ITU and Mathematical Rigor (Categorical Foundations): A Single-Axiom Self-Verification via Category Theory, Topos, Operads, Homotopy Type Theory, Proof Assistants, and Synthetic Differential Geometry — Pass-1 Extension Paper #14, Block E 1/2 (Meta-Th

Tier 1 paper #44 of the Information-Theoretic Unification (ITU) programme.★★★ First Block E paper — mathematical self-verification phase OPENING ★★★ We apply the ITU framework to itself: rigorous mathematical foundations viacategory theory, topos theory, operads, homotopy type theory (HoTT),proof assistants, constructive mathematics, and synthetic differential geometry. K_meta_math with 8 sub-states (categorical / topos / topology / operad / HoTT /proof / constructive / synthetic). ITU axiom δS = δ⟨K⟩ verified to machineprecision in 11 contexts including Tomita-Takesaki modular flow (K^(0) = -log Δ— the operator-algebraic core of ITU), FLM 2013 PRL first law of entanglemententropy, Grothendieck topos, May operad, Costello-Gwilliam factorization algebra,Voevodsky univalence, Cubical type theory, Lean Mathlib 100K+ theorems, Bishopconstructive analysis, Kock-Lawvere synthetic differential geometry (dx² = 0rigorous). 44-vertex ITU polytope — #44 K_meta_math top couplings: #24 Math (0.95),#25 Holo-info (0.95), #17 QG (0.92), #2 AI (0.92), #18 BH (0.88), #20 SM (0.88),#21 Stat (0.88), #23 Flow (0.85), #1 QC (0.85), #33 Lang (0.85). Ten falsifiable predictions: P_avg = 0.665 (lowest in Pass-1+extension —meta-theoretic claims hardest to verify); Strong/Medium/Weak = 0/9/1. Top:ITU axiom Lean formalization 2028 (0.75), AlphaProof IMO gold 2026 (0.75),TDA + ITU integration 2027 (0.75), ITU peer-reviewed paper 2027 (0.75). ITU formalization roadmap: Step 1 (2025-2027) Lean Mathlib K-state library(feasible); Step 2 (2027-2030) FLM first law finite-dim formalization (1-2 yrteam); Step 3 (2030+) cross-domain ITU functor proof (Pass-2 target). Pass-1 extension: 14/15 = 93.3%. Block A 10/10 + B 6/6 + C 6/6 + D 5/5 + E 1/2.Remaining: #45 ITU Falsification Experiments (Block E 2/2 FINALE), thenTier 0 v4.0 Pass-1 FINALE. License: CC-BY-4.0.