fix(tooling): use canonical Rust LLVM component

[mamayer19]

Summary

• configure the Rust toolchain with mise's canonical llvm-tools component name
• keep the gateway coverage prerequisite documentation aligned
• add a semantic regression test for the required Rust component set

Validation

• clean bootstrap with isolated Rust and Cargo homes
• post-bootstrap mise install rust --dry-run-code --verbose reports Rust 1.97.0 already installed
• rustup reports llvm-tools-aarch64-apple-darwin installed
• pytest -q tools/ci/tests/test_public_tree.py (6 passed)
• Ruff format and lint checks

Summary by CodeRabbit

• Chores

  • Updated Rust toolchain configuration to use the canonical llvm-tools component.
  • Updated coverage setup documentation to reflect the current component name.

• Tests

  • Added validation that the Rust environment includes the required rustfmt, clippy, and llvm-tools components.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: b1349471-3291-4466-bd5a-e75413cc3f65

📥 Commits

Reviewing files that changed from the base of the PR and between d0fa3ce and 2e9e8e0.

📒 Files selected for processing (3)

• mise.toml
• tools/ci/tests/test_public_tree.py
• tools/mise_tasks/gateway-coverage.bash

Included review availability: 9 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 10 reviews per hour.

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📝 Walkthrough

Walkthrough

The Rust tool configuration now uses llvm-tools. A CI test verifies the canonical Rust component set. The gateway coverage task documents the updated component name.

Changes

Canonical Rust Components

Layer / File(s)	Summary
Configure and validate canonical components mise.toml, tools/ci/tests/test_public_tree.py, tools/mise_tasks/gateway-coverage.bash	The Rust configuration uses rustfmt, clippy, and llvm-tools. The test parses mise.toml and verifies this exact set. Coverage documentation uses the same component name.

Merge Risk: ⚪ Minimal · up to 2e9e8

Rust bootstrap configuration now uses the canonical LLVM tools component, with matching validation and coverage documentation. No current merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 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: using the canonical Rust LLVM component for tooling.
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (1 skipped: 1 unsupported.)

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-mise-rust-component

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