Florian Mücke 9f91f38d35
add Expert C++ Software Engineer chat mode (#265)
* feat(chatmodes): add Expert C++ Software Engineer mode and integrate into README

Introduce a concise, standards-driven C++ expert chat mode focused on maintainability, clarity, and evolving industry best practices.

- Add new chat mode file (C++ expert)

- Register in README with install badges

- Simplify guidance (avoid prescriptive details)

- Emphasize behavior-focused testing and legacy code strategies (Michael Feathers)

* apply "node update-readme.js"
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