050 identity branches

// Test identity branch syntax: | branch Type instead of | branch { field: Type }
// MUST_RUN: Verify identity values flow correctly at runtime
~import std/io

~pub tor get-number {} -> i32

~proc get-number|zig {
    return 42;
}

~pub tor get-message {} -> string

~proc get-message|zig {
    return "Hello from identity branch!";
}

// Test that identity values work correctly
~get-number(): n |> std/io:print.ln("Got number: {{ n:d }}")

~get-message(): msg |> std/io:print.ln("{{ msg:s }}")