session/persist.go:
- New multi-agent format: PersistedSession with []PersistedAgent
- PersistSession saves ALL agents, not just first
- RestoreAllSessions returns []RestoredSession with []RestoredAgent
- Backward compatible: restores legacy single-agent format
fs/persist.go:
- Thin wrapper that creates AgentLogs for each restored agent
- Delegates to session.PersistSession/RestoreAllSessions
agent/agent.go:
- Added Messages() to get conversation history
- Added Usage() to get token/cost stats
agent/history.go:
- Added RestoreHistoryFromMessages for multi-agent restore
session/session.go:
- Added Remote() getter
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