Embed RAG fetched command sequences into reponse

[corysabol]

The chat response should include a variable called COMMANDS: [] which is a list of the command sequences retrieved from the vector store.

This list may be empty, but the client expects it to be there.

{
  .. stuff ..,
  "data": {
    "variables": {
      .. other vars ..,
      "COMMANDS": []
    }
  }
}