test(staged): cover rs fmt integration

[chenjiahan]

This PR adds an end-to-end Git fixture for passing staged files from rs staged to rs fmt. It covers filenames with spaces, explicit staged files ignored by .gitignore, define.fmt.ignorePatterns, Git index updates, and formatter failure propagation.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 23839846-e35e-4826-9f21-b41a4fccef85

📥 Commits

Reviewing files that changed from the base of the PR and between 688d827 and 48ef6e2.

📒 Files selected for processing (1)

• packages/rstack/tests/cli/staged/fmt.test.ts

📝 Walkthrough

Walkthrough

Added staged-format CLI integration tests. The tests create isolated temporary Git projects and invoke rs fmt on staged files. They verify formatting, Git index updates, ignore rules, filenames with spaces, formatter failure status, SyntaxError output, and unchanged invalid files.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies integration test coverage for the staged formatting workflow.
Description check	✅ Passed	The description directly explains the end-to-end Git fixture and the behaviors covered by the tests.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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

📝 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-staged-fmt-integration

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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/cli/staged/fmt.test.ts`:
- Around line 42-48: Update the test environment setup around the env object to
remove inherited GIT_* variables, especially GIT_DIR, GIT_WORK_TREE, and
GIT_INDEX_FILE, before assigning the fixture-specific GIT_CONFIG_GLOBAL and
GIT_CONFIG_NOSYSTEM values. Preserve the existing process environment and color
settings while ensuring Git operates on projectPath.

🪄 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: e35a4abc-91ac-4518-8ba4-af746a8ff638

📥 Commits

Reviewing files that changed from the base of the PR and between db33067 and 688d827.

📒 Files selected for processing (1)

• packages/rstack/tests/cli/staged/fmt.test.ts

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