Add citation in README and fix edge cases for t=0

This incremental patch release adds a clear and specific (arXiv hyperlink) reference to the relevant report from Quantinuum that indirectly inspired our TFIM heuristics, during experimental recreation in simulo. We also analytically insert the correct behavior for TFIM when t=0, which is the only discontinuous point (or rounding neighborhood) for which the heuristic seems to fail, but the behavior there is always known analytically without significant computational overhead and can always be inserted by hand without discontinuity.

Full Changelog: v9.7.2...v9.7.3

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