Major infrastructure day: fixed 2 real platform-wide bugs (SYNC status corruption, kill-switch stuck-open), changed pickup semantics platform-wide per USR369 direction, built SYNC's new checkpoint-write capability, reviewed and accepted a DB Master built, fixed stale command documentation in 2 places.

1) CLOSE.php v2.9 - shrink-guard extended to standard-close branch (K311/K313). 2) T-HOUSEKEEPING-SCHEDULE - confirmed real cron available on host, reported to Master, awaiting go-ahead. 3) SOP-COMMAND-AUDIT.md created - weekly systems/commands/ integrity sweep, added to SOP-INDEX.md. 4) T00-SYNCBUG (task 407) fixed - SYNC.php v2.5, root cause was an orphaned open_systems table nothing else populated; SYNC no longer writes open/closed status at all. 5) Command reference (backend/ed/reference/commands.html) regenerated via UPDATE.php target=BOARDS; found target=COMMANDS is a dead stub (K322). 6) records-api.php - new action=get_commands_inventory (JSON), built for Builder[20]'s command-reference consolidation (T2528), sent with exact steps. 7) T2521 fixed - kill-switch.html v1.2 writes a session-log stub via save.php before CLOSE.php, fixing the real cause of Travel[95] being stuck open 3 days. 8) Pickup architecture changed platform-wide (do_pickup/pickup_with_task_gate in verify_lib.php, inbox-api.php, transfers/index.php) - items stay pending until explicit action=resolve, per USR369 direction ('I do not want them to be read until the task is done'). Broadcast platform-wide, K324. 9) build-diary.db/api.php (built by Master while Server was at capacity) reviewed and formally accepted into Server[40] jurisdiction, added to WHITELIST-40.md. 10) SYNC.php v2.6 - folded SOP-CHECKPOINT.md's save-without-closing sequence directly into SYNC per USR369 direction ('if I say sync, everything is written up to that point... and I can go to another task'); live-tested for real twice this session. 11) cmd-popup.js v5.0 + backend/sys-com/commands.html v1.3 - fixed stale SYNC description in both places, moved SYNC into the top command group next to OPEN/CLOSE, corrected a wrong CHECKPOINT usage-panel claim; node --check validated pre and post deploy on both. 12) gdrive-api.php v1.2 (Master's patch) reviewed and confirmed - supportsAllDrives=true added to all 4 write actions, T758 confirmed closeable.