SEDE: Structural Entropy Dark Energy — reproduction code and pipeline

Code, data vectors, and the analysis pipeline that reproduce the results and figures of the paper "Structural Entropy Dark Energy: a fixed-parameter, growth-gated holographic dark-energy model without a cosmological constant." A single entry point (reproduce_all.py) regenerates every number and figure; the model and likelihood live in the sede/ package, and a verification suite checks the quoted results numerically. SEDE is a cosmological-constant-free dark-energy model in which dark energy is the thermodynamic conjugate of the cosmic apparent-horizon entropy, gated by a structure-growth factor.