fix: restore logger levels after silencing machine output

[Aman-goel-04]

Summary

• Prevents machine-output log silencing from leaking process-global stdlib logger levels across CLI commands and tests.
• Restores the complete prior structlog configuration after machine-output commands finish, including Click option-callback paths.
• Adds regression coverage for scoped log silencing and restores the adapter markdown-output test.

Related Issues

Fixes #1976

Test Plan

• Lint passes (ruff check .) — CI passed
• Tests pass (pytest) — CI passed on Python 3.11, 3.12, and 3.13
• Web build passes (npm run build) (no frontend changes)

Checklist

• My code follows the project's code style
• I have added tests for new functionality
• All existing tests still pass
• I have updated documentation if needed

[Aman-goel-04]

@RaghavChamadiya, please review this PR and let me know if any changes need to be made!

[Aman-goel-04]

Hey @RaghavChamadiya, rebased this onto current main to clear the conflict (there was a real merge collision in health_cmd/command.py against the new --scope production/all feature, resolved so both land together), and fixed a test that referenced the pre-rename helper name. CI's green and it's mergeable now, ready whenever you get a chance to take another look!