refactor: make s3_uri_to_key a public helper in results_utils

[Copilot]

_s3_uri_to_key was a private-by-convention function in results_utils.py that was being imported directly into job_utils.py, violating module encapsulation and making future refactors fragile.

Changes

• results_utils.py: Renamed _s3_uri_to_key → s3_uri_to_key; updated internal call site in _get_run_output_keys
• job_utils.py: Updated import and call site to use the renamed public function

# Before
from .results_utils import _s3_uri_to_key, get_sample_id_for_result, sync_bindcraft_outputs

# After
from .results_utils import get_sample_id_for_result, s3_uri_to_key, sync_bindcraft_outputs

---

🔒 GitHub Advanced Security automatically protects Copilot coding agent pull requests. You can protect all pull requests by enabling Advanced Security for your repositories. Learn more about Advanced Security.