ci: overlap Rust and Nix setup

[robjtede]

Run Rust and Cargo tool setup in parallel with Nix installation and nicknovitski/nix-develop. Wait for both before running checks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 265c365b-caec-41f4-9407-c54ba0cfba0c

📥 Commits

Reviewing files that changed from the base of the PR and between b4c157a and 722bd14.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/coverage.yml

Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The CI and coverage workflows now start the Nix devshell in the background before installing Rust tooling, then wait for the devshell step before continuing.

Changes

Workflow setup

Layer / File(s)	Summary
Start and wait for the Nix devshell .github/workflows/ci.yml, .github/workflows/coverage.yml	Both workflows start the Nix devshell in the background before Rust setup and wait for it before continuing. In CI, this also moves cargo-nextest installation before the wait.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 722bd

The workflows now start the Nix devshell in the background while Rust installs, then wait for it at the original handoff point. No concrete merge-blocking risk was found.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: overlapping Rust installation with Nix setup in CI workflows.

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