Covariant reformulation of relativity with dynamic time as a field and emergent light speed. Proposes two-metric geometry (gravitational + causal), synchronization holonomy as key observable, and falsifiable experimental tests. Addresses cosmological tensions while preserving local Lorentz invariance.

A Monte Carlo simulation in Python to model vacuum-induced frequency drifts in atomic clocks, with code and visuals (experimental setup, simulated vs. real-world comparison, and drift graph), as described in "Probing Vacuum-Induced Clock Drifts via Quantum Metrology: A Testable Hypothesis" (DOI: 10.5281/zenodo.15163879). Licensed under GPL 3.0.