Parse full TransactionData from archive once @mysten/sui/bcs adds missing TransactionKind variants

[tamashi095]

Context

jun replay fetches checkpoints from the Sui checkpoint archive and decodes them. Currently we decode:

• ✅ CheckpointSummary BCS → timestamp, epoch
• ✅ TransactionEffects BCS → tx digest, status, gas
• ✅ TransactionEvents BCS → events with BCS contents
• ❌ TransactionData BCS → sender, transaction kind, commands

Problem

@mysten/sui/bcs defines TransactionKind with only 4 of 10+ variants:

// SDK (packages/sui/src/bcs/bcs.ts)
export const TransactionKind = bcs.enum('TransactionKind', {
    ProgrammableTransaction: ProgrammableTransaction,
    ChangeEpoch: null,
    Genesis: null,
    ConsensusCommitPrologue: null,
});

The Rust source (sui/crates/sui-types/src/transaction.rs) has:

• AuthenticatorStateUpdate (variant 4)
• EndOfEpochTransaction (variant 5)
• RandomnessStateUpdate (variant 6)
• ConsensusCommitPrologueV2 (variant 7)
• ConsensusCommitPrologueV3 (variant 8)
• ConsensusCommitPrologueV4 (variant 9)
• ProgrammableSystemTransaction (variant 10)

Every mainnet checkpoint has a V3 or V4 prologue, so bcs.TransactionData.parse() fails on all recent data.

Impact

• transactions.sender is null for archive-sourced data
• Can't decode transaction commands/inputs from archive

Action

Once MystenLabs/ts-sdks adds the missing variants, update jun's archive client to decode transaction.bcs.value and populate the sender field.

Upstream issue: https://github.com/MystenLabs/ts-sdks/issues/TBD