Why: The authoritative target advanced while this task recorded approved source and risk requirements.
Evidence: Documents HEAD merges both the task branch and incoming 46506aec34a8803d1b7f4de1a048de9dba591da2 pin; the staged superproject diff has no whitespace errors.
Impact: Include upstream task cards, Backend pin, governance changes, and this task Documents branch without rewriting approved records.
Refs: task-sync; stage 4 work observation review