Same as Figure 6, but for the full five-night dataset including 2025 December 27. Top: unweighted residual-variance period scan within 6.8–7.4 hr. Middle: fold at the four-night reference period P  =  7.142 hr, highlighting degraded stationarity introduced by the fifth night. Bottom: fold at the best k  =  1 period from the five-night scan, P  =  7.158 hr.