nx_cdmap_referee_lib.nx

nx_cdmap_referee_lib.nx -- THE SECOND RULER for the position map (datavis DV2a, 2026-09-15): re-derives the readability grade of an EMITTED cdmap figure from the published SVG alone, then re-measures every label with REAL TrueType advances (nx_ttf_fontlib over a real sans face -- Liberation Sans, SIL-OFL data under knowledge/fonts/) in place of the emitter's 560-permil-em estimate, and runs the same critic (nx_chartlay_lib cl_critic) over both. The emitter's self-grade (api.json readability_cut) is a CLAIM; this lib is the independent method class that can refute it: the heuristic critic must REPRODUCE the published grade from the SVG (else the page and its api.json disagree), and the metric critic says whether real glyph widths would have produced overlaps the estimate hid. It is NOT the browser-pixel referee (DV2, crg_judge): the viewer's font is unknown to us and Liberation Sans is a stand-in of the same class; a browser render judged on pixels stays the contracted rung above this one and is not claimed here. Scope stated: label boxes keep the emitter's 1.25-em height so the ONE variable under test is width; kerning is not applied (a sum of hmtx advances is the width the emitter would need to reserve); entity bytes in a label (a rare &) are measured as their literal characters. license_tier: ORIGINAL