add CODEOWNERS for default review ownership

[atkrad]

Summary

• Add .github/CODEOWNERS with @atkrad as default owner for the whole tree.
• Prepares Scorecard Branch-Protection for "Require review from Code Owners" later (do not turn that toggle on yet while solo).

Ruleset follow-up (Settings → Rules → Protect main)

1. Require status checks to pass → add Unit Tests, Integration Tests, E2E Tests
2. Keep Require branches to be up to date before merging
3. Optional later: last-push approval / code owners / drop bypass (needs a second human)

Test plan

• CI green on the PR
• Finish ruleset save if not already saved
• Merge, then Scorecard re-run for Branch-Protection alert Review the code #1

Labels

• One of: kind/feature, kind/bug, kind/docs, kind/chore
• Add breaking-change if this breaks existing CLI or config behavior
• Add skip-changelog for internal-only PRs that should not appear in notes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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