feat: re-export cxx::Exception

[nyurik]

No description provided.

[Copilot]

Pull Request Overview

This PR re-exports the cxx::Exception type to simplify usage throughout the codebase and updates function signatures to use the shorter Exception type alias instead of the fully qualified cxx::Exception.

• Adds a re-export of cxx::Exception as Exception at the module level
• Updates all trait method return types to use the simplified Exception type
• Improves code readability by removing repetitive cxx:: prefixes

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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