The Modal Triplet Theory Program B3: Quantization as Discrete Constraint Encoding

We show that quantization arises as a necessary encoding class once reduced descriptions encounter nil obstructions, corresponding to termination of admissible describability. Nil obstructions force collapse of continuous descriptive degrees of freedom and select discrete survivors stable under admissible refinement. We define a discrete constraint encoding that organizes these survivors and prove that it is the unique admissible resolution of nil. Quantization is not introduced as a postulate, correspondence principle, or operator rule, but as a structural constraint on what descriptions remain admissible. Topological and combinatorial invariants play the central organizing role, while probability appears only conditionally when invariant measures exist.