nx_gtm_build.nx

nx_gtm_build.nx -- GO-TO-MARKET / BUILD PLAN. Turns the BOM's parts into an ORDERED assembly plan: the steps, durations, and precedence constraints (what must be done before what). Computes the build CRITICAL PATH -- the longest dependency chain, i.e. the minimum build time with unlimited parallel hands -- so the bottleneck is explicit and the parallel saving is quantified. (Named nx_gtm_build to avoid the existing nx_assembly CAD exploded-view engine + nx_build_plan printer scheduler.) INTEGER-EXACT. Durations in minutes. Step ids are in topological orde (every prerequisite has a lower id), so the earliest-finish of each step is a single forward pass: ef(i) = duration(i) + max(ef of its prerequisites). Instantiated for the water AWG bench prototype. THE exceed: the build schedule + its bottleneck are COMPUTED from the precedence DAG, not sketched -- the 4-hour enclosure print is the critical path, so it should be pre-printed or started first. grounded: critical_path_method + assembly_line_precedence + design_for_assembly genealogy_id: assembly_build_plan + nishi_go_to_market