Add dns-internal-resolution (L2 behavioral): an in-cluster Job resolves
keycloak.home.keithjackson.dev via the default cluster resolver and asserts the answer
is the in-cluster Gateway VIP (10.73.0.24x), not a public/off-cluster hairpin. Complements
dns-exposure (R-DNS-02, external record). coverage.py now maps R-DNS-01/R-DNS-03 to this
test (covered); chainsaw v0.2.12 lint clean; strict hygiene gate green.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
