v0.11.0-beta — Python bindings for the 0.10.0 wave (#15)

[0.11.0-beta] — 2026-06-27

Python binding surface for the 0.10.0-beta feature wave (#11–#14 + A1).
Issues #11, #12, #13, #14, and the graph Krylov additions from the 0.10.x patch
series are now usable from Python via the semiflow-pde wheel. No breaking
changes to the existing Python surface or the Rust public API.

Added (Python bindings, #15)

• SymmetricOperator.from_csr / SymmetricOperator.evolve_batched —
  externally-assembled symmetric PSD sparse operators (FEM stiffness, Robin BC)
  accepted as CSR arrays; batched time-stepping across multiple right-hand sides.
• symmetric_op_expmv_frechet — combined matrix-exponential action +
  per-entry Fréchet gradient in one call. EntrySensitivity is not exposed as a
  separate Python class; the gradient is returned directly from this function.
• MassKOperator / mass_lumped_evolve — generalized-eigenproblem (M, K)
  propagation via the congruence chain  = R⁻ᵀKR⁻¹; lumped-mass 3-liner path.
• ConservativeDiffusionChernoff / assemble_conservative_csr_1d —
  conservative divergence-form diffusion with harmonic-mean face conductivities;
  to_symmetric_operator() bridge to the Krylov engine.
• phi_action / phi_action_batched / Etdrk4 — ETD φ-functions and the
  Cox–Matthews ETDRK4 semilinear integrator. Nonlinearity is menu-based
  (AllenCahn, Burgers, GrayScott, KuramotoSivashinsky); arbitrary
  per-step Python callbacks are deferred (ADR-0179 / ADR-0189 wall preserved).
• Laplacian.from_csr — direct CSR-based Laplacian construction path.
• PEP 561 stubs updated to cover all new symbols; 16/16 smoke tests green.

Changed

• Registry metadata: Changelog and Release Notes links now appear on the
  PyPI sidebar (semiflow-pde [project.urls]), the crates.io semiflow page
  (README ## Changelog section), and the npm @semiflow/wasm page
  (README ## Changelog / Release notes section).