point ARAX URL to a specific Retriever-configured instance.

[edeutsch]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.35%. Comparing base (a462e63) to head (901e746).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Coverage Δ
shepherd_utils/config.py	100.00% <100.00%> (ø)

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