Release v0.4.12

[julio4]

Release v0.4.12

Pre-merge Checklist

• Changelog reviewed and edited for clarity
• Breaking changes documented (if any)
• Tested on testnet/devnet
• All CI checks passing

What happens on merge?

• Tag op-rbuilder/v0.4.12 will be automatically created
• Release workflow will build binaries and Docker images
• GitHub release will be published

Notes

Add any breaking changes or migration notes here.

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Generated by scripts/prepare-release.sh

[Copilot]

Pull request overview

Prepares the repository for the v0.4.12 release by updating the workspace versioning and recording the release notes in the changelog.

Changes:

• Add a new 0.4.12 section to crates/op-rbuilder/CHANGELOG.md with the included commits/PRs.
• Bump the workspace package version from 0.4.11 to 0.4.12 in Cargo.toml.
• Update Cargo.lock to reflect 0.4.12 for workspace crates.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
crates/op-rbuilder/CHANGELOG.md	Adds release notes entry for 0.4.12.
Cargo.toml	Bumps workspace package version to 0.4.12.
Cargo.lock	Updates locked workspace crate versions to 0.4.12.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

crates/op-rbuilder/benches/bench_build_candidate.rs:113

• OpChainSpecBuilder::optimism_mainnet() appears inconsistent with the rest of this benchmark configuration: transactions are signed with CHAIN_ID = 8453 (Base mainnet). If the chain spec is actually Optimism mainnet (chain id 10), tx validation/signature checks may reject the generated transactions and skew or break the benchmark.

Consider either switching the chainspec builder back to the Base mainnet variant, or updating the benchmark’s CHAIN_ID/assumptions to match the chosen chainspec (ideally deriving the chain id from chain_spec.chain_id() to prevent drift).

        let chain_spec = Arc::new(
            OpChainSpecBuilder::optimism_mainnet()
                .jovian_activated()
                .build(),
        );

[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated no new comments.