Remove per-item cutscene authoring macros

Every CUTSCENE_XXX(...) shorthand (CUTSCENE_WAIT, CUTSCENE_TEXT,
CUTSCENE_ENTITY_WALK_TO, etc.) existed to build a cutsceneitem_t literal
in C; real cutscenes are now authored exclusively as .jsonc files, and
the only other users were test fixtures. Deletes all ~55 of these
macros (and the shared CUTSCENE_ITEM(...) helper they built on) along
with their doc comments, leaving each item's struct/enum/Start/Update/
Load declarations untouched.

test_battle.c, test_cutscenecontrol.c, test_cutscenemaparea.c,
test_cutscenesystem.c and test_entityinteract.c now build their
cutsceneitem_t fixtures as plain struct literals instead.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

test/rpg/battle/test_battle.c

@@ -15,11 +15,17 @@ static const cutsceneitem_t CUTSCENE_TEST_SCRATCH_ITEMS[] = {
   // Waiting BEFORE pausing is the correct order: pausing first would
   // freeze BATTLE.state wherever it happened to be and it would never
   // reach PRE_ROUND on its own to satisfy the wait.
-  CUTSCENE_BATTLE_WAIT_STATE(BATTLE_STATE_PRE_ROUND),
-  CUTSCENE_SET_PAUSE(CUTSCENE_PAUSE_BATTLE),
+  {
+    .type = CUTSCENE_ITEM_TYPE_BATTLE_WAIT_STATE,
+    .battleWaitState = { .state = BATTLE_STATE_PRE_ROUND }
+  },
+  { .type = CUTSCENE_ITEM_TYPE_SET_PAUSE, .setPause = CUTSCENE_PAUSE_BATTLE },
   // enemy (slot 2) forced onto allyA (slot 0)
-  CUTSCENE_BATTLE_FORCE_ACTION(2, 0),
-  CUTSCENE_SET_PAUSE(CUTSCENE_PAUSE_NONE)
+  {
+    .type = CUTSCENE_ITEM_TYPE_BATTLE_FORCE_ACTION,
+    .battleForceAction = { .fighterIndex = 2, .targetIndex = 0 }
+  },
+  { .type = CUTSCENE_ITEM_TYPE_SET_PAUSE, .setPause = CUTSCENE_PAUSE_NONE }
 };
 static const cutscene_t CUTSCENE_TEST_SCRATCH = {
   .items = CUTSCENE_TEST_SCRATCH_ITEMS,