v0.2.1

v0.2.1

Patch release. Additive API changes only, no removals or breaking changes.

Added

• Curated top-level entry points, so the main extension points resolve
  directly on the package: styne.Model, styne.Parameter,
  styne.MetropolisHastings, styne.DifferentiableModel.
• ExplicitFunction exported from styne.utility.
• __version__ on the package, single-sourced from installed metadata.

Changed

• Finite-element boundary-condition helpers (apply_dirichlet_1d,
  apply_dirichlet_2d, apply_neumann_1d) now take an optional
  right-hand side. Called with a rhs they behave as before; called
  without one they return the constrained matrix alone.
• PDE inverse-problem example (examples/04_pde_inverse_problem.py)
  rewritten.

Docs

• Corrected the Model contract: parameter-dependent precomputation
  belongs in _interpolate, keeping _evaluate light.
• Likelihood and finite-element docstring overhaul.