T2523 (rotation) completed fully -- extended to session-log.md, ran live on 3 systems, wired into CLOSE.php. Then USR369 reported dashboard.html is 0 bytes -- confirmed, unresolved, filed urgent to Server/CC.

ROTATE.php extended to handle session-log.md (opposite ordering from LEGACY, verified against real data before trusting). Ran live on Master/Builder/Server session-logs. Added first FIX-LOG.md entry per new platform requirement, confirmed real append mode works (file_write_web.php v1.2). Diagnosed dashboard.html zero-byte issue -- confirmed two ways, checked for file-level backup (none found), attempted snapshot inspection (no capability), filed T-DASHBOARD-EMPTY urgent and broadcast to all systems including CC at decade 100.