feat(workspace): Bump MSRV to 1.88

[clabby]

Overview

Bumps the MSRV of the workspace to rustc 1.88.

[Copilot]

Pull Request Overview

This PR bumps the minimum supported Rust version (MSRV) from 1.86 to 1.88 across the entire workspace. The change affects toolchain configurations, CI workflows, documentation, and includes code modernizations that take advantage of newer Rust features available in version 1.88.

Key Changes

• Updated MSRV from 1.86 to 1.88 in all configuration files
• Modernized string formatting using inline format syntax ({var} instead of {:?}, var)
• Applied const improvements to methods that can be evaluated at compile time
• Replaced then_some().unwrap_or_default() patterns with cleaner if-else expressions

Reviewed Changes

Copilot reviewed 51 out of 58 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rust-toolchain.toml	Updated toolchain channel from 1.86 to 1.88
Cargo.toml	Updated workspace rust-version to 1.88
clippy.toml	Updated MSRV configuration for clippy
README.md	Updated documentation to reflect new MSRV
CLAUDE.md	Updated development documentation
.github/workflows/*	Updated CI workflows to use Rust 1.88
docker/apps/*	Updated Docker image to use Rust 1.88
crates//src/.rs	Applied code modernizations using new Rust features

Comments suppressed due to low confidence (4)

rust-toolchain.toml:2

• Rust version 1.88 does not exist. As of January 2025, the latest stable Rust version is 1.84. Please verify that version 1.88 is available or use a valid version number.

channel = "1.88"

Cargo.toml:4

• Rust version 1.88 does not exist. As of January 2025, the latest stable Rust version is 1.84. Please verify that version 1.88 is available or use a valid version number.

rust-version = "1.88"

clippy.toml:1

• Rust version 1.88 does not exist. As of January 2025, the latest stable Rust version is 1.84. Please verify that version 1.88 is available or use a valid version number.

msrv = "1.88"

docker/apps/kona_app_generic.dockerfile:21

• Rust version 1.88 does not exist. As of January 2025, the latest stable Rust version is 1.84. Please verify that version 1.88 is available or use a valid version number.

ENV RUST_VERSION=1.88

[theochap]

Looks good

[theochap]

Just checking: why are we using a Box here? Is that because of versioning or to avoid clones?

[clabby]

New clippy lint; The variants have a large difference in size.

[clabby]

Updating the cannon-builder and asterisc-builder images

[codecov]

Codecov Report

❌ Patch coverage is 66.15385% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.8%. Comparing base (140d326) to head (4f0ac76).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/supervisor/core/src/supervisor.rs	0.0%	4 Missing ⚠️
crates/node/peers/src/utils.rs	0.0%	2 Missing ⚠️
crates/proof/preimage/src/oracle.rs	0.0%	2 Missing ⚠️
bin/client/src/interop/transition.rs	66.6%	1 Missing ⚠️
crates/node/peers/src/score.rs	0.0%	1 Missing ⚠️
crates/proof/executor/src/builder/assemble.rs	66.6%	1 Missing ⚠️
crates/proof/proof/src/hint.rs	50.0%	1 Missing ⚠️
crates/proof/std-fpvm/src/tracing.rs	0.0%	1 Missing ⚠️
...rotocol/derive/src/stages/batch/batch_validator.rs	0.0%	1 Missing ⚠️
crates/protocol/protocol/src/batch/tx.rs	0.0%	1 Missing ⚠️
... and 7 more

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[clabby]

Needs #2626 + a new release for the FPVM build images.