Agent 6 applied SW-pin fix and marked verified via element state
(currentTime advancing, videoWidth=1920, readyState=4). Headless pixel
histogram still showed darkPct=100% — element decoded fine but CSS
overlay covered it.
Real cause: branding.xml BLACK-PASS paints .libraryPage with
#000 !important. Jellyfin OSD page renders <div id=videoOsdPage
class=libraryPage>; class match -> opaque black div above <video>.
Fix: extend transparent-scope using :has(.htmlVideoPlayer) +
#videoOsdPage selector. Post-fix darkPct=9.8% (was 100%), MNS S1E4
video frame visually paints.
Removed INC6 clear-cache-only middleware (no longer needed, was
burning HTTP cache every visit).
bin/apply-26-incident-fixes.sh extended with INC7 patch (idempotent
re-apply if branding.xml ever drifts back).
Lesson: video-element state alone is insufficient verification.
Always sample pixel histogram + canvas drawImage on the painted
viewport.
s8n
d0e7af3099