Messaging improvements

[Keats]

Error in config:

Failed to load config at `example_projects/test/rproject.toml`

Caused by:
  TOML parse error at line 3, column 1
  |
3 | r_verson = "4.5"
  | ^^^^^^^^
unknown field `r_verson`, expected one of `name`, `r_version`, `use_devel`, `description`, `license`, `authors`, `keywords`, `repositories`, `suggests`, `urls`, `dependencies`, `dev_dependencies`, `prefer_repositories_for`, `packages_env_vars`, `configure_args`

plan language for download:

 cargo run --release --all-features  -- plan -c example_projects/test/rproject.toml
    Finished `release` profile [optimized] target(s) in 0.05s
     Running `target/release/rv plan -c example_projects/test/rproject.toml`
To Download (10):
  + DBI        1.2.3  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + Rcpp      1.0.14  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + classInt  0.4-11  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + e1071     1.7-16  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + magrittr   2.0.3  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + proxy     0.4-27  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + s2         1.1.7  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + sf        1.0-20  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + units      0.8-7  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26
  + wk         0.9.4  source  https://prism.dev.a2-ai.cloud/rpkgs/stratus/2025-04-26