Function detect_ast_version 

pub fn detect_ast_version(json: &str) -> Result<String, VersionedLoadError>

Detect the AST version from a JSON string without full deserialization.

This is useful for logging, debugging, or routing decisions.

Arguments

• json - The JSON string containing the AST

Returns

The detected version string, or "0.0.1" if the field is absent (backwards compatibility default).

Example

let version = detect_ast_version(&json)?;
println!("AST version: {}", version);