nx_material_profile_test.nx

nx_material_profile_test.nx -- exercise the Generic PLA factory + validator on both the seed default and on hand-corrupted variants. Closed-form invariants: (a) Generic PLA factory returns non-null + validate == OK. (b) Material class == PLA, flow ratio == 1.0 (16384 in Q14). (c) Hotend temps: first-layer 215°C, print 210°C (5°C hotter first-layer is the documented adhesion-bias choice). (d) Bed temps: first-layer 65°C, print 60°C. (e) Print speed 150 mm/s, first-layer 50 mm/s, bridge 80 mm/s. (f) Bridge cooling: 100% fan during bridges (the 64.91%-sag- reduction lever from NCBI PMC12608786). (g) First N layers fan-disabled (default 1). (h) Retraction 0.8 mm (direct drive). (i) Validator catches: bad class, bad temp, bad speed, bad cooling, bad retract, bad advanced. expect_exit: 0 license_tier: ORIGINAL