🧹 Refactor stats generation to use StatsContext dataclass

[marko1olo]

🎯 What: Resolved Too Many Parameters code health issue in stats generation functions.
💡 Why: Encapsulating parameters into a StatsContext dataclass improves maintainability and readability.
✅ Verification: Ran test_stats_generator.py and the full test suite to ensure no regressions.
✨ Result: Cleaner function signatures.

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PR created automatically by Jules for task 16323634436663923115 started by @marko1olo

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