The course material includes UTF-16 VS upgrade logs that oxfmt cannot
read, which broke `npx oxfmt --check .`. Ignore them by filename.
Also include the SKILL.md frontmatter rewrap from the formatter run.
Co-authored-by: Qwen 3.8 27B <qwen3.8_27b-q3_k_xl@lmstudio.local>
Agent instructions (AGENTS.md), oxfmt config, git workflow skill,
and .gitignore for the C++ course repository.
Co-authored-by: Qwen 3.8 27B <qwen3.8_27b-q3_k_xl@jelly.nrv.nu>