Split validate_status into validate and check for clarity

[FernandoCelmer]

Summary

• Removed the confusing raise_error parameter from validate_status() — it now always raises on error (the common case)
• Added a new check_status() method that returns a StatusResponse without raising, for callers that need to inspect the result
• Updated the test that used raise_error=False to use check_status() instead

Closes #39

Test plan

• All 149 existing tests pass
• Pre-commit hooks (ruff lint/format) pass

[FernandoCelmer]

🔍 Code Review — No issues found. LGTM, safe to merge.