DA doesn't update assistant cache

[tradej]

When the list of assistants is changed (pkg install $ASSISTANT, the ~/.devassistant folder is removed, etc.), the cache in the running server stays the same, so the client gets an information about installed assistants that's obsolete.

This should be solved by tweaking or disabling the caching, especially if the server is to stay running for a longer period of time.

NOTE: Tested in container where ~ was mounted from the host. Maybe it's related to that.