Event pages and NPC move routes on RPG maps; rpg action schemas; walk test passes the RPG Plus prologue

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

locale/schema_ja.properties

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+rpg/schema/builtin/rpg_battle = マップからの戦闘
+rpg/schema/builtin/rpg_battle_desc = 敵はカンマ区切り。勝つと勝利フラグが立つ
+rpg/schema/field/enemies = 敵
+rpg/schema/field/win_flag = 勝利フラグ
+rpg/schema/builtin/rpg_teleport = マップ上で移動
+rpg/schema/builtin/rpg_teleport_desc = マスと向き。マップは任意
+rpg/schema/field/map = マップ
+rpg/schema/field/x = X
+rpg/schema/field/y = Y
+rpg/schema/field/dir = 向き