Add recurring Daily Slop Drop collaboration cycle

tests/test_daily_cycle.py

@@ -0,0 +1,20 @@
+import datetime as dt
+import unittest
+
+from scripts.open_daily_cycle import cycle_body, cycle_marker
+
+
+class DailyCycleTests(unittest.TestCase):
+    def test_marker_is_stable(self):
+        self.assertEqual(cycle_marker(dt.date(2026, 8, 7)), "[CYCLE 2026-08-07]")
+
+    def test_cycle_requires_video_and_both_agents(self):
+        body = cycle_body(dt.date(2026, 8, 7))
+        self.assertIn("Timmy pass", body)
+        self.assertIn("Vincent pass", body)
+        self.assertIn("MP4 walkthrough", body)
+        self.assertIn("No progress updates", body)
+
+
+if __name__ == "__main__":
+    unittest.main()