Build thread-safe data persistence in Swift

Persist Swift actor state across app termination and restore on relaunch

Swift concurrency apps needing lightweight actor state persistence without database overhead.

• · actor state (Codable)
• · file path for persistence storage

• · serialized state file
• · actor restored from disk on init

• · Swift Codable protocol
• · FileManager

Actor conforms to Codable; file system permissions granted; Swift 5.9+

• · actor state not Codable
• · disk write permission denied
• · file corruption on read

• · actor-native pattern
• · Codable-based serialization
• · fail-safe init recovery