Story phase 5, prepared: the gore bed is one switch for the metal track

config.GORE_BED names the track that plays while the dead are being
killed (gore and every story chapter, from the transformation's
run-off on) and its loop length and level. When Oliver has the metal
track, it goes into assets/audio and these three values change; nothing
else does. v383, staging only.

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

PROJECT.md

@@ -711,8 +711,12 @@ silently dropped, so `delay(k, more)` merges them.
   the free tier on, act I's card points at the full game.
 - The non-story summaries' fixture is the story now (door 'next' → `start('story')`).
 
+**Phase 5, prepared:** the gore bed is one switch, `config.GORE_BED` = {file, loopEnd, vol}. It plays
+in gore and in every story chapter from the transformation's run-off on, and is ducked everywhere else.
+Metal is: drop the track into `assets/audio` and change those three values.
+
 **Not done / open:**
-- Phase 5 (the metal bed when Oliver has a track; Members' Night).
+- Phase 5: Oliver's metal track, and Members' Night (the boss marathon, option C).
 - The tutorial and the ghost hand for the new double tap.
 - Stats: story kills are not banked into the career totals (no `endRun`).
 - The old cup mode is unreachable but still in MODES.