in state["claimed"]]
+    if not unclaimed:
+        return False, None
+
+    last = state.get("last_recall_turn")
+    if last is None:
+        return True, unclaimed[0]
+
+    if state["turn"] - last >= 3:
+        return True, unclaimed[0]
+
+    return False, None