Defines the structure for data stored in navigation stack persistence.
Used by PersistSwarmUtils to maintain a stack of agent names for navigation history.
agentStack: string[]
The stack of agent names representing navigation history for a client within a swarm.
AgentName is a string identifier (e.g., "agent1", "agent2") for agents in the swarm system,
tracking the sequence of active agents for a SessionId within a SwarmName.