trainers.battleTheme validated and merged onto the trainer record but was
never read: battle music came solely from data.audio.battle[kind] where
kind is computeMusicKind()'s final/gym/trainer/wild. Route both battle-
theme start sites through a single choke point:
- BattleState:playBattleTheme() cues Music.playBattle with the override
(self.trainer.battleTheme via battleTheme()), defaulting to the kind
when unset, so vanilla fights and #782's non-gym Giovanni are unchanged.
- BattleState:enter() and OverworldController:pushBattle() both call it.
- Music.playBattle gains an optional 4th song arg that overrides the kind
default, and real call sites now populate the music.select trainerId.
- Victory jingles stay kind-based: a custom battle theme has no derivable
win-variant.
New ROM-free T2 suite tests/engine/trainer_battle_theme_bug945.lua covers
mod load, override resolution, the choke point, and the nil-override
parity gate.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Shane McGovern