spec: Recursion

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Codex Code Review

• Medium — Recursive verification omits the required commitment (spec/recursion.typ:105). verify accepts a commitmentSpace, but the recursive branch treats commitment_1 as a function; lines 116–118 similarly pass verifier functions directly. Use an explicitly defined specialization operation producing comm(verify'(commitment_0, commitment_1, ·)). As written, the equations are ill-typed and do not establish the claimed recursive chain.