The splatter music stays on the splatter court

Every run starts the ambience, and the ambience was un-ducking both court beds
at once — so once you had played the gore mode, its music followed you into
classic tennis for the rest of the session. Leaving the court is one event;
arriving is not. Each bed brings itself back and nothing else.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

PROJECT.md

@@ -451,6 +451,13 @@ followed you onto the silent menu.
 `menuMusic()` is now the one call that means "we are in the menus": it starts the theme, un-ducks
 it, and ducks both court beds. `ambient()` and `zombieMusic()` un-duck themselves for the same
 reason — the SECOND run would otherwise have been played in the silence the menu left them in.
+
+**...and each of those un-ducks ITS OWN BED ONLY.** The first cut had `ambient()` un-duck both
+court beds together, which put the splatter music back on in classic tennis for the rest of the
+session — Oliver caught it on the retest: *"after playing the splatter gore, the zombie background
+sound also keeps playing in the normal tennis game."* LEAVING the court is one event and ducks both
+beds; ARRIVING is not. The ambience belongs to every mode, the zombie bed belongs to the gore, and
+only `enterSplatter` may bring that one up.
 **The rule, for anything added here later: a bed's start function must also un-duck it, because
 starting it is a no-op the second time and ducking it is not.** `audio.bedTest` exposes the duck
 set to the suite (same idea as `netTest`), which is what makes this testable at all — the beds