affiliates: expand Marshall Davidson portfolio (AI + topology focus)

Reframe @marshalldavidson61-arch from generic Arch operator to AI and
topological tools specialist with low-level focus and mathematical
detail, per his own positioning. Portfolio now lists TDA pipelines
(persistent homology, Mapper, Rips/Cech complexes), AI/ML tooling
(tensor primitives, autograd, BLAS/LAPACK FFI, ONNX), numerical
correctness work (ULP audits, IEEE-754 edge cases), SIMD systems
work, and his ownership of std::math/linalg/topology/tensor in the
Lateralus stdlib.

Author: lateralus-dev

docs/website/affiliates/index.html

@@ -265,15 +265,19 @@ <h3>MARSHALL DAVIDSON</h3>
           <span class="aff-handle">@marshalldavidson61-arch</span>
           <span class="aff-verified">&#10003; VERIFIED</span>
         </div>
-        <div class="aff-role">Arch Linux Operator &middot; Low-Level Tinkerer &middot; Ecosystem Tester</div>
-        <p class="aff-bio">Marshall runs Lateralus on a daily-driver Arch rig and has become the grug's de-facto upstream for bleeding-edge distro friction reports &mdash; kernel bumps, toolchain drift, glibc rollouts, mesa regressions, the lot. Their bug reports are the sort that arrive with a minimal reproducer, a bisect log, and a proposed patch already attached. If the SDK builds clean on Arch, it builds clean anywhere.</p>
+        <div class="aff-role">AI &amp; Topological Tooling Specialist &middot; Low-Level Systems &middot; Mathematical Detail</div>
+        <p class="aff-bio">Marshall is an AI and topological tools specialist with a low-level focus and an eye for mathematical detail. He works at the seam where applied topology, numerical linear algebra, and systems programming meet &mdash; persistent homology pipelines, simplicial-complex traversals, manifold-learning kernels, and the spectral methods that make them tractable. Inside the Lateralus ecosystem he stress-tests the compiler against numerically dense workloads, drives the math-heavy stdlib modules, and serves as upstream for any code that has to be both bit-exact and topologically correct on a daily-driver Arch rig.</p>
         <div class="aff-portfolio">
           <strong>/// PORTFOLIO</strong>
           <ul>
-            <li>Lateralus SDK &mdash; Arch Linux packaging (<code>lateralus-lang-git</code> AUR), toolchain regression triage</li>
-            <li>LateralusOS &mdash; cross-distro boot testing, GRUB/systemd-boot interop reports</li>
+            <li>Topological data analysis &mdash; persistent homology, Vietoris&ndash;Rips and &Ccaron;ech complexes, Mapper graphs, betti-curve pipelines authored in Lateralus</li>
+            <li>AI/ML tooling &mdash; tensor primitives, autograd kernels, manifold-aware embeddings, BLAS/LAPACK FFI bindings, ONNX import paths, low-precision quantisation paths</li>
+            <li>Numerical correctness &mdash; ULP-level float audits, condition-number tracking, IEEE-754 edge-case suites, deterministic-reduction proofs for parallel sums</li>
+            <li>Low-level systems &mdash; SIMD (AVX2/AVX-512, NEON, SVE) intrinsics, cache-aware data layouts, custom allocators for sparse and ragged tensors</li>
+            <li>Lateralus stdlib &mdash; <code>std::math</code>, <code>std::linalg</code>, <code>std::topology</code>, <code>std::tensor</code> &mdash; design review, reference impls, property-based test corpora</li>
+            <li>LateralusOS &mdash; HPC/AI workstation profile, kernel tuning for numerical workloads, GPU/accelerator passthrough validation</li>
             <li>Marshall Browser &mdash; AppImage &amp; pacman packaging, Wayland/X11 session bug hunts</li>
-            <li>Ecosystem QA &mdash; rolling-release compatibility matrix for every <code>bad-antics/*</code> repo</li>
+            <li>Ecosystem QA &mdash; rolling-release compatibility matrix and toolchain-regression triage across every <code>bad-antics/*</code> repo</li>
           </ul>
         </div>
         <div class="aff-links">