Function resolve_json_args 

pub(crate) fn resolve_json_args(
    args: &[String],
    param_names: &[String],
    has_names: bool,
    tag: &str,
) -> Vec<Expr>

Resolve JSON contract argument strings to parsed syn::Expr values.

Handles:

• Named parameter resolution (e.g. "src" → "arg:0")
• Explicit token normalization (arg:, const:, ty: prefixes)
• Lifetime stripping ('a → a)