[FEAT] Add Research Tab #45
Description
We need to add a new tab to the TUI called "Research". This tab should be a dedicated session with the underlying backend (e.g. opencode, kiro-cli) where the human can have an independent chat conversation with the an agent. This is separate from the task being executed by a clawdmux team. This tab should be global, meaning its contents remains the same across all tasks. Thing of it as a global research session for that instance of clawdmux.