nx_eline_gate.nx

nx_eline_gate.nx -- GATE for aesthetictwin rung AT15: the RICKETTS E-LINE profile ruler. CORRECTED: this shipped labelled AT5 for one session, and AT5 is the NEOTENY axis on that board. The rung is AT15 and its row was written into aesthetictwin.plan after the fact. Recording the mislabel rather than quietly renumbering, because a number that moved without explanation costs the next reader the whole reconciliation. WHY THIS RUNG EXISTS. The face was judged "not there" by the operator and the honest first answer was that I had no external ruler for a PROFILE at all -- only my own eye, which the standing rule grades as an interpretation and never as a shipping justification. Ricketts' esthetic plane is a published norm: a line from pronasale to soft-tissue pogonion, with both vermilions sitting BEHIND it in a balanced adult face. That turns "the face looks wrong" into two signed numbers against a bar nobody in this estate gets to choose. THE PAIR T4/T5 IS THE LOAD-BEARING PART AND THEY TEST DIFFERENT TERMS. An offset from a LINE has two endpoints and a subject; a ruler that had quietly degenerated into "how deep is the lip" would still move when the lip moves, so T4 alone cannot tell a line from a depth. T5 leaves the lips untouched and advances the CHIN, which changes only the baseline -- and the measured lip protrusion must fall anyway, because the line rotated forward underneath it. Only both together prove a line was used. T6 is a REACHABLE negative control, not decoration: shrunk to a tenth the face no longer reaches the pogonion band, and the ruler must refuse BY NAME rather than return the most flattering reading available. A measure that answered anyway would be reading its own parameters back out.