For each prime $p$, let $c(p)=\frac{\varphi(p-1)}{p-1}\prod_{j\ge1}(1-p^{-j})$, the limiting probability, as $n\to\infty$, that a uniformly chosen matrix in $M_n(\mathbb{F}_p)$ has primitive-root determinant. As $p$ ranges over the primes, $c(p)$ has the classical shifted-totient limiting law $μ_G$ on $[0,1/2]$. Let $μ_f$ be its image under $x\mapsto-\log x$. We prove that $μ_G$ has Hausdorff dimension zero and gives full mass to absolutely normal Liouville numbers. Every Borel set of positive $μ_G$-mass has packing dimension at least $1/2$, and local dimension fails to exist $μ_G$-almost everywhere. Both Fourier transforms satisfy the effective bound $O((\log|τ|)^{-1/3}(\log\log|τ|)^{1/3})$. In every fixed reduced progression, the empirical laws of $c(p)$ and $\varphi(p-1)/(p-1)$ approach their respective limiting laws with sharp Kolmogorov order $1/\log x$. Over unrestricted primes, these laws and their negative-logarithmic images converge in $W_1$ at rate $O_B((\log x)^{-B})$ for every fixed $B>0$. We obtain concentration expansions to every fixed inverse-logarithmic order and prove that every sufficiently short maximizing interval for $μ_f$ contains $\log3$. For $U_T$ uniform on $[0,T]$, $(\log T)\widehat{μ_f}(U_T)$ converges in distribution to a circularly symmetric random variable whose modulus is an explicit random Euler product, with convergence of absolute moments of every real order $s>-1$. For every $A>0$, the strongly additive function $f_A$ with prime values $(\log\ell)^{-A}$ has absolutely continuous limiting laws for $f_A(n)$ and $f_A(p-1)$. We give extremal estimates and certified NTT prime searches. A lattice supplement determines second distinct nonzero squared norms of type-$A$ tensor products and gives uniform cyclotomic smoothing asymptotics at $ε=2^{-c\varphi(m)}$ for every fixed $c>0$. These statements are unconditional.

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