[Ralph Orchestrator] TUI - Write/Copy Iteration buffers to disk on demand

### Use case I want to be able to export the TUI output to an artifact for: - sharing - comparison / evaluation The output in the iteration buffers looks very informative and valuable from a record of how ralph progressed through the tasks of each iteration. I was pretty dismayed when I tried the ralph orchestrator for the first time, and found that the TUI output isn't captured to any files within the .ralph directory, nor is there an options to save the output to file from the interface, and more shockingly the TUI lacked the ability to select and copy text directly from the window. I wanted to share the output with the team as talking point during our knowledge/experience sharing sync on AI tools. I had to resort to screenshots but I really wanted to be able to provide the entire output as a log file. I'm particularly interested in having a full export of the output for evaluation purposes so that I can do some evaluations of how ralph perform given tweaks to the task prompt as