Add cli/skill-reviewers as CODEOWNERS for skills packages

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: BagToad

.github/CODEOWNERS

@@ -13,3 +13,6 @@ pkg/cmd/release/shared/ @cli/package-security
 test/integration/attestation-cmd @cli/package-security
 
 pkg/cmd/attestation/verification/embed/tuf-repo.github.com/ @cli/tuf-root-reviewers
+
+pkg/cmd/skills/ @cli/skill-reviewers
+internal/skills/ @cli/skill-reviewers