test: simplify temporary test fixtures

[chenjiahan]

Summary

This PR simplifies test fixture setup and keeps temporary projects in local, Git-ignored test-temp-* directories. It consolidates shared fmt helpers, removes redundant test logic, and isolates temporary projects from parent Git and Rstest discovery.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The changes isolate temporary test projects from repository discovery and Rstest collection. Shared formatting helpers now create Git-backed projects, write fixture files, and clean up directories. Formatting tests use these helpers instead of local implementations. CLI and setup tests create local temporary directories and configure Git ceiling boundaries. Minor test helpers and config reload setup were simplified.

🚥 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%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: simplifying temporary test fixture setup.
Description check	✅ Passed	The description directly matches the changes by describing fixture simplification, shared helpers, Git isolation, and Rstest exclusion.
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.

✨ 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 chenjiahan/test-cleanup-temp-directories

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/rstack/tests/setup/helpers.ts`:
- Around line 24-32: Sanitize inherited explicit Git repository variables in
both isolated test environments: update the fixture setup around the
GIT_CEILING_DIRECTORIES preservation in
packages/rstack/tests/setup/helpers.ts:24-32 and the corresponding setup in
packages/rstack/tests/cli/setup/index.test.ts:32-36 to remove or temporarily
sanitize those variables, while retaining restoreEnv-based restoration of
GIT_CEILING_DIRECTORIES and all modified environment state.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 54ce8d03-bab5-43c7-a677-bf32b234e6ed

📥 Commits

Reviewing files that changed from the base of the PR and between 21b55e0 and f47c136.

📒 Files selected for processing (14)

• packages/rstack/rstack.config.ts
• packages/rstack/tests/cli/fmt/index.test.ts
• packages/rstack/tests/cli/setup/index.test.ts
• packages/rstack/tests/cli/staged/fmt.test.ts
• packages/rstack/tests/config/reload-app-config/index.test.ts
• packages/rstack/tests/exports/lint-subpath/index.test.ts
• packages/rstack/tests/exports/test-subpath/index.test.ts
• packages/rstack/tests/fmt/discoverPaths.test.ts
• packages/rstack/tests/fmt/discovery.test.ts
• packages/rstack/tests/fmt/helpers.ts
• packages/rstack/tests/fmt/runner.test.ts
• packages/rstack/tests/helpers/cliTest.ts
• packages/rstack/tests/setup/helpers.ts
• packages/rstack/tests/setup/hooks.test.ts

💤 Files with no reviewable changes (2)

• packages/rstack/tests/exports/lint-subpath/index.test.ts
• packages/rstack/tests/exports/test-subpath/index.test.ts