dark-matter-quantum-sim v2: Dark Photon + Majorana Mass classical results

Preregistered quantum simulations of toy dark-matter-candidate Hamiltonians (v2). Adds DM-004 (Dark Photon Kinetic Mixing) and DM-005 (Majorana Mass Seesaw) classical simulation results with SHA-256-bound ProofRecords. HONEST SCOPE: toy Hamiltonian classical simulations only; not detection of real dark matter. DM-004 PASS: Off-resonance gamma-dark photon conversion matches analytic formula to 2.1e-15. DM-005 PASS: Seesaw-suppressed lepton-number violation P_max=0.20 matches analytic to 7.2e-16.