reordered Pope cards in Earthman deck; addressed two pipeline errors concerning card deck via setUp helper

src/apps/epic/migrations/0016_reorder_earthman_popes.py

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+"""
+Data migration: reorder the five Pope cards.
+
+New assignment (card number → title):
+  1 → Chancellor  2 → President  3 → Tsar  4 → Chairman  5 → Emperor
+"""
+from django.db import migrations
+
+
+POPE_RENAMES = {
+    1: ("Pope 1: Chancellor", "pope-1-chancellor"),
+    2: ("Pope 2: President",  "pope-2-president"),
+    3: ("Pope 3: Tsar",       "pope-3-tsar"),
+    4: ("Pope 4: Chairman",   "pope-4-chairman"),
+    5: ("Pope 5: Emperor",    "pope-5-emperor"),
+}
+
+POPE_ORIGINALS = {
+    1: ("Pope 1: President",  "pope-1-president"),
+    2: ("Pope 2: Tsar",       "pope-2-tsar"),
+    3: ("Pope 3: Chairman",   "pope-3-chairman"),
+    4: ("Pope 4: Emperor",    "pope-4-emperor"),
+    5: ("Pope 5: Chancellor", "pope-5-chancellor"),
+}
+
+
+def rename_forward(apps, schema_editor):
+    TarotCard   = apps.get_model("epic", "TarotCard")
+    DeckVariant = apps.get_model("epic", "DeckVariant")
+
+    earthman = DeckVariant.objects.filter(slug="earthman").first()
+    if not earthman:
+        return
+
+    for number, (new_name, new_slug) in POPE_RENAMES.items():
+        TarotCard.objects.filter(
+            deck_variant=earthman, arcana="MAJOR", number=number
+        ).update(name=new_name, slug=new_slug)
+
+
+def rename_reverse(apps, schema_editor):
+    TarotCard   = apps.get_model("epic", "TarotCard")
+    DeckVariant = apps.get_model("epic", "DeckVariant")
+
+    earthman = DeckVariant.objects.filter(slug="earthman").first()
+    if not earthman:
+        return
+
+    for number, (old_name, old_slug) in POPE_ORIGINALS.items():
+        TarotCard.objects.filter(
+            deck_variant=earthman, arcana="MAJOR", number=number
+        ).update(name=old_name, slug=old_slug)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("epic", "0015_rename_classical_element_earth_to_stone"),
+    ]
+
+    operations = [
+        migrations.RunPython(rename_forward, reverse_code=rename_reverse),
+    ]