nx_build_plan_sim.nx

nx_build_plan_sim.nx -- simulator for the multi-process build plan. ===================================================================== CARDINAL: [[feedback-simulation-discipline-for-every-substrate]] Second-substrate demonstration of the simulation discipline. First stone was nx_print_sim (3d-print physics). THIS file applies the same SimulatorState + step + sealed-enum issue framework to a completely different substrate (multi-process schedule solver) -- proving the discipline generalizes. Industry: there is no production cross-process build-plan scheduler at all (humans + spreadsheets coordinate today), let alone a simulator that predicts schedule failures. What this simulator predicts on a SOLVED build plan: DEADLINE_MISSED total schedule > caller-supplied deadline POST_CURE_OVERRUN any part's post-cure > caller max PRINTER_IDLE_WASTE one process's printer idle most of its used window (heuristic candidate -- queued per the cardinal's no-heuristic rule) FIRST STONE here ships the first two (real time-arithmetic, not heuristic). PRINTER_IDLE_WASTE deferred until we have a clearer physical definition. ===================================================================== license_tier: ORIGINAL