Function restore_from_cloud 

pub async fn restore_from_cloud(
    store_id: &str,
    store_root: StoreRootRef,
    founder_pubkey: &str,
    serialized_keyring: Option<&str>,
    store_name: &str,
    synced_tables: &[SyncedTable],
    migrations: &[Migration],
    expected_write_policy: WritePolicy,
    custody: Arc<dyn MasterKeyCustody>,
    identity_custody: Arc<dyn DeviceIdentityCustody>,
    source: RestoreSource,
    membership_floor: &MembershipFloor,
    keypair: &UserKeypair,
    authority: &RestoreAuthority,
    continuation_device_signer: Option<&UserKeypair>,
    layout: &StoreLayout,
    clock: ClockRef,
    ids: IdRef,
    on_status: impl Fn(&str),
    cancel: &Receiver<bool>,
) -> Result<Config, BootstrapError>

Restore a store from cloud storage.

Validates inputs, constructs the cloud home from the source, runs the sync protocol, and sets the store as active. keypair is the restored device’s signing identity (recovered from the restore code); the storage signs the control objects it writes with it, and it is the same key the caller imports once restore succeeds.