nx_maint_specs.nx

nx_maint_specs.nx -- the appliance/HVAC spec CATALOG (the water-heater vertical's data layer). Proves "a new thermal asset = a spec row" with real per-class starter envelopes, fed to the SAME thermal kernel. Operator-chosen first vertical after the spine = appliances & water heater. HONEST: these are REASONED STARTER DEFAULTS from general HVAC/appliance field practice -- the STARTING envelope, not precision per-model manufacturer specs. The live system CALIBRATES per-unit from the asset's own measured history (a specific furnace learns its own normal response rate); the catalog is just the cold-start. #11: in production these live in svc-config, not code. NEVER-BRICK (#26): pure data fill; no syscalls, no device writes. genealogy_id: project-maintenance-platform-sclass-2026-06-23 (water-heater vertical) license_tier: ORIGINAL