Simplify logging: remove colorlog, use bool verbose flag

[JustusRijke]

Summary

• Removed debug logging support (simplified to WARNING and INFO levels only)
• Changed verbosity: int parameter to verbose: bool for simplicity
• Removed colorlog dependency, using standard library logging instead
• Removed save_log option
• Refactored check functions to get logger internally instead of passing as parameter

Test plan

• All 9 tests pass
• Code formatted with ruff
• Removed 1 dependency (colorlog)
• Simplified API with bool instead of int verbosity

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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