🧪 Testing Improvement: Policy Shock Parsing

[edithatogo]

🎯 What: The testing gap addressed for ValueError parsing in _numeric_value function when reading policy shock artifacts.
📊 Coverage: Evaluated valid strings, empty/None values, and invalid values for correct ValueError handling. Coverage on the module now exceeds 90%.
✨ Result: Test coverage for the public policy shock plausibility validator logic is improved.

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PR created automatically by Jules for task 17701938693260663316 started by @edithatogo

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