🧹 Fix unused import in seed_query.py

[manupawickramasinghe]

🎯 What: Removed unused import sys from examples/happiness-vector/seed_query.py.
💡 Why: To improve code health and maintainability by removing unused code.
✅ Verification: Verified by checking that seed_query.py compiles and executes --help correctly without syntax errors.
✨ Result: Improved codebase cleanliness and removed unnecessary import.

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PR created automatically by Jules for task 5091584917087187681 started by @manupawickramasinghe

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