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F-007: ci: add dedicated MSRV (1.94) verification job#13

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audit/f-007-stable-msrv-ci-job
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F-007: ci: add dedicated MSRV (1.94) verification job#13
Sephyi wants to merge 1 commit intodevelopmentfrom
audit/f-007-stable-msrv-ci-job

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@Sephyi Sephyi commented Apr 22, 2026

Summary

ci: add dedicated MSRV (1.94) verification job.

Audit context

Closes audit entry F-007 from #3.

Verification

  • cargo fmt --check
  • cargo clippy --all-targets --all-features -- -D warnings
  • cargo test --all-targets

Note: one pre-existing test porcelain_exits_within_timeout_with_no_staged_changes is a known macOS cold-start flake that reproduces on unmodified development — unrelated to this change.

The existing CI pipeline pinned every job to the same toolchain
(`1.94.0`), which meant the `msrv` job did not actually verify the
MSRV floor independently — it just ran the same Rust against the
same build as `clippy` and `test`.

Split the toolchain into two env vars:
- `RUST_TOOLCHAIN: stable` for fmt/clippy/test/test-eval (latest)
- `MSRV_TOOLCHAIN: "1.94"` for the dedicated `msrv` job

Also adjust the `msrv` job so it:
- Uses the pinned MSRV toolchain explicitly
- Runs with `--all-features --all-targets` to ensure every feature
  path compiles against the floor
- Runs in parallel with other jobs (removed the `needs: fmt`
  dependency so it cannot be masked by an upstream failure)

`cargo check` is kept (vs `cargo test`) since checking is sufficient
to prove the MSRV floor compiles without bloating CI runtime.

Closes audit entry F-007 from #3.
Copilot AI review requested due to automatic review settings April 22, 2026 19:50
@Sephyi Sephyi added the audit Codebase audit cleanup (issue #3) label Apr 22, 2026
@Sephyi Sephyi self-assigned this Apr 22, 2026
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Pull request overview

Updates the GitHub Actions CI workflow to properly verify the project’s Minimum Supported Rust Version (MSRV) independently from the main CI toolchain, aligning with the audit finding F-007 and the PRD’s “stable + MSRV” CI matrix goal.

Changes:

  • Switch primary CI toolchain from a pinned Rust version to stable.
  • Add MSRV_TOOLCHAIN env var and update the msrv job to use it.
  • Expand the MSRV job to cargo check --all-features --all-targets.

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Comment thread .github/workflows/ci.yml
Comment on lines +23 to +24
RUST_TOOLCHAIN: "stable"
MSRV_TOOLCHAIN: "1.94"
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The PR description/title focus on adding a dedicated MSRV verification job, but this diff also changes the primary CI toolchain for fmt/clippy/test from a pinned 1.94.0 to floating stable. That’s a meaningful behavior change (CI will now track latest stable) and should be called out explicitly in the PR description (or the workflow should keep using the pinned toolchain if that change is unintended).

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