013 callsite catchall refused

// Test 355_013: FRONTEND_COMPILE_ERROR — a callsite `|?` refuses at parse, even when
//                          offered as a rescue for an unhandled required
//                          branch.
//
// 'failure' is required and unnamed — but the answer is to name it, not
// to write an arm for "the rest." The parser refuses the spelling before
// coverage is ever judged: there is no residual case at the call site.

~tor process { value: u32 }
| success u32
| failure string

~proc process|zig {
    if (value > 5) return .{ .success = value };
    return .{ .failure = "small" };
}

~pub tor observe { name: string }
~proc observe|zig {
    _ = name;
}

// 'failure' is required and unnamed — |? cannot stand in for it.
~process(value: 10)
| success _ |> observe(name: "ok")
|? |> observe(name: "catchall")