Fix peek on exited sessions, multiple --wait, and TUI exit race
peek and peek --wait now read saved output from exited sessions
(lastLines increased to 200). --wait accepts multiple patterns
(any match). saveExitMetadata runs twice: immediately in onExit
(for status display) and again in close() (for complete output).
Fix TUI exit race by delaying session list refresh 200ms. Fix
SKILL.md examples to use multiple --wait instead of regex.