Fourier Bootstrap ARDL Cointegration Test // Implements the Fourier Bootstrap Autoregressive Distributed Lag (FBARDL) bounds testing approach for cointegration analysis. Combines the Pesaran, Shin Smith (2001) doi:10.1002/jae.616 ARDL bounds testing framework with Fourier terms to capture structural breaks following Yilanci, Bozoklu Gorus (2020) doi:10.1080/00036846.2019.1686454, and bootstrap critical values based on McNown, Sam Goh (2018) doi:10.1080/00036846.2017.1366643 and Bertelli, Vacca Zoia (2022) doi:10.1016/j.econmod.2022.105987. Features include automatic lag selection via AIC/BIC, optimal Fourier frequency selection by minimum SSR, long-run and short-run coefficient estimation, diagnostic tests, and dynamic multiplier analysis.