fix(setup): restore security stamp filtering

code/tests/test_setup_filters.py

@@ -0,0 +1,40 @@
+import pandas as pd
+
+from file_setup.setup_utils import filter_dataframe
+
+
+def _record(name: str, security_stamp: str) -> dict[str, object]:
+    return {
+        "name": name,
+        "faceName": name,
+        "edhrecRank": 100,
+        "colorIdentity": "G",
+        "colors": "G",
+        "manaCost": "{G}",
+        "manaValue": 1,
+        "type": "Creature",
+        "layout": "normal",
+        "text": "",
+        "power": "1",
+        "toughness": "1",
+        "keywords": "",
+        "side": "a",
+        "availability": "paper,arena",
+        "promoTypes": "",
+        "securityStamp": security_stamp,
+        "printings": "RNA",
+    }
+
+
+def test_filter_dataframe_removes_acorn_and_heart_security_stamps() -> None:
+    df = pd.DataFrame(
+        [
+            _record("Acorn Card", "Acorn"),
+            _record("Heart Card", "heart"),
+            _record("Legal Card", ""),
+        ]
+    )
+
+    filtered = filter_dataframe(df, banned_cards=[])
+
+    assert list(filtered["name"]) == ["Legal Card"]