chores 0.1.0

• Initial CRAN submission.

Notable changes pre-CRAN submission

Early adopters of the package will note a few changes made shortly before the
release of the package to CRAN:

• The package was renamed from pal to chores, and the grammar surrounding the
  package shifted a bit in the process: "a pal from the pal package with a
  given role" is now "a helper from the chores package for a given chore."

• The configuration options .pal_fn and .pal_args have been
  transitioned to one option, .chores_chat. That option takes an ellmer Chat,
  e.g. options(.chores_chat = ellmer::chat_claude()).

• There is no longer a default ellmer model. Early in the development
  of chores, if you had an ANTHROPIC_API_KEY set up, the addin would
  "just work." While this was convenient for Claude users, but it means that the
  package spends money on the users behalf without any explicit opt-in.

• Up until CRAN submission, custom prompts were stored in a default
  user-level directory ~/.config/chores (which could be changed using
  the .chores_dir option). CRAN doesn't allow for default behavior that writes
  to the user's filespace, so the package will now error at prompt_new() if
  there's no .chores_dir option set.