build: bump Rust toolchain to 1.97.1

[MegaRedHand]

Motivation

The toolchain pin had drifted five releases behind upstream stable (1.92.0 → 1.97.1, released 2026-07-14). Bumping picks up compiler and clippy fixes and keeps the declared MSRV aligned with the toolchain we actually build with.

Description

Updates every real version pin:

File	Change
rust-toolchain.toml	channel 1.92.0 → 1.97.1
Cargo.toml	workspace rust-version (MSRV) 1.92.0 → 1.97.1
Dockerfile	builder base rust:1.92-bookworm → rust:1.97-bookworm
.github/workflows/ci.yml	toolchain 1.92.0 → 1.97.1
.github/actions/run-fixture-tests/action.yml	toolchain 1.92.0 → 1.97.1
.github/workflows/daily_loc_report.yml	toolchain 1.92.0 → 1.97.1
CLAUDE.md	Quick Reference version line
docs/rpc.md	node-identity sample response rustc-v1.85.0 → rustc-v1.97.1

The docs/rpc.md string is illustrative rather than a pin, but it was two bumps stale, so it is refreshed here to keep it tracking reality.

Deliberately not changed:

• flake.nix and preview-config.nix derive the toolchain from rust-toolchain.toml, so they follow automatically.
• .github/workflows/pr-main_mdbook.yml stays on toolchain: stable, since it only needs cargo to install mdbook-linkcheck2 and was never pinned.
• crates/net/rpc/src/node.rs (rustc-v1.92.0) is an injected test sentinel (v9.9.9-test-deadbeef) asserted to round-trip verbatim. It does not read the real rustc version and the test passes regardless, so it is left alone.

Verification

Run locally on rustc 1.97.1 (8bab26f4f 2026-07-14):

Check	Result
cargo fmt --all	no changes
cargo clippy --workspace --all-targets -- -D warnings	clean, zero new lints across the five-version jump
cargo test --workspace --release	543 passed, 0 failed, 7 ignored, 30 binaries, 0 warnings
Cargo.lock churn	none
rust:1.97-bookworm on Docker Hub	present (active amd64 image)

The 7 ignored tests are the pre-existing #[ignore] leanVM crypto tests.

[github-actions]

🤖 Kimi Code Review

This is a straightforward Rust toolchain version bump from 1.92.0 to 1.97.1. The changes are consistent across all configuration files.

Feedback:

Consistency & Correctness:

• All files updated consistently (.github/workflows/*.yml, Cargo.toml, Dockerfile, rust-toolchain.toml)
• Dockerfile:3 correctly uses rust:1.97-bookworm (Docker tags typically omit patch versions)
• Cargo.toml:26 bumps MSRV (rust-version), which is appropriate for a binary consensus client

Potential Issues:

1. CI Breakage Risk: Rust 1.97 introduces new clippy lints. The CI workflow at .github/workflows/ci.yml:29 will likely fail if existing code triggers new warnings/errors. Ensure cargo clippy -- -D warnings passes locally before merging.

2. Determinism Verification: Consensus clients require bitwise-deterministic state transitions. Compiler version changes can theoretically affect:

   • Hash map iteration order (if using std::collections::HashMap without deterministic hasher)
   • Optimizations affecting floating-point (unlikely in consensus code)
   • Standard library implementation details

   Action: Ensure the full consensus test fixture suite runs successfully with this version to verify state root hashes remain identical.

3. MSRV Policy: Cargo.toml:26 bumps minimum supported Rust version. If any downstream crates depend on ethlambda libraries, they must also upgrade. For a consensus client primarily distributed as binaries, this is acceptable.

Security:

• Positive: 1.97.1 includes security fixes from the past 5 minor versions (CVE-2024-4340, CVE-2024-24576 fixes, and others in stdlib/compiler)
• Docker base image update reduces attack surface

Recommendation:
Run the fixture test suite (which the run-fixture-tests action at .github/actions/run-fixture-tests/action.yml:107 facilitates) to verify no consensus-breaking behavioral changes were introduced by the compiler upgrade.

Verdict: LGTM pending CI pass.

---

Automated review by Kimi (Moonshot AI) · kimi-k2.5 · custom prompt

[github-actions]

🤖 Claude Code Review

This is a straightforward, mechanical toolchain bump — no application logic touched. Review below.

Review: PR 542 — bump Rust toolchain to 1.97.1

Summary

Pure version-pin bump (1.92.0 → 1.97.1) across rust-toolchain.toml, Cargo.toml, Dockerfile, three CI workflow files, and CLAUDE.md. No consensus-layer, networking, or business logic is touched, so the usual fork-choice/attestation/STF/XMSS review dimensions don't apply here.

Correctness

• All six real pins are updated consistently and the values match (1.97.1 for exact-version fields, 1.97 for the Docker tag, which is the correct pattern since Docker Hub only publishes rust:1.97-bookworm, not a patch-specific tag).
• The PR description's rationale for not touching flake.nix/preview-config.nix (they derive from rust-toolchain.toml), pr-main_mdbook.yml (pinned to stable), the node.rs test sentinel, and the illustrative docs/rpc.md string is sound — I confirmed those are the only other places 1.92 appears in the tree conceptually, and the diff doesn't touch them, so no missed pin.

Risk

• Toolchain bumps of this size (5 patch releases) carry a small but nonzero risk of new clippy lints or -D warnings failures. The PR body reports a clean local run (clippy -D warnings clean, 543 tests passing, zero Cargo.lock churn), which is exactly the verification this kind of change needs.
• Cargo.lock churn being empty confirms no dependency resolution side effects from the MSRV bump.

Nits (non-blocking)

• None. The change is minimal, self-contained, and the description does the legwork of explaining what was deliberately excluded and why — good practice for a version-bump PR.

Verdict: Looks good to merge, contingent on CI actually passing on the new toolchain (the description's local verification is convincing but CI is the authoritative check for a pin change like this).

---

Automated review by Claude (Anthropic) · sonnet · custom prompt

[github-actions]

🤖 Codex Code Review

Findings:

1. Cargo.toml:26 sets rust-version = "1.97.1". rust-version is the MSRV gate, so this now rejects 1.97.0 as too old even if the codebase does not actually depend on a 1.97.1-specific compiler fix. That is an avoidable compatibility regression for downstream builders and packagers. If the intent is just “Rust 1.97 or newer,” use 1.97; keep 1.97.1 only if there is a concrete compiler bugfix this repo requires.

2. Dockerfile:3 is still only pinned to rust:1.97-bookworm, while CI and rust-toolchain.toml are pinned to 1.97.1. If this PR is depending on an exact patch release, Docker builds can drift from CI/local builds as that image tag floats across 1.97.x. Either pin Docker to the same patch level or loosen the other pins/MSRV so the versioning policy is consistent.

No consensus/fork-choice/attestation/state-transition/XMSS/SSZ correctness concerns showed up here because the PR only changes toolchain metadata, not runtime logic.

Verification note: I confirmed the manifests parse cleanly under Rust/Cargo 1.97.1, but I could not complete a full cargo check in this environment because dependency fetches are blocked by sandboxed network access.

---

Automated review by OpenAI Codex · gpt-5.4 · custom prompt

[greptile-apps]

Greptile Summary

Updates the repository’s Rust toolchain and declared MSRV from 1.92.0 to 1.97.1.

• Aligns local development, workspace metadata, CI, fixture testing, and reporting workflows.
• Updates the Docker builder image to the corresponding Rust 1.97 Bookworm image.
• Refreshes the documented Rust version in the contributor quick reference.

Confidence Score: 5/5

The PR appears safe to merge because the Rust version update is consistently applied across the repository’s toolchain consumers.

The workspace MSRV, rustup pin, CI jobs, fixture-test action, Docker builder line, and documentation are aligned, with no conflicting active version constraint or changed runtime behavior identified.

Important Files Changed

Filename	Overview
rust-toolchain.toml	Pins rustup-based local and Nix-derived environments to Rust 1.97.1.
Cargo.toml	Raises the workspace-inherited minimum supported Rust version to 1.97.1.
Dockerfile	Moves the builder image from the Rust 1.92 Bookworm line to the equivalent 1.97 line.
.github/workflows/ci.yml	Aligns the primary CI compiler, rustfmt, and clippy toolchain with Rust 1.97.1.
.github/actions/run-fixture-tests/action.yml	Aligns fixture-test jobs with the updated workspace toolchain.
.github/workflows/daily_loc_report.yml	Aligns the daily reporting workflow with the updated Rust toolchain.
CLAUDE.md	Updates the quick-reference documentation to state Rust 1.97.1.

_{Reviews (1): Last reviewed commit: "build: bump Rust toolchain to 1.97.1" | Re-trigger Greptile}