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bb189aeb8a
PezkuwiChain requires AuthorizeCall as the first signed extension in the TxExtension tuple. This commit adds: - AuthorizeCall.kt: FixedValueTransactionExtension with empty payload (PhantomData equivalent) - CustomTransactionExtensions: Detects PezkuwiChain via metadata and adds AuthorizeCall extension - ExtrinsicBuilderFactory/ExtrinsicSplitter: Uses CustomTransactionExtensions Without this fix, transactions fail with "bad signature" errors and fee calculation (payment_queryInfo) fails with WASM trap errors.