A System-Independent Digital Root Fingerprint in the Quran: Evidence from Fifteen Computational Experiments across Two Languages

v3 — adds Experiments 14-15. Exp 14 (Random Encoding Stress Test): 33 random encodings tested. 0/33 beat Special-6 (p < 0. 007). Mean 3, 6, 9 = 31. 3% (below chance). The fingerprint is NOT an artifact of arbitrary encoding. Exp 15 (Frequency Order Encoding — System 3): Third independent encoding based on inverse frequency weighting. Surah-level 3, 6, 9 = 21. 9% (not significant). But transformation map reveals 5 self-preserving roots 1, 2, 6, 7, 9 (p = 0. 0015). Each encoding system reveals a different structural layer of the text. Unified preprint: 15 experiments, 3 encoding systems, 5 control texts, 2 languages. The Quran carries a multi-layered digital root structure absent in all controls.