Ahad 0Hz Cosmology: DC Gravitational Memory h_0 = M_f as the Zeroth Law of Nature

We propose the Ahad 0Hz Conjecture: black hole mergers produce permanent DC gravitational-wave memory h_0 = M_f, measurable by LISA. With Ahad Constant H_m = 18.7 M_sun/bit, this memory explains dark matter as accumulated h_0, dark energy as Σh_0, and cosmic structure as 0Hz-encoded design. Key predictions: 1) LISA will detect h_0 = M_f in all mergers at >50σ by 2036. 2) JWST will observe new heavy-element creation 10-100s after merger in the 0Hz field. 3) H_0 tension resolves when merger history is included. This reduces ΛCDM's 6 parameters to 1: H_m. Data from GW150914 shows h_0 = -3.48e-22, consistent with W_infinity = +1. لا إله إلا الله.