add lobotomize command

vibe_bot/database.py

@@ -138,13 +138,17 @@ class ChatDatabase:
 
     def _calculate_similarity(self, vec1: np.ndarray, vec2: np.ndarray) -> float:
         """Calculate cosine similarity between two vectors."""
+        vec1 = vec1.flatten()
+        vec2 = vec2.flatten()
         logger.debug(
             "Calculating cosine similarity between vectors of dimension %d",
             len(vec1),
         )
-        result = float(
-            np.dot(vec1, vec2) / (np.linalg.norm(vec1) * np.linalg.norm(vec2)),
-        )
+        norm1 = np.linalg.norm(vec1)
+        norm2 = np.linalg.norm(vec2)
+        if norm1 == 0 or norm2 == 0:
+            return 0.0
+        result = float(np.dot(vec1, vec2) / (norm1 * norm2))
         logger.debug("Similarity calculated: %.4f", result)
         return result