release(v1.1.0): additive CPU-only generic numerical primitives

Adds 9 new top-level / sub-modules to the Rust API only (no Python
bindings yet), with at least one analytic unit test per module.

New Rust modules:
- optimal_control::matrix_riccati  (RK4 backward solver)
- timeseries_utils::nonsync_covariance  (Hayashi-Yoshida)
- timeseries_utils::wavelet  (Haar / Daubechies DWT and MODWT)
- risk_measures  (VaR, CVaR, projected sub-gradient CVaR minimisation)
- graph::laplacian + graph::spectral_clustering  (Jacobi + k-means++)
- topology  (Vietoris-Rips persistent homology, bottleneck distance)
- volterra  (Caputo Adams, Markovian lift, second-kind Volterra,
             Fourier inversion of characteristic functions)
- signatures  (truncated tensor signature, log-sig, random reservoir,
               Salvi-Cass-Lyons signature kernel, shuffle product)

All previously stable APIs untouched; abi3-py38 ABI preserved.
New module tests: 29/29 passing. Pre-existing 5 unrelated failures
unchanged.

docs/source/index.rst

@@ -38,6 +38,19 @@ Optimiz-rs provides blazingly fast, production-ready implementations of advanced
    algorithms/grid_search
    algorithms/point_processes
 
+.. toctree::
+   :maxdepth: 2
+   :caption: v1.1 Numerical Primitives
+
+   algorithms/matrix_riccati
+   algorithms/nonsync_covariance
+   algorithms/wavelet
+   algorithms/risk_measures
+   algorithms/graph_spectral
+   algorithms/topology
+   algorithms/volterra
+   algorithms/signatures
+
 .. toctree::
    :maxdepth: 2
    :caption: API Reference