Fix knowledge base loader to handle list format embeddings

Handle both dict and list formats in load_knowledge_base function to fix AttributeError

bot/commands/knowledge.py

@@ -53,9 +53,24 @@ def load_knowledge_base(
     with open(file_path, "r") as f:
         data = json.load(f)
 
-    chunks = data.get("chunks", [])
-    embeddings = data.get("embeddings", [])
-    metadata = data.get("metadata", {})
+    # Handle both dict format {"chunks": [...], "embeddings": [...], "metadata": {...}}
+    # and legacy list format where data is just the chunks
+    if isinstance(data, dict):
+        chunks = data.get("chunks", [])
+        embeddings = data.get("embeddings", [])
+        metadata = data.get("metadata", {})
+    elif isinstance(data, list):
+        # Legacy format: assume it's just chunks, or list of [chunk, embedding] pairs
+        if data and isinstance(data[0], dict) and "text" in data[0]:
+            # Format: [{"text": "...", "embedding": [...]}, ...]
+            chunks = [item.get("text", "") for item in data]
+            embeddings = [item.get("embedding", []) for item in data]
+            metadata = {"format": "legacy_list_of_dicts"}
+        else:
+            # Unknown list format - can't process
+            return None
+    else:
+        return None
 
     # Add file_path to metadata for reference
     metadata["_file_path"] = file_path