test: add CLI help smoke coverage

[ahfoysal]

Description

Adds smoke coverage for the top-level CLI help and vouch init --help output.

Related Issues

Closes #123

Testing

• pytest tests/ -v
• ruff check tests/test_cli_init.py
• ruff format --check tests/test_cli_init.py

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

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