Changes in version 0.1.0 (2026-07-17)                  

Initial release: a portable Stan-backend layer that a Stan-based R
package can fit its models through, using either rstan (default) or,
optionally, cmdstanr.

  - stan_options() collects and validates sampler options for the chosen
    backend, forwarding them verbatim and guarding against mixing one
    backend's argument vocabulary into the other.
  - fit_model() dispatches a fit to the backend recorded on the options
    and resolves the calling package's compiled model automatically.
  - Backend-agnostic accessors read a fit without knowing which backend
    produced it: backend_draws_array(), backend_extract(),
    backend_generate_quantities(), and backend_has_draws().
  - use_flexstanr() wires flexstanr into a host package's DESCRIPTION.
  - cmdstanr is an optional backend, used only through
    requireNamespace() guards; rstan is the default and only hard Stan
    dependency.