feat: checkpoint scripted battle decisions

src/world/OverworldController.lua

@@ -3394,6 +3394,7 @@ function OverworldState:showMapText(textConst, npc, onDone)
     -- the winning contribution's rows run as their owner (09 §4.4): mod:
     -- field routing, strict dispatch and error reports all read the source
     self.runner:run(script, { npc = npc, onDone = onDone,
+      checkpointOnDone = onDone and "release_npc" or nil,
       source = mapScripts.talkSource(self.map.id, textConst) })
     return
   end
@@ -4066,6 +4067,30 @@ function OverworldState:restoreBattleContinuation(battle, origin)
     battle.onFinish = function(result) self:afterBattle(result, battle) end
     return true
   end
+  if origin.kind == "script_battle" then
+    if origin.battleKind ~= battle.kind
+        or (battle.kind == "trainer" and (origin.trainerClass ~= battle.oppClass
+          or origin.partyIndex ~= (battle.partyIndex or 1)))
+        or type(origin.script) ~= "table" or type(origin.pc) ~= "number" then
+      return false
+    end
+    local npc = origin.npcId and self.npcPool and self.npcPool[origin.npcId] or nil
+    if origin.npcId and not npc then return false end
+    battle.onFinish = function(result)
+      local runner = self.runner
+      if not runner or runner:isRunning() then
+        runner = ScriptRunner.new(game, self)
+        self.runner = runner
+      end
+      runner:run(origin.script, {
+        npc = npc,
+        source = origin.source,
+        resumeBattle = { result = result, battle = battle },
+      }, origin.pc)
+    end
+    battle.checkpointScriptContinuation = true
+    return true
+  end
   if origin.kind ~= "trainer_encounter" or battle.kind ~= "trainer"
       or origin.trainerClass ~= battle.oppClass
       or origin.partyIndex ~= (battle.partyIndex or 1)