- Add .github/msbuild.json with two owners: one matching file-based
diagnostics (File(line,col): error/warning CODE: msg [project]) and
one matching engine-level errors without file/line info.
- Register the matcher in src/main.ts via the ##[add-matcher] workflow
command, resolved relative to __dirname so it works from the ncc
bundle in dist/.
- Add src/__tests__/msbuild-matcher.test.ts validating the matcher
regexes against representative CS/MSB error and warning lines.
- Document the new problem matcher in README.md.
- Rebuild dist/index.js via npm run build && npm run pack.
Fixes#4
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>