feat: add tiered durable state and memory bounds

tests/test_modelscope_discovery.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import sys
 import unittest
 from pathlib import Path
+from unittest.mock import patch
 
 
 PACKAGE_DIR = Path(__file__).resolve().parents[1] / "modelhub_submmit_api"
@@ -68,6 +69,17 @@ class ModelScopeDiscoveryTests(unittest.TestCase):
         self.assertEqual(1786294389, int(first.timestamp()))  # type: ignore[union-attr]
         self.assertEqual(1, metadata_client.calls)
 
+    def test_model_detail_cache_evicts_old_entries_at_fixed_limit(self) -> None:
+        metadata_client = ModelMetadataClient()
+        with patch.dict("os.environ", {"MODELSCOPE_DETAIL_CACHE_MAX_MODELS": "32"}):
+            discovery = HuggingFaceDiscovery(legacy_http_client=metadata_client)  # type: ignore[arg-type]
+        for index in range(40):
+            discovery.get_model_last_modified(f"owner/model-{index}")
+
+        self.assertEqual(32, len(discovery._model_last_modified_cache))
+        discovery.get_model_last_modified("owner/model-0")
+        self.assertEqual(41, metadata_client.calls)
+
     def test_openapi_page_size_never_exceeds_platform_limit(self) -> None:
         http_client = RecordingHttpClient()
         discovery = HuggingFaceDiscovery(http_client=http_client)  # type: ignore[arg-type]