Implements read-only agent output viewing in the TerminalPanel as a
separate tab group alongside interactive PTY terminal sessions.
- useAgentStream hook: SSE connection to /api/orchestrator/events with
exponential backoff reconnect, per-agent output accumulation, and
full lifecycle tracking (spawning→running→completed/error)
- AgentTerminal component: read-only <pre>-based output view with ANSI
stripping, status indicator (pulse/dot), status badge, elapsed duration,
copy-to-clipboard, and error message overlay
- TerminalPanel integration: agent tabs appear automatically when agents
are active, show colored status dots, dismissable when completed/error,
and section divider separates terminal vs agent tabs
- 79 new unit tests across useAgentStream, AgentTerminal, and TerminalPanel
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
