fix(events): a listener's return ends that listener, not the dispatch

Listeners are compiled into one @ev_<E> function and return branched to its exit, so every
listener declared after one that returned early - and every foreign listener - never heard
the event. The per-kind listener shape (return unless it is my kind) answered only the
first-declared kind. examples/events/answer.ludic holds it; seed regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

changes/listener-return.md

@@ -0,0 +1,7 @@
+bump: patch
+type: fix
+**A `return` inside an `@On` listener ends that listener, not the whole dispatch.** Listeners are
+compiled into one `@ev_<E>` function, and `return` branched to its exit: every listener declared
+after the one that returned, and every foreign listener, never heard the event. The shape it
+broke is the common one - a listener per kind that returns early for every kind but its own -
+where only the first-declared kind was ever answered. `examples/events/answer.ludic` holds it.