feat: generalize lcAt_openRec_iff_lcAt - #833
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Generalized the theorem `lcAt_openRec_fvar_iff_lcAt` → `lcAt_openRec_iff_lcAt` It now works for opening with an arbitrary term N (that is itself LcAt i), not just a free variable fvar x.
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Generalized the theorem
lcAt_openRec_fvar_iff_lcAt→lcAt_openRec_iff_lcAtIt now works for opening with an arbitrary term N (that is itself LcAt i), not just a free variable fvar x.