refactor: fix ptr_arg clippy warnings (&PathBuf→&Path, &Vec→&[T])
Reduced warnings from 86 to 74 (12 warnings fixed across 16 function signatures).
Changes:
- &PathBuf → &Path (14 signatures in cook_build, fetch, fs)
- &Vec<T> → &[T] (2 signatures in cook_build, web/html)
- &mut Vec<T> → &mut [T] (1 signature in recipe)
- Removed redundant to_path_buf() call exposed by signature change
All callers unaffected via deref coercion. Verification: cargo check ✅,
cargo test --lib ✅ 38/38, cargo clippy 74 remaining (70 result_large_err,
3 too_many_arguments, 1 if_same_then_else).
vasilito
9762cb20b8