Stellar batch operation builder (atomic multi-op transactions)

[truthixify]

Tier: M (2-4 days) Type: feature

Context

Stellar supports up to 100 operations per transaction with atomic semantics. Useful for stealth scenarios: send to N stealth addresses + emit N announcements in one tx without needing the splitter contract.

Scope

• StellarBatchBuilder that accepts multiple stealth payment configs
• Builds a single transaction with the corresponding ops
• Validates total fee against account balance
• Splits into multiple transactions if op count > 100
• Returns transaction(s) ready to sign

Acceptance criteria

• Builder + tests
• Op-count splitting logic
• Documentation
• Demo follow-up for batch send UI

Files to start with

• New: sdk/src/chains/stellar/batch.ts