nx_twinfit.nx

nx_twinfit.nx -- aesthetictwin AT34 (2026-09-17): THE TWIN LOOP'S FIRST RUNG, the reachable axis envelope. The photo ruler (nx_photomark_lib) reads a reference still and the estate's own face render through one instrument; this organ asks the question the fit loop stands on: over the morph basis the generator exposes today (nx_faceanat canon face + the seven persongen morphs), which of the card's scale-free axes can a render REACH at all? Each gene is swept to its declared floor, middle and ceiling with the others at middle (nx_twinfit_lib does the build, render and in-process measurement); per axis the min and max over the sweep is the envelope, and a target read from a file (rows axis|<name>|<value>|<err>) is REACHABLE when its error band meets the envelope, else UNREACHABLE -- which names the morph the generator is missing (the build order for AT29), never a fit that quietly stops short. nx_twinfit envelope [target-file] [skin_r skin_g skin_b] -> one row per render, one row per axis, a summary whose partition sums nx_twinfit axes <w> <l> <j> <e> <p> <n> <c> [skin_r skin_g skin_b] -> one render at those seven percents, its axes nx_twinfit truthref [seed_hi] [seed_lo] [sweep 1|0] -> AT39: the ruler judged per canthus against the render's own landmark truth (the 21-cell gene sweep, then persongen seeds 1..n), signed bias per landmark, a partition that sums; AT44: a TRUTHLIP line per render judging the ruler's five mouth landmarks against the lip unit's stated truth, with the mouth's own partition nx_twinfit fit <target-file> -> AT40: solve the seven morphs and six eye genes against a card's axes from the STATED landmarks (no render), name genes at a range limit, confirm on the surface nx_twinfit truth <w> <l> <j> <e> <p> <n> <c> -> AT39: no render; the built face is asked where its canthi are (reasons by name, model units, projected deci-pixels, asymmetry) The skin tone defaults to persongen's fair-medium family; passing one moves the render's albedo while the geometry stays, which is how the ruler's tone sensitivity on renders is measured rather than guessed. exit: 0 every render measured | 1 some render UNMEASURED (envelope partial, said so) | 2 usage | 3 cascades not loaded license_tier: ORIGINAL No hw writes (Rule 26).