Fix entry point handling for Infinity/NaN data values to prevent SVS Crash (#174)

Ensure the entry point ID is correctly handled when it contains Infinity
or NaN values. This change prevents SVS from crashing in such cases by
adding proper checks and handling logic.

Author: ibhati

include/svs/core/medioid.h

@@ -340,6 +340,11 @@ size_t find_medioid(
             global_min = neighbor;
         }
     });
+
+    if (global_min.id() >= data.size()) {
+        global_min = Neighbor<size_t>(0, global_min.distance());
+    }
+
     return global_min.id();
 }