deck contribution sprint 1: TableSeat.deck_variant FK + select_role wiring — TDD

- epic.TableSeat gains deck_variant FK → DeckVariant (nullable, SET_NULL)
- select_role view assigns request.user.equipped_deck to seat on role confirmation
- Migration 0006_add_deck_variant_to_tableseat
- ITs: test_select_role_assigns_equipped_deck_to_seat,
       test_select_role_no_deck_leaves_deck_variant_null

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/epic/migrations/0006_add_deck_variant_to_tableseat.py

@@ -0,0 +1,19 @@
+# Generated by Django 6.0 on 2026-04-28 02:35
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('epic', '0005_seed_astro_reference_tables'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='tableseat',
+            name='deck_variant',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='active_seats', to='epic.deckvariant'),
+        ),
+    ]

src/apps/epic/models.py

@@ -185,6 +185,10 @@ class TableSeat(models.Model):
         "TarotCard", null=True, blank=True,
         on_delete=models.SET_NULL, related_name="significator_seats",
     )
+    deck_variant = models.ForeignKey(
+        "DeckVariant", null=True, blank=True,
+        on_delete=models.SET_NULL, related_name="active_seats",
+    )
 
 
 class DeckVariant(models.Model):

src/apps/epic/tests/integrated/test_views.py

@@ -680,6 +680,27 @@ class SelectRoleViewTest(TestCase):
             )
             mock_notify.assert_called_once_with(self.room.id)
 
+    def test_select_role_assigns_equipped_deck_to_seat(self):
+        earthman = DeckVariant.objects.get(slug="earthman")
+        self.founder.equipped_deck = earthman
+        self.founder.save(update_fields=["equipped_deck"])
+        self.client.post(
+            reverse("epic:select_role", kwargs={"room_id": self.room.id}),
+            data={"role": "PC"},
+        )
+        seat = TableSeat.objects.get(room=self.room, slot_number=1)
+        self.assertEqual(seat.deck_variant, earthman)
+
+    def test_select_role_no_deck_leaves_deck_variant_null(self):
+        self.founder.equipped_deck = None
+        self.founder.save(update_fields=["equipped_deck"])
+        self.client.post(
+            reverse("epic:select_role", kwargs={"room_id": self.room.id}),
+            data={"role": "PC"},
+        )
+        seat = TableSeat.objects.get(room=self.room, slot_number=1)
+        self.assertIsNone(seat.deck_variant)
+
     def test_select_role_requires_login(self):
         self.client.logout()
         response = self.client.post(

src/apps/epic/views.py

@@ -575,6 +575,7 @@ def select_role(request, room_id):
             if room.table_seats.filter(role=role).exists():
                 return HttpResponse(status=409)
             active_seat.role = role
+            active_seat.deck_variant = request.user.equipped_deck
             active_seat.save()
         record(room, GameEvent.ROLE_SELECTED, actor=request.user,
                role=role, slot_number=active_seat.slot_number,