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[ET-L2] ET-5: only 2 of the named grade disciplines have instances (affine, exact) #15

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@hyperpolymath

src/kernel/Anytype/Grade/ has Affine.idr + Exact.idr. The README's discipline table also names cost accounting, information flow, and composite (product) grades. systemet PR #17 now carries proven Lean statements to port: tropical Cost (min/+), the generic bounded-distributive-lattice⇒grade-algebra theorem instantiated at Level (Low≤High), and the componentwise product R × S (verification/proofs/lean4/Systemet/L2/Instances/). Cites: ET-5 (with ET-4 as the law set already discharged in Grade/Algebra.idr).

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