CLAUDE.md: status to V1.2.1 / 2026-09-08; the BER paragraph now says Script A takes a baseline as well as Script C taking the closing sweep; and a new gotcha that 'clear' is what puts the lanes back, with the Script A versus Script C traffic reports as the way to tell whether they came back in time. ARCHITECTURE.md: Script A ref to V1.2.1 and its row updated with the baseline sweep; the BER row notes both call sites; the sleep 30 / BER_INTERVAL known issue now says three places rather than two; a new known issue for the missing settle between Script A's BER clear and its first traffic run; and the git tag checkbox to V1.2.1. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014RetWKFZFG1ZHcitQAyhwM