Why: Backend #171 HEAD advanced with must_change e2e fix; keep Dev gitlink in sync and mark U4 specs started. Evidence: Backend go test store/server/app green at 47463a9 Impact: Dev U4 branch tracks Backend PR #171 tip. Refs: docs/svc-deploy/u4-one-time-login-key.md; Backend pulls/171 Co-authored-by: Cursor <cursoragent@cursor.com>
ui
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