chore: Various bug fixes (#1350)

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CONTRIBUTING.md

@@ -60,8 +60,8 @@ alembic upgrade head
 Now when you want to use `letta`, make sure you first activate the `poetry` environment using poetry shell:
 
 ```shell
-$ poetry shell
-(pyletta-py3.12) $ letta run
+$ eval $(poetry env activate)
+(letta-py3.12) $ letta run
 ```
 
 Alternatively, you can use `poetry run` (which will activate the `poetry` environment for the `letta run` command only):