fix(docs): use tools=[] in BaseMemory example (#772)

The automatic memory example referenced an undefined `tools` variable.
Since HindsightMemory handles retain/recall transparently, no tools
are needed — use an empty list.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

hindsight-docs/docs/sdks/integrations/llamaindex.md

@@ -37,7 +37,7 @@ async def main():
         mission="Track user preferences and project context",
     )
 
-    agent = ReActAgent(tools=tools, llm=OpenAI(model="gpt-4o"), memory=memory)
+    agent = ReActAgent(tools=[], llm=OpenAI(model="gpt-4o"), memory=memory)
     response = await agent.run("Remember that I prefer dark mode")
     print(response)