L-aspartate de novo and selected salvage routes to NAD+

A reusable, scope-limited route set for organisms that use the L-aspartate de novo pathway and/or selected nicotinate, nicotinamide, and NMN salvage alternatives. Every realization is end-to-end: NaMN made by L-aspartate de novo synthesis, PncB, or PncC must pass through deamido-NAD to NAD+, whereas NMN made by NAMPT must be adenylylated directly to NAD+. Alternative adenylyltransferase families and NAD synthetase nitrogen donors are modeled as variants. This is not a universal NAD+ biosynthesis hub: de novo synthesis through L-tryptophan and the kynurenine pathway is owned by the existing MODULE:kynurenine_nad_de_novo module and is not duplicated here. Nicotinate degradation, pyridine-nucleotide transhydrogenases, NAD kinase and NADP formation, NAD-consuming reactions, and unrelated aldehyde metabolism are outside the boundary.

The root requires one or more complete route classes; no empty realization is valid. All NaMN-producing alternatives are connected only to required NaMN adenylylation and deamido-NAD amidation, and NAMPT-produced NMN is connected only to required direct NMN adenylylation. PncA and PncC remain distinct: PncA deamidates nicotinamide to nicotinate, whereas PncC deamidates NMN to NaMN. The module deliberately ends at NAD+ and excludes kynurenine-route duplication, NADP formation, and NAD+ consumption. The KT2440-specific PP_3298 gap below is realization-level curation metadata; it neither changes the reusable route logic nor adds an obligatory family.