- Hoist removeOrphanedTerminalStates to a top-level selector in EventRouter
  for consistency with other store selectors
- Convert timelineMessages IIFE to useMemo with proper deps
- Suppress no-map-spread in ChatView (spread is conditional, immutability required)
- Suppress exhaustive-deps for autoFocus in TerminalViewport (mount-time only)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>