081 ecology pass ran mechanism

// ECOLOGY TEST: @pass_ran should be added by transforms, not hardcoded externally
//
// ISSUE: The "@pass_ran(\"transform\")" annotation is hardcoded in multiple places.
// Transforms should ADD this annotation themselves, and the walker should just
// check for its presence - not have the string scattered everywhere.
//
// This test verifies that:
// 1. Transforms properly add @pass_ran to prevent re-transformation
// 2. Nested transforms don't infinite loop
// 3. The mechanism works for user-defined transforms too

~import "$std/control"
~import "$std/io"

// Use nested control flow - each should only transform ONCE
~for(0..2)
| each i |>
    if(i > 0)
    | then |> std.io:println(text: "nested transform")
    | else |> std.io:println(text: "first iteration")
| done |> std.io:println(text: "done")