Feature Request: Show more details about the source of the context and the size #883

I've found that in order to get the best results, managing context seems to be the key. Right now opencode shows you how much of the context window is full which is helpful, but I would love to see where the tokens in the context originated from to help inform my prompting. Anything from a high level "what tools were used to gather this context" to a "these tokens came from foobar.txt" would be helpful.