039 runtime eval scope

// Test: std/runtime:eval uses scope lookup and parsed AST

~import std/runtime
~import std/io

const std = @import("std");

~pub tor greet { name: string } -> string

~proc greet|zig {
    const msg = std.fmt.allocPrint(std.heap.page_allocator, "Hello, {s}!", .{name}) catch "Hello!";
    return msg;
}

~std/runtime:register(scope: "api") {
    greet(1)
}

const TEST_SOURCE = "greet(name: \"World\")";

~std/runtime:parse.source(source: TEST_SOURCE, allocator: std.heap.page_allocator)
| parsed p |> std/runtime:eval(flow: p, scope: "api")
    | result _ |> std/io:print.ln("OK")
    | event-denied _ |> std/io:print.ln("EVENT DENIED")
    | exhausted _ |> std/io:print.ln("EXHAUSTED")
    | validation-error _ |> std/io:print.ln("VALIDATION ERROR")
    | dispatch-error _ |> std/io:print.ln("DISPATCH ERROR")
    | scope-not-found _ |> std/io:print.ln("SCOPE NOT FOUND")
| parse-error _ |> std/io:print.ln("PARSE ERROR")