feat: reserve queue capacity for recent models

tests/test_poll_policy.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import argparse
+import sys
+import unittest
+from pathlib import Path
+
+
+PACKAGE_DIR = Path(__file__).resolve().parents[1] / "modelhub_submmit_api"
+if str(PACKAGE_DIR) in sys.path:
+    sys.path.remove(str(PACKAGE_DIR))
+sys.path.insert(0, str(PACKAGE_DIR))
+
+from poll_runner import resolve_age_cleanup_policy  # noqa: E402
+
+
+class PollPolicyTests(unittest.TestCase):
+    def test_age_cleanup_uses_eighty_once_then_ninety_five(self) -> None:
+        args = argparse.Namespace(
+            old_model_queue_threshold=80,
+            dynamic_old_model_cleanup_threshold=95,
+        )
+
+        self.assertEqual(
+            ("initial", 80),
+            resolve_age_cleanup_policy(args, initial_cleanup_pending=True),
+        )
+        self.assertEqual(
+            ("dynamic", 95),
+            resolve_age_cleanup_policy(args, initial_cleanup_pending=False),
+        )
+
+    def test_dynamic_cleanup_cannot_be_stricter_than_admission(self) -> None:
+        args = argparse.Namespace(
+            old_model_queue_threshold=80,
+            dynamic_old_model_cleanup_threshold=70,
+        )
+
+        self.assertEqual(
+            ("dynamic", 80),
+            resolve_age_cleanup_policy(args, initial_cleanup_pending=False),
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()