Builder [02] final close 08/05-06/26 -- T716/T572/T571 closed, decade-suffix standardization confirmed correct, T2511/T496 escalated

Closed T716 (kill-switch.html now drops close report to Master), T572 (built CLEAN-REG.md browsable page), T571 (built BACKUP-REG.md browsable page with search). Found and flagged a platform-wide add_decision HTTP 500 bug -- Server[40] fixed it across 9 of 11 systems same day. Standardized Builder's gov files to decade suffix (handoff-20.md/todo-20.md canonical), confirmed correct against Master/Server's independent platform-wide migration (broadcast 43). Escalated T2511 (lightbox photo editor, location genuinely unknown after exhaustive search) and T496 (DB schema task, jurisdiction conflict) -- both parked pending direction, not abandoned. Filed T-PAGE-AUDIT for the page-inventory.html/site-index.html registration gap found mid-session. Corrected a self-caught mistake earlier in the session (HANDOFF.php test call had overwritten the live handoff file).