122 reject construct glyph on resume effect

// Glyph discipline (KORU102): `=>` CONSTRUCTS a branch, so it is illegal on an
// effect/event declared `-> T` (single payload, no branches). The resume value
// of `! ask []const u8 -> i32` is PRODUCED with `->`, not constructed with `=>`.
// Without this rejection, `=> 42` silently emits `return 42` — the exact
// glyph ambiguity Phase 2 closes. Twin of the positive 400_116/400_117.
~import std/io

~pub tor query { q: string }
! ask string -> i32
| done i32

~proc query|zig {
    const a = ask(q);
    return .{ .done = a };
}

~query(q: "x")
! ask _ => 42
| done r |> std/io:print.ln("{{ r:d }}")