feat(bin/node): L2 Chain ID Abstraction

[varun-doshi]

Fixes #2316

[Copilot]

Pull Request Overview

Abstracts the L2 chain ID to a Chain enum instead of raw u64 for improved type safety.

• Changed l2_chain_id in RollupConfig from u64 to Chain, updating defaults and conversions.
• Replaced hardcoded chain IDs with Chain::{optimism_sepolia, optimism_mainnet, base_sepolia, base_mainnet} in test utilities and module initializers.
• Propagated Chain usage through batch decoding, gossip, protocol builders, and executor environment; added the alloy-chains dependency where needed.

Reviewed Changes

Copilot reviewed 17 out of 21 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
crates/protocol/registry/src/test_utils/op_sepolia.rs	Use Chain::optimism_sepolia() for L2 chain ID
crates/protocol/registry/src/test_utils/op_mainnet.rs	Use Chain::optimism_mainnet() for L2 chain ID
crates/protocol/registry/src/test_utils/base_sepolia.rs	Use Chain::base_sepolia() for L2 chain ID
crates/protocol/registry/src/test_utils/base_mainnet.rs	Use Chain::base_mainnet() for L2 chain ID
crates/protocol/protocol/src/batch/core.rs	Converted .derive() call to accept Chain via .into()
crates/protocol/genesis/src/rollup.rs	Changed l2_chain_id type to Chain and updated defaults
crates/protocol/genesis/src/chain/config.rs	Converted builder to .into() on chain_id
crates/protocol/genesis/Cargo.toml	Added alloy-chains dependency
crates/proof/executor/src/builder/env.rs	Updated .with_chain_id() to use .into()
crates/node/service/src/actors/network/builder.rs	Updated discovery builder to use .id() on Chain
crates/node/service/Cargo.toml	Added alloy-chains workspace dependency
crates/node/p2p/tests/common/mod.rs	Use Chain::optimism_mainnet() in test setup
crates/node/p2p/src/gossip/handler.rs	Switched test handlers to use Chain enum
crates/node/p2p/src/gossip/driver.rs	Updated ENR validation to use .into() on Chain
crates/node/p2p/src/gossip/block_validity.rs	Updated signature and tests to use .into() on Chain
crates/node/p2p/src/gossip/behaviour.rs	Switched test behavior to use Chain enum
crates/node/p2p/Cargo.toml	Added alloy-chains workspace dependency

[Copilot]

The trace macro is printing a Chain enum directly with {}, which may not render the numeric ID as expected. Use self.handler.rollup_config.l2_chain_id.id() (or .into()) to log the actual u64 chain ID.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 82.2%. Comparing base (dcaf58a) to head (ec236ed).
Report is 28 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/node/p2p/src/gossip/driver.rs	0.0%	2 Missing ⚠️
bin/supervisor/src/flags/supervisor.rs	0.0%	1 Missing ⚠️
crates/node/p2p/src/gossip/block_validity.rs	0.0%	1 Missing ⚠️

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[refcell]

Few small changes. Otherwise, looks great

[refcell]

This is great