fix(chains): preserve OP predeploy contracts on Zircuit

[mk0walsk]

This PR fixes a silent config-loss bug in Zircuit OP Stack chain definitions.

What is this PR solving?

zircuit and zircuitGarfieldTestnet spread ...chainConfig at the top level, but their contracts objects did not spread ...chainConfig.contracts, which overwrote OP predeploy defaults (for example gasPriceOracle, l1Block, and l2ToL1MessagePasser).

This change adds ...chainConfig.contracts in:

• src/chains/definitions/zircuit.ts
• src/chains/definitions/zircuitGarfieldTestnet.ts

Related: #4423

What alternatives were explored?

• Deep-merging contracts inside defineChain was considered, but it would change merge semantics globally.
• Copying OP predeploy entries directly into Zircuit files was considered, but it duplicates source-of-truth and increases drift risk.
• Changing src/op-stack/contracts.ts was unnecessary because defaults there are already correct.

What should reviewers pay extra attention to?

• Confirm Zircuit-specific contract entries still override inherited defaults where keys overlap.
• Confirm this is a minimal, scoped fix with no behavior changes outside the two Zircuit chain definitions.

Documentation

No documentation update is needed because this is an internal chain-definition correctness fix with no public API change.

Tests

Please run:

• pnpm test:chains
• pnpm check:types

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Latest commit: c01c587

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

This PR includes changesets to release 1 package

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