The Zero-Point Emergent Gravity (ZEG) framework proposes that gravity and the cosmological constant emerge from quantum vacuum fluctuations in a dense superfluid of zero-point energy. Local gradients in vacuum density induce curvature via Sakharov-style loops, while uniform bulk density remains inert — a degravitation mechanism that suppresses the naive Planck-scale vacuum energy by the holographic factor: (ℓPl/RH)2≈10−122(\ell_{\text{Pl}}/R_H)^2 \approx 10^{-122}(\ell_{\text{Pl}}/R_H)^2 \approx 10^{-122} , yielding the observed Λ≈10−26\Lambda \approx 10^{-26}\Lambda \approx 10^{-26}kg/m³ without fine-tuning. The Hubble constant H0H_0H_0arises as the velocity gradient of the cosmic-scale vortex sustaining the observable universe, recovering the measured value (~73 km/s/Mpc) from vacuum dynamics alone. This model eliminates dark energy and dark matter as separate entities, deriving cosmic acceleration and structure formation from gradient-restricted fluctuations. The framework is falsifiable and offers a parsimonious alternative to $\Lambda$CDM patches.