Update C88a chronology and reference for H₁ ≤ 240 - #167
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This PR updates the historical record for the bound (H_1 \le 240) on the bounded prime gap constant (C_{88a}).
A preprint by Hanxin Zhang establishing (H_1 \le 240) was publicly deposited on Zenodo on 28 August 2026:
Julia Stadlmann's independent preprint establishing the same bound was subsequently posted on arXiv on 31 August 2026:
The proposed change retains both results and records them in chronological order. It does not change the current best upper bound of 240.
The Zhang manuscript and supporting materials were prepared with substantial assistance from GPT-5.6 Sol. I have personally reviewed the dates, references, and information included in this PR.