REGULAR_BATTLE previously never completed on its own, hanging any
cutscene that reached it - START_BATTLE already waits out the whole
encounter and returns to the overworld before this item ever runs, so
it's now a completes-immediately hook point for future regular-battle-
specific follow-up.
Also updates test_saveslot.c for the mapName/partyMembers schema
additions: the round-trip test now writes a valid map name for its
in-use slot, "missingFieldsUseDefaults" is replaced with a test for the
blank-slot short-circuit it was actually hitting, and a new regression
test locks in that an in-use slot with no map name is treated as corrupt.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
YourWishesandClaude Sonnet 5
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