feat: add wrapped tokens contract for cross-chain assets#315
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- Implement WrappedTokensContract with full mint/burn lifecycle - Multi-operator confirmation threshold for wrap requests - Replay prevention via source chain tx ID tracking - Fee collection system with configurable fee_bps and min_fee - Emergency pause/unpause with operator and admin controls - SEP-41 compatible token ops (transfer, approve, transfer_from) - Supply tracking and custody statistics - Comprehensive test suite with 20 test cases
- Merkle tree claim verification (sorted-pair sha256, OpenZeppelin-compatible) - Distribution creation: Airdrop, Incentive, PlayerReward, Grant kinds - Batch distribution creation (up to 20 per tx) - Per-claimer claim history and full claim records - Expiry enforcement with lazy status update on claim attempt - mark_expired housekeeping callable by anyone after expiry - Unclaimed token recovery by creator or admin post-expiry - Admin cancel with immediate refund to creator - Fee-free: all tokens flow directly to claimers - 20 comprehensive tests covering all acceptance criteria
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close #302