nx_maint_simloop.nx

nx_maint_simloop.nx -- the CLOSED-LOOP DIGITAL-TWIN SIMULATOR + learning loop. Proves the whole maintenance platform IN SOFTWARE, reproducibly, with NO IRL spend -- the operator's real goal: simulate first, prove via modeling, then (optionally) validate on hardware. Operator (2026-06-23): "use software to simulate these things ... most systems have an emission loop ... we want a full learning loop ... a good example is OBD [which] just tells you errors but then you need 3rd parties to make the data meaningful, actionable, reproducible." Grounded in the sovereign research (knowledge/fetched/maint_*: digital_twin, control_loop, feedback, predictive_ maintenance, prognostics, on-board_diagnostics): S-class CLOSES the loop with a digital twin + feedback control; OBD is OPEN-loop. THE LOOP (per cycle): twin wears -> generate a sensor reading -> run the REAL pipeline (nx_hvac_analyze_core -> nx_maint_severity -> nx_plan_for) -> CLOSE THE LOOP: a fix/replace action feeds back and RESETS the wear -> the next cycle SELF-VERIFIES the asset recovered. Open-loop (no feedback) just degrades and stays broken (OBD); the closed loop self-maintains = the measured EXCEED. NEVER-BRICK (#26): pure simulation; no syscalls, no device writes. genealogy_id: project-maintenance-platform-sclass-2026-06-23 (closed-loop sim; researcher-grounded) license_tier: ORIGINAL