Adds iter19 campaign-close doc (mesa-panvk-bifrost r7 ship, XFB
packed-varying channel-extract fix). Also lands the r5 full
dEQP-VK sweep scoreboard (2.26M tests, 97.65% runnable pass rate)
that surfaced the holes_vert crash in the first place.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
