nx_mathspec_sinhcosh.nx

nx_mathspec_sinhcosh.nx -- SOVEREIGN SPEC EMITTER for the SINH/COSH kernels: every constant from the 120-bit bigfloat. No python, no minimax: exp-dd core reuses the POW families (ln2 32-bit hi/lo split, Bernoulli P_k = 2*B_2k/(2k)!) plus INV_LN2 for the reduction multiply; Taylor paths use exact factorial reciprocals 1/(2k+1)! (sinh) and 1/(2k)! (cosh), divided factor-by-factor under the bf_div_small bound. Layout: c[0]=one c[1]=half c[2]=two c[3]=INV_LN2 c[4]=ln2_h c[5]=ln2_l c[6..13]=P8..P1 (hi-first, signed) c[14..23]=sinh coeffs hi-first: 1/(2k+1)! k=10..1 c[24..33]=cosh coeffs hi-first: 1/(2k)! k=10..1 c[34]=28.0 (e^-2x sub-ulp cut) c[35]=711.0 (hard overflow cut) license_tier: ORIGINAL