Add four-point Kronecker multiplication - #9606
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Cost model: KS2 performs two packed integer multiplications at roughly half the KS1 bit width, plus linear packing, signed recovery, and interleaving. Slot width derives from min(size) * maxAbs(p) * maxAbs(q). The crossover sweep keeps this as a forced kernel because it rarely beats the existing KS1 implementation on the current grid.
# Conflicts: # scripts/bench/proof_only_runtime_exemptions.json
# Conflicts: # scripts/bench/proof_only_runtime_exemptions.json
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Implements the SPEC KS4 kernel in
HexPolyZ:kronecker4_identityandmulKronecker4_eqwithout axioms or sorriesThe restored 276-cell sweep found KS4 slower than KS1 in every stable cell (3.09x median, 1.95x best). KS4 therefore remains a forced kernel and production dispatch is unchanged. The factorization runtime-freshness exemption records that exact fact.
Depends on #9605 (and transitively #9602). This targets upstream
mainper repository convention and includes the stacked base until those PRs merge.