test: speed up staged CLI tests

[chenjiahan]

Summary

The staged CLI tests dominated the suite because each option recreated a Git repository and ran lint-staged in a new process. This PR mocks lint-staged and verifies forwarded options directly while retaining lightweight help and invalid-option CLI coverage. Rstest now extends the Rslib adapter so source tests inherit RSTACK_VERSION from source.define.

Performance

Measured locally on macOS with Node.js v24.12.0 and warm dependencies:

Command	Before	After	Improvement
pnpm --filter rstack test test/cli/staged/index.test.ts	6.16s	0.70s	~89% faster
node --run test	6.78s	1.49s	~78% faster

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: a2d8824c-23cd-42ac-984e-376af4876758

📥 Commits

Reviewing files that changed from the base of the PR and between ad63bb0 and b35b15d.

📒 Files selected for processing (2)

• packages/rstack/rstack.config.ts
• packages/rstack/test/cli/staged/index.test.ts

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📝 Walkthrough

Walkthrough

The test configuration callback is now asynchronous and extends its returned configuration with withRslibConfig(). Staged CLI tests now mock configuration loading and lint-staged execution instead of using temporary git repositories. The suite verifies default options and mappings for long-form, short, and aliased CLI flags.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly captures the main change: speeding up staged CLI tests.
Description check	✅ Passed	The description is directly related to the test refactor and config change in this PR.
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/optimize-staged-tests

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