Adds BATTLE_START, BATTLE_SET_STATE and BATTLE_WAIT_SELECTION cutscene
items so a battle's state transitions (opening -> pre-round -> selection
-> executing) are chained through the running cutscene, with
cutsceneSystemInsertItemsNext/InsertItems splitting "splice" from
"splice and advance immediately". Adds battlestateselection's
get-current-fighter/player-attack/player-flee API backing the battle UI,
and battleMoveGetIdByName for JSON-authored ability lookups.
Fixes: off-by-one in battleMoveInit that let the first-defined move
alias BATTLE_MOVE_ID_NULL; a segfault in scenebattle.c from rendering
unfilled (NULL) fighter slots; stale battleGetCurrentFighter/
battlePlayerAttack/battlePlayerFlee references in the battle UI.
Adds assertions across the battle/scene/UI code for fighter-index
bounds and non-null invariants. Updates battletest.jsonc for the new
BATTLE_START item schema.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
YourWishesandClaude Sonnet 5
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