fibers: drop redundant async_void — the variadic async covers nullary workers

async_void :: ufcs (io, worker: Closure() -> $R) -> Future($R) was redundant:
the variadic async :: ufcs (io, worker: Closure(..$args) -> $R, ..$args) binds
$args to the empty pack, so context.io.async(() -> $R => ...) already calls
worker() and returns Future($R). The name was also misleading — it returns
Future($R), not void (a true void form is Future(void), separate, blocked by
issue 0150).

Removed the definition (std/io.sx) + the std.sx re-export; nothing else
referenced it. Locked the nullary path in examples/1805 (prints nullary: 42) so
the coverage async_void provided is not lost. Suite green 736/0.

library/modules/std.sx

@@ -97,7 +97,6 @@ Future      :: io_mod.Future;
 FutureState :: io_mod.FutureState;
 IoErr       :: io_mod.IoErr;
 async       :: io_mod.async;
-async_void  :: io_mod.async_void;
 await       :: io_mod.await;
 cancel      :: io_mod.cancel;
 // `timeout` / `Future(void)` are DEFERRED (B1.4) pending issue 0150