Pezkuwi chains use "bizinikiwi" signing context instead of standard
"substrate" context used by Polkadot ecosystem. This was causing
"bad signature" errors on HEZ transfers.
Changes:
- Add sr25519-bizinikiwi native Rust binding with bizinikiwi context
- Add isPezkuwiChain extension to detect Pezkuwi ecosystem chains
- Add PezkuwiKeyPairSigner for signing with bizinikiwi context
- Modify SecretsSigner to use correct context based on chain:
- Pezkuwi chains (3) -> BizinikiwSr25519 (bizinikiwi)
- Other chains (98+) -> KeyPairSigner (substrate)
- Add live transfer test for Pezkuwi mainnet
Tested with successful HEZ transfer on Pezkuwi mainnet:
TX: 0xe25a4eaaeaa04122cca130582dba3cacb2280dea5d908924b45757ea67c27996
