046 runtime run scope not found

// Test: std.runtime:run returns scope_not_found for missing scopes

~import "$std/runtime"
~import "$std/io"

~pub event greet {}
| ok {}

~proc greet {
    return .{ .ok = .{} };
}

~std.runtime:register(scope: "exists") {
    greet(1)
}

const TEST_SOURCE = "~greet()";

~std.runtime:run(source: TEST_SOURCE, scope: "missing")
| result _ |> std.io:print.ln("OK")
| exhausted _ |> std.io:print.ln("EXHAUSTED")
| parse_error _ |> std.io:print.ln("PARSE ERROR")
| validation_error _ |> std.io:print.ln("VALIDATION ERROR")
| event_denied _ |> std.io:print.ln("EVENT DENIED")
| dispatch_error _ |> std.io:print.ln("DISPATCH ERROR")
| scope_not_found _ |> std.io:print.ln("SCOPE NOT FOUND")