ci: overlap Rust and Nix setup

[robjtede]

Run Rust setup in parallel with Nix installation and nicknovitski/nix-develop. Wait for both before checking formatting.

Summary by CodeRabbit

• Chores
  • Formatting checks now prepare their required tools in parallel, reducing setup time.

[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: fe3de14d-b7af-4090-9da8-cfa5cc2c038f

📥 Commits

Reviewing files that changed from the base of the PR and between bcfab3c and 7eb73ea.

📒 Files selected for processing (1)

• .github/workflows/lint.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 format job runs Rust nightly setup and Nix devshell startup in the background. It waits for both steps before running formatting.

Changes

Format job setup

Layer / File(s)	Summary
Background setup and synchronization .github/workflows/lint.yml	The job assigns IDs to Rust nightly setup and devshell startup, runs both steps in the background, and waits for both before formatting.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Refactor

Merge Risk: ⚪ Minimal · up to 7eb73

The parallel setup preserves the required handoff before formatting. No actionable merge-blocking issue is established.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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 and Nix CI setup steps.
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.

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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