Wire node memory and shard slot capabilities

tests/test_tracker_routing.py

@@ -845,6 +845,25 @@ def test_tracker_registration_rejects_invalid_payload():
         tracker.stop()
 
 
+def test_tracker_registration_rejects_invalid_max_loaded_shards():
+    tracker = TrackerServer()
+    tracker_port = tracker.start()
+    try:
+        try:
+            _post_json(
+                f"http://127.0.0.1:{tracker_port}/v1/nodes/register",
+                {"endpoint": "http://127.0.0.1:9001", "shard_start": 0, "shard_end": 31,
+                 "max_loaded_shards": 0, "hardware_profile": {}, "score": 1.0},
+            )
+            raise AssertionError("Expected 400 for invalid max_loaded_shards")
+        except urllib.error.HTTPError as exc:
+            assert exc.code == 400
+            body = json.loads(exc.read())
+            assert "capability values" in body["error"]
+    finally:
+        tracker.stop()
+
+
 def test_tracker_routes_only_nodes_for_requested_model():
     """A node registered for one model cannot satisfy another model's route."""
     tracker = TrackerServer(model_presets={