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Support the helical source on the local propagator solver #139

Description

@krystophny

General three-dimensional geometry requires local propagator composition, while the periodic Arnoldi solver is restricted to its tested global route. Port the existing canonical complex helical source construction to the supported mode-1 local solver without duplicating its Runge-Kutta source stencil.

Requirements:

  • keep exp(+i(m theta + n phi)) and use explicit source-only m_phi_input;
  • preserve the corrugation sigma-odd and electrostatic sigma-even moment mappings;
  • inject the real physical-space projection into the real mode-1 right-hand side;
  • retain the local kinetic operator, discretization, collision moments, transfer matrices, convergence criteria, ABI, and memory layout;
  • support real and imaginary input quadratures for later complex-response reconstruction;
  • complete a trapped, bounds-checked HELCORE (m,n)=(1,-1) final join with finite transport and no IEEE marker.

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