The plumbing exists: AgentRunHandle.output provides an AsyncIterable, the TUI store has streamBuffers with appendStreamLines/consumeAgentStream helpers, and consumeStream iterates
the async iterable into the buffer.
What's missing is the TUI rendering side — actually displaying the stream buffer content to the user. When a work item with an active agent run is selected, the detail pane should show a
scrolling view of the agent's live output.
Needed:
- Detail pane component that renders streamBuffers.get(sessionID) for the active run
- Auto-scroll behavior (follow tail, but allow scroll-up to review)
- Determine what to show: raw agent output, or filtered/formatted (e.g., strip tool call JSON, show only assistant text)
- Handle the transition when a run completes (keep last output visible, or switch to result summary)
