[Apeksha9389]

Summary

Match pronunciation terms at token boundaries rather than requiring a regex word boundary at each end. This lets add_pronunciation replace punctuated names such as C++, C# and .NET, while leaving longer tokens such as C++17, C#script and ASP.NET intact.

For example, add_pronunciation("Use C++ today.", "C++", "test") now emits a pronunciation control instead of leaving the term unchanged. Matching remains case-sensitive, literal and limited to the first occurrence.

Validation

• 79 related helper and client-construction tests pass.
• Six new cases fail on current main and pass with the fix; an additional embedded-token control passes on both.
• Ruff checks, formatting of the new tests, mypy for the helper, and whitespace checks pass.
• Changes are confined to the hand-written helper, custom regressions and their .fernignore entry.

AI-assisted implementation and regression tests. These custom tests make no provider requests.