Caught and fixed a real live bug Admin[00] traced to yesterday's SYNC v2.6 work (T00-DASHREOPEN), fixed the incident that ate LEGACY-10.md's history (T765, real append mode + shrink-guard), and walked USR369 through a live external task (X-plore Google Drive OAuth setup, T416) end to end, confirmed working.

1) Session-open orientation: closed 2 stale tasks (T00-SYNCBUG/407, T763) that were genuinely fixed yesterday but never formally closed in the task queue -- pure bookkeeping catch-up. 2) T00-DASHREOPEN fixed -- Admin[00] found Travel[95]'s registry reopening with stale five_checks_at, traced it (with a correction) to SYNC.php. Re-read my own live code line-by-line rather than assume: the v2.6 checkpoint-write feature itself never touches status. Real cause was a separate, pre-existing dashboard-ping block (runs on every SYNC call, unrelated to checkpoint params) that overrode DASHBOARD.php's own already-correct preserve-status logic by always sending an explicit status value. Fixed by omitting it. Verified live: SYNC call against a closed system, status/locked/five_checks_at all unchanged before and after. Also spotted (not fixed) a duplicate result_json array key in the same block -- inert for this bug, flagged as follow-up. 3) T416 -- walked USR369 through creating a Google Cloud OAuth client for X-plore (their built-in Drive login had died) across many screenshots in real time: consent screen setup, the new Google Auth Platform UI layout, catching a wrong-credential-type mistake (API key instead of OAuth client), Internal vs External audience given Workspace, client secret handling, and confirming the wrong/old JSON file before finding the right one. USR369 confirmed both ends working (old login genuinely blocked, new one connected). Closed. 4) T765 fixed -- file_write_web.php v1.2, the tool that caused K282-class LEGACY-10.md history loss on 08/09. Added a REAL mode=append (reads-then-concatenates) plus a shrink-guard on LEGACY-*.md and handoff-*.md (blocks a shrinking overwrite unless overwrite_confirm=1 is explicit). This is the tool nearly everything deploys through, including itself -- backed up, diffed, deployed via the still-live old version, then ran 4 live tests (backward compat, real append, guard blocking with content-integrity recheck, explicit override) before trusting it further this session. 5) Flagged (not resolved): 7 messages from Master arrived empty again (same body-vs-content param bug as yesterday, recurring) -- one needs real action from me (Build Diary backfill) that I can't do without content. Left genuinely unresolved rather than guessing, asked for proper resend.