yyle88 / egobatch / 18712935461

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Fix nil pointer panic in constraint.Pass via direct comparison

- Replace errors.Is with utils.Same to avoid panic when comparing nil pointer param
- Add Same function to utils package for safe comparable type comparison
- Add detailed warning comments explaining why errors.Is causes panic
- Root cause: Most error types Is method don't check if self is nil, causing panic
- When E is pointer type, errors.Is(nonNilErr, nil) triggers Is(nil) causing panic
- Direct == comparison is safe because ErrorType constraint requires comparable

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