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PR_DESCRIPTION_#658.md

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feat(web3): XDR Encoding/Decoding Utilities with Type-Safe Contract Wrappers

Closes #658

Summary

Implements utility functions for encoding and decoding Stellar XDR contract arguments and return values, plus type-safe wrappers generated from Soroban contract bindings.

Changes

File Description
novaRewards/backend/lib/xdr-codec.ts Core codec — encodeContractArgs, decodeContractResult, decodeContractEvent, address helpers
novaRewards/backend/lib/contract-wrappers.ts Type-safe wrappers for nova-rewards, nova_token, reward_pool, campaign contracts
novaRewards/backend/tests/xdr-codec.test.js 25 unit tests covering all encode/decode round-trips

Acceptance Criteria

  • encodeContractArgs(functionName, args) encodes arguments to XDR ScVal
  • decodeContractResult(xdr) decodes XDR ScVal to TypeScript types
  • decodeContractEvent(event) parses Horizon event XDR to typed objects
  • Type-safe wrappers generated from Soroban contract TypeScript bindings (contract-wrappers.ts)
  • Unit tests cover encoding/decoding round-trips for all contract function signatures