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Prepare native QCD trees with retained color and helicity amplitudes - #17
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Native process preparation currently accepts only singlet-scalar trees. This extends the same FeynKit path to massless Dirac quarks, adjoint vectors and singlet scalars, retaining complete complex color amplitudes instead of constructing a large symbolic squared norm.
The implementation reuses Idenso's typed color collector, the existing exact SU(3) network reducer, Spenso component contraction, and the native wavefunction/coefficient evaluators. It exposes helicity coefficients and caller-supplied external components for open spin contractions, and streams the physical helicity norm using the exact directed Gram matrix. ScalarTreeProgram remains a delegating entry point, including its saved norm instructions. Unsupported fields/tensors/poles fail explicitly; general Standard Model admission and one-loop finite remainders are outside this change.
Validation: all 74 combined native tests pass with PATH=/nonexistent. The 25 tree checks include five PDG channels at original and longitudinal/transverse-boosted momenta, all-helicity gluon Ward identities, exact color-charge/Casimir matrices, and an exact sub-binary64 coupling at 113/137/256/512/1024 working bits. Independent source review found no remaining actionable issue.
Stacked on codex/native-provider-integration at 72232a4, which integrates the previously published native preparation, color, precision, scalar-tree and scalar-loop changes. No dependency revision changes.