[tabedzki]

Summary

Add .github/CODEOWNERS so the stated people get tagged through automatic review requests when their respective files change in pull requests:

Backend logic, related tests/data, documentation → @m-beau
GUI and GUI tests                              → @tabedzki + @m-beau
Deployment, operations, and all remaining files → @tabedzki

Documentation build configuration stays with @tabedzki. GitHub applies these rules once this file is present on the pull request's base branch; owners must have repository write access.

Evidence

• Before: No CODEOWNERS file, so these file ownership rules did not request reviews automatically.
  After: Validated eight representative ownership cases, including shared GUI ownership and deployment/backend/documentation routing. All 250 tracked files resolve to an owner. git diff --cached --check passed before committing.

Merge Danger

Door: two-way

Revert or edit CODEOWNERS to change review routing.

Blast Radius: reviews

Changes automatic reviewer selection; application behavior is unchanged.