nx_sim_credibility_gate.nx

nx_sim_credibility_gate.nx -- the S-class roadmap, organ-graded (operator: "make sure our SIMULATION is S-class exceed and that governments would approve of it -- NASA jet labs, medical devices -- truly S-class"). A simulation is "approvable" only against a real MODEL-&-SIMULATION CREDIBILITY framework. This census grades our sim engine on the NASA-STD-7009 eight credibility factors (Verification, Validation, Input Pedigree, Results Uncertainty, Results Robustness, Use History, M&S Management, People Qualifications) + the risk-informed credibility goal from ASME V&V 40 / FDA CM&S guidance + Reproducibility + Software Quality/Lifecycle (IEC 62304 / NASA NPR 7150.2 / DO-178C). Each axis 0..4 (ABSENT/PARTIAL/BASIC/CREDIBLE/EXCEEDS). Per NASA-STD-7009 the OVERALL credibility is gated by the WEAKEST factor (min), assessed against stated requirements. DOCTRINE (charter + feedback-no-wave-measured-exceed): S-class = MEASURED + ORGAN-GRADED on a maturity ladder, NEVER self-scored; the rubric must REJECT an unbacked high grade (liar-kill). HONEST HEADLINE: our overall credibility today = LEVEL 0 (real strengths in pedigree + reproducibility, but validation/UQ/risk-framework ABSENT) -- a strong sovereign FOUNDATION, nowhere near flight/clinical approval. GREEN = the census is complete, honest, and overclaim-proof (NOT "we are approved"). GREEN iff 6/6. license_tier: ORIGINAL