uninformative error when unneeded ellipses are passed to solver

[simonpcouch]

If a scoring function has no ... and an argument is passed to the solver:

> chores_eval()
Using model = "claude-3-7-sonnet-latest".
✔ Solving [3s]                                                     
✖ Scoring [15ms]
Error in `fn()`:
! unused argument (solver_chat = <environment>)

[simonpcouch]

This is pretty easy to get to with model_graded_qa() too. With:

are_task <-
  Task$new(
  dataset = are,
  solver = generate(),
  scorer = model_graded_qa(
    chat_anthropic(model = "claude-3-7-sonnet-latest"), 
    partial_credit = TRUE
  ),
  name = "An R Eval"
)

I see:

Error in `purrr::map_chr()`:
ℹ In index: 1.
Caused by error:
! All unnamed arguments must be length 1

as there's no scorer_chat = .