serialize

Serializes the DustLocalState to bytes for persistent storage.

Serialization Format: Uses Midnight's SCALE codec (same as Rust's Serializable trait). The serialized data includes:

• All dust tokens

• Dust parameters

• Internal state

Usage:

val serialized = state.serialize()
if (serialized != null) {
    database.saveDustState(serialized)
}

Deserialization: Use deserialize to restore a state from these bytes.

Error Handling: Returns null if:

• State is closed

• Native function returns null (serialization error)