The work outlines a top‑down computational framework that connects a high‑symmetry ⊇ E8 structure to 3+1D observables via an operational projection Π.

Instead of ad‑hoc effective shifts, the goal is to trace predictions back to explicit representation content and symmetry selection rules.

- Proton decay: A spectrum‑driven “Track A” scan identifies a golden point configuration yielding τ_p ≈ 1.22×10⁴¹ years (for p → e⁺π⁰) while keeping the α₃ mismatch at the unification scale below 2.7% (1‑loop piecewise running). - Dark photon: The model predicts a light dark‑photon region m_A' ∼ 10⁻⁴–1 eV, ε ≳ 10⁻⁸, illustrated against an order‑of‑magnitude IAXO‑like reach. - Framework: The paper details the E8 → A7 × U(1)' → SU(5) → SM breaking channel and the subsequent embedding into the Standard Model.

The full pipeline (45 steps implemented in Python) and the YAML configurations used to generate these artifacts are open‑sourced for reproducibility. Dev diary https://codeberg.org/Envoy/E8Quantum/src/branch/main/docs/_4...

Paper & code: https://doi.org/10.5281/zenodo.18797078 https://doi.org/10.5281/zenodo.18790530 https://codeberg.org/Envoy/E8Quantum