Token rotation Phase 1-3 (partial), a real dual-token bug found and fixed across 79 files, a genuine unauthenticated file-read security gap found and fixed in file-editor.php, SOP-USERPREFS.md written, egress congestion escalated to Server. Old token still active (dual-valid), not retired -- waiting on USR369 confirmation.

Phase 1: built backend/config/auth-lib.php+tokens.json, locked down. Phase 2: migrated 91 files off hardcoded token across systems/commands/, backend/, systems/*/data/api.php, core endpoints. Found/fixed dead platform.php and an unrelated tasks-api.php SQL bug. Wrote SOP-USERPREFS.md. Escalated egress congestion to Server[40]. Phase 3: added new token as dual-valid, found and fixed a real bug where 79 files only validated against the first token in the array, found and fixed a genuine pre-existing unauthenticated file-read gap in file-editor.php. Caught up media-db research log retroactively. Fully wrote up handoff-10.md, LEGACY-10.md, todo-10.md for a clean handoff to tomorrow.