011 callsite catchall refused

// ============================================================================
// Test 210_011: FRONTEND_COMPILE_ERROR — a callsite `|?` arm refuses at
//                          parse, metatype-bound or not.
//
// There is no catch-all spelling. An arm names a declared branch or is
// absent; the consumer cannot spell a residual case over outcomes it did
// not name — optionality is the producer's `?` mark, not an arm. The
// parser refuses `|?`, `|? Metatype`, `!?`, and `!? Metatype` uniformly;
// this file pins the metatype-bound form (210_081/082/083 pin the others).
// ============================================================================

const std = @import("std");

~tor process { value: u32 }
| success u32        // Required
| ?warning string   // Optional — may go unnamed, never wild-caught
| ?debug string

~proc process|zig {
    return .{ .success = value };
}

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

~process(value: 10)
| success _ |> _
|? Transition _ |> observe(name: "t1")