feat(setup): expose the rs setup command

[chenjiahan]

This PR exposes the default Git hook installer through rs setup, making the installer available from the CLI without loading Rstack config or creating user hooks. It adds command-specific help, strict option validation, and concise output and exit-code handling for installed, unchanged, skipped, and failed results. The command remains non-interactive and introduces no runtime dependencies.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7046089f-7fdb-4245-8eb1-9aba34097efa

📥 Commits

Reviewing files that changed from the base of the PR and between d8964a6 and 8b2ff5c.

📒 Files selected for processing (3)

• packages/rstack/src/cli/commands.ts
• packages/rstack/src/setup/index.ts
• packages/rstack/tests/cli/setup/index.test.ts

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📝 Walkthrough

Walkthrough

Adds an rstack setup command with help output, strict option parsing, and Git hook installation status handling. The command reports installed, unchanged, skipped, and error outcomes. CLI dispatch and help text are updated. Tests cover help aliases, unknown options, hook installation and idempotence, configuration isolation, non-Git directories, and missing Git executables.

🚥 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: adding a setup command to the CLI.
Description check	✅ Passed	The description matches the implemented setup command, help text, validation, and output behavior.
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/feat-rs-setup-command

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