### Summary
- **Add** `test/suites/native-token-transfer.test.ts` focused on the
HAVE native token lifecycle via Snowbridge v2.
- **Validate** registration, DataHaven → Ethereum mints, Ethereum →
DataHaven unlocks, event emission, and 1:1 backing invariant.
### Tests added
- should register DataHaven native token on Ethereum
- should transfer tokens from DataHaven to Ethereum
- should maintain 1:1 backing ratio
- should emit transfer events
- should transfer tokens from Ethereum to DataHaven (Snowbridge v2)
### What the suite covers
- **Registration**: Sudo-registers the native token; confirms
`ForeignTokenRegistered` on the Gateway; verifies ERC-20 metadata
(`HAVE`/`wHAVE`, 18 decimals).
- **DataHaven → Ethereum**: Executes `transfer_to_ethereum`; asserts
Substrate events (`TokensLocked`, `TokensTransferredToEthereum`);
observes Ethereum `Transfer` mint (from zero address); validates sender
balance delta, sovereign account increase, and ERC-20 recipient credit.
- **Backing invariant**: Ensures sovereign account balance ≥ ERC-20
total supply.
- **Event emission**: Confirms key Substrate events without polling
delays.
- **Ethereum → DataHaven**: Approves and calls `Gateway.sendToken`; if
unsupported locally, the test skips; otherwise asserts burn on Ethereum
and unlock on DataHaven with corresponding balance deltas.
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Co-authored-by: Steve Degosserie <723552+stiiifff@users.noreply.github.com>
