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test(utility): generic ADL fma-accumulation kernel + fma parity audit (#1199) (#1240)

Add a single generic kernel -- dot_fma(x,y) using the ADL two-step
`using std::fma; acc = fma(x[i], y[i], acc)` -- and instantiate it over the native
floating-point types (std::fma) and every Universal number type that provides a free
fma (posit, cfloat, integer, fixpnt, bfloat16, dd, qd, areal, takum). This proves the
per-type fma overloads are uniformly ADL-reachable, which is what lets a mixed-precision
kernel be written once and run over any arithmetic type. Green on gcc + clang.

Re-scope note (#1204): the original issue asked to route the generic BLAS dot through
fma, but the BLAS was extracted out of Universal (include/sw/blas is gone). Universal is
now number-systems-only, so the *library* generic-dot fma-accumulation path belongs in
MTL5 / mp-blas -- selected there via the has_fma<T> trait added in #1198 -- not in
Universal. This commit delivers the Universal-side pieces: the generic instantiation test
(above) that keeps the overloads ADL-reachable, complementing the has_fma trait.

fma parity audit (existing overloads): all share the signature `T fma(const T&, const T&,
const T&)` returning the type by value -- posit (atomic_fused_operators.hpp), cfloat, dd,
efloat, ereal. constexpr where feasible (dd, efloat); posit/ereal are not constexpr
(convert()/blocktriple and elastic-limb allocation preclude it). Signatures are
consistent; no changes needed.

Resolves #1199
Relates to #1189

46907 of 54872 relevant lines covered (85.48%)

6795321.82 hits per line

Coverage Regressions

Lines Coverage ∆ File
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1 30380503472.1 644
85.48
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