Three Observational Falsification Tests of the Guerrero si-FDM Framework.

We present three independent observational falsification tests for the Guerrero self-interacting Fuzzy Dark Matter (si-FDM) framework ($m_{22}=8$, $\lambda=0.509$). Using Planck 2018, Pantheon+, and JWST data, we evaluate the Rigidity Filter’s predictions on ISW stacking, differential cosmic expansion, and high-redshift galaxy morphology. Results show that the framework is not only unrefuted by current data ($<3\sigma$ in all tests) but is statistically favored over $\Lambda$CDM in void-specific ISW measurements ($A_{ISW}=1.302$ at $+0.36\sigma$ for Guerrero vs $+1.75\sigma$ for $\Lambda$CDM). We also resolve apparent tensions in JWST kinematic data and provide definitive falsification criteria for future observatories like DESI, Euclid, and the ELT.