[FR] Resume partial conversations

I often find myself wanting to modify some recent prompt while maintaining most of the previous conversation. (e.g. I have asked for a list of 10 ideas, then I ask for an elaboration on one of the ideas and decide that it is not to my liking and want to ask about the other idea without keeping the other response in context). One way this maybe could be implemented would be to add an additional two properties to the logged LLM chats. The first would just be an additional conversation specific id key (since currently all conversations have the same key) and the second would be a backwards link to the previous completions/prompts. That way you could resume a chat from any arbitrary points just by calling llm -c -cid xxxxxxx -qid xxxxxx.

Start by tracing the existing logged LLM chats and the llm -c -cid xxxxxxx -qid xxxxxx entry point. Define how conversation IDs and backwards links should work for existing and new chats, then verify that a prompt can resume from any arbitrary prior point without retaining later responses.