[bxpana]

Adds ZKsync Era Testnet (chain 312), Matter Labs' EraVM testnet settling on Sepolia.

• Listed in ethereum-lists/chains as eip155-312 (Add ZKsync Era Testnet (chain 312) ethereum-lists/chains#8899) and in the published chainid.network/chains.json.
• Uses the ZKsync chainConfig (formatters, serializers, EIP-712 domain), same as zksyncSepoliaTestnet.
• RPC https://rpc.zksync-era-testnet.zksync.dev and WebSocket wss://rpc.zksync-era-testnet.zksync.dev/ws both return eth_chainId 0x138. zks_L1ChainId returns 0xaa36a7 (Sepolia) and the base token is ETH.
• Explorer at https://block-explorer.zksync-era-testnet.zksync.dev, with its Etherscan-style API at https://block-explorer-api.zksync-era-testnet.zksync.dev/api (getblocknobytime returns status 1).
• Multicall3 at the canonical 0xcA11bde05977b3631167028862bE2a173976CA11, verified on the explorer (src/Multicall3.sol:Multicall3) with bytecode identical to mainnet's. blockCreated: 10618 is the block of its creation transaction (eth_getCode is empty at 10617 and non-empty at 10618).

Checks run locally:

• pnpm test:chains --run -t "ZKsync Era Testnet": 4 passed (http, webSocket, blockExplorer.url, blockExplorer.apiUrl)
• tsc -p tsconfig.build.json --noEmit: passes
• biome check on the changed files: no issues
• size-limit for the viem/chains entries: within limits
• Live multicall against the RPC through zksyncEraTestnet returns getChainId 312

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The changes in this PR will be included in the next version bump.

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