Document and separate release artifacts from untracked workspace files

[Metrohan]

What to build / Ne yapılacak

EN: The working tree contains several untracked workspace/tooling files that should never end up in version history or releases (.codegraph/, .cursor/, .superpowers/, EVENTRADAR_COMPLETE_PROMPTS.md, coverage.xml, etc.). The project's .gitignore and contributor docs should make this boundary explicit.

TR: Çalışma ağacında versiyon geçmişine veya release'e girmemesi gereken araç/ortam dosyaları bulunuyor (.codegraph/, .cursor/, .superpowers/, EVENTRADAR_COMPLETE_PROMPTS.md, coverage.xml vb.). .gitignore ve katkıcı dokümanları bu sınırı açıkça tanımlamalı.

Acceptance criteria

• All listed workspace/tooling paths are present in .gitignore.
• git status on a clean checkout shows no untracked noise files.
• A brief note in README or CONTRIBUTING lists files that must not be committed (environment-specific artifacts, IDE configs, coverage reports).

Blocked by

None — can start immediately.