README: observables as in arXiv:2607.08505, autocorrelation table, citation

#2
phi4-generative org

Observables follow arXiv:2607.08505 Sec. IV.A, i.e. <|phibar|>, chi = V(<phibar^2> - <|phibar|>^2), U_L, kappa_2^(site) and /V. xi_2 and F are removed. An autocorrelation table precedes the observables and the BibTeX reference closes the card. Supersedes PR #1.

YangyangTan changed pull request status to merged

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