Function eval_transform 

pub async fn eval_transform(
    transform: &EdgeTransform,
    inputs: Vec<Value>,
    registry: &TransformRegistry,
) -> Result<Value, EngineError>

Evaluate an EdgeTransform against a list of input values.

• PassThrough — returns the first input value, or Value::Null if empty.
• Named(name) — looks up name in registry, calls it, and awaits the result.
• Inline(f) — calls f synchronously (sync closure, no await).
• Script(code) — evaluates code via the embedded Rhai engine. The script receives the inputs as an inputs array variable and must return a value.