feat(mod-api): add trainer battle party scope

tests/modkit/cases/checkpoints.lua

@@ -358,11 +358,13 @@ T.same(checkpoints:capture(game), beforeFailure,
 -- The same public facade must carry a real battle checkpoint end to end. The
 -- engine-side fixture is deliberately constructed outside the probe mod; the
 -- mod sees and calls only mod.checkpoints.
-local function makeBattleGame()
+local function makeBattleGame(kind)
   local data = Fixtures.fresh()
   local save = SaveData.newGame()
   save.meta.playthroughId = "public-battle-playthrough"
-  save.party = { Pokemon.new(data, "FIXMON_A", 20) }
+  save.party = { Pokemon.new(data, "FIXMON_A", 20),
+    Pokemon.new(data, "FIXMON_B", 19),
+    Pokemon.new(data, "FIXMON_C", 18) }
   -- The tiny fixture registry intentionally omits several full-game defaults.
   -- Normalize those once, then place the save on its fixture map.
   SaveData.validate(save, data)
@@ -387,7 +389,8 @@ local function makeBattleGame()
     self.player = { cellX = x, cellY = y, facing = facing, surfing = false }
   end
   function battleOw:restoreBattleContinuation(restoredBattle, origin)
-    if origin.kind ~= "wild_encounter" or origin.map ~= self.map.id then
+    local expected = kind == "trainer" and "trainer_encounter" or "wild_encounter"
+    if origin.kind ~= expected or origin.map ~= self.map.id then
       return false
     end
     restoredBattle.onFinish = function() end
@@ -397,9 +400,19 @@ local function makeBattleGame()
     data = data, save = save, stack = stack, overworld = battleOw,
   }, { __index = GameMethods })
   stack.states[1] = battleOw
-  local battle = BattleState.newWild(battleGame, "FIXMON_B", 12)
+  local battle
+  if kind == "trainer" then
+    battle = BattleState.newTrainer(battleGame, "OPP_FIX_YOUNGSTER", 1, {
+      playerPartyIndices = { 2, 3 },
+    })
+  else
+    battle = BattleState.newWild(battleGame, "FIXMON_B", 12)
+  end
   battle.phase, battle.queue = "menu", {}
-  battle.checkpointOrigin = { kind = "wild_encounter", map = "FIX_TOWN" }
+  battle.checkpointOrigin = kind == "trainer"
+    and { kind = "trainer_encounter", map = "FIX_TOWN", npcId = "TRAINER_1",
+      trainerClass = "OPP_FIX_YOUNGSTER", partyIndex = 1 }
+    or { kind = "wild_encounter", map = "FIX_TOWN" }
   battle.musicKind = battle:computeMusicKind()
   battle.onFinish = function() end
   stack.states[2] = battle
@@ -437,6 +450,62 @@ if battleSnapshot then
     "public battle capture/restore/capture is a normalized differential roundtrip")
 end
 
+checkpointRngState = "scoped-trainer-rng-A"
+local scopedGame, scopedBattle = makeBattleGame("trainer")
+local scopedSnapshot, scopedCaptureCode = checkpoints:capture(scopedGame)
+T.check(scopedSnapshot ~= nil,
+  "public checkpoints capture a scoped trainer battle: "
+    .. tostring(scopedCaptureCode))
+if scopedSnapshot then
+  T.same(scopedSnapshot.runtime.battle.playerPartyIndices, { 2, 3 },
+    "capture stores the battle-local save-party index scope")
+  local restored, code, message = checkpoints:restore(scopedGame, scopedSnapshot)
+  T.check(restored == true,
+    "public checkpoints restore a scoped trainer battle: "
+      .. tostring(code) .. " / " .. tostring(message))
+  local scopedRestored = scopedGame.stack:top()
+  T.same(scopedRestored.playerPartyIndices, { 2, 3 },
+    "restore reconstructs the same ordered party scope")
+  T.check(scopedRestored.playerParty[1] == scopedGame.save.party[2]
+      and scopedRestored.playerParty[2] == scopedGame.save.party[3],
+    "restored scope points at authoritative save-party records")
+
+  scopedSnapshot.runtime.battle.playerPartyIndices = nil
+  local oldRestored, oldCode = checkpoints:restore(scopedGame, scopedSnapshot)
+  T.check(oldRestored == true,
+    "an old checkpoint without party scope remains compatible: "
+      .. tostring(oldCode))
+  T.eq(scopedGame.stack:top().playerParty, nil,
+    "an old checkpoint restores the vanilla full-party view")
+end
+
+local function scopedCheckpoint()
+  local freshGame = makeBattleGame("trainer")
+  local snapshot = assert(checkpoints:capture(freshGame))
+  return freshGame, snapshot
+end
+
+local excludedGame, excludedSnapshot = scopedCheckpoint()
+excludedSnapshot.runtime.battle.player.index = 1
+local excludedRestored, excludedCode = checkpoints:restore(excludedGame,
+  excludedSnapshot)
+T.check(excludedRestored == false and excludedCode == "invalid_checkpoint",
+  "a scoped checkpoint rejects an active battler outside the eligible view")
+
+local malformedGame, malformedSnapshot = scopedCheckpoint()
+malformedSnapshot.runtime.battle.playerPartyIndices.extra = 3
+local malformedRestored, malformedCode = checkpoints:restore(malformedGame,
+  malformedSnapshot)
+T.check(malformedRestored == false and malformedCode == "invalid_checkpoint",
+  "a scoped checkpoint rejects non-array scope members instead of failing open")
+
+local participantGame, participantSnapshot = scopedCheckpoint()
+participantSnapshot.runtime.battle.participants = { 1 }
+local participantRestored, participantCode = checkpoints:restore(
+  participantGame, participantSnapshot)
+T.check(participantRestored == false and participantCode == "invalid_checkpoint",
+  "a scoped checkpoint rejects excluded participant references")
+
 -- The mod receives the normal public hook facade, never BattleState. START
 -- at the restored safe decision reaches its semantic auxiliary action without
 -- selecting a native command.

tests/modkit/cases/trainer_before_battle.lua

@@ -0,0 +1,71 @@
+-- A sandboxed mod can defer an ordinary trainer engagement and later resume
+-- it with a battle-local player-party scope, using only public mod surfaces.
+
+package.path = "./?.lua;./?/init.lua;" .. package.path
+love = love or require("tests.love_stub")
+
+local T = require("tests.modkit")
+local OW = require("src.world.OverworldController")
+
+local FIXTURE = {
+  ["mods/scope_probe/manifest.json"] = [[{
+    "id": "scope_probe",
+    "name": "Scope Probe",
+    "version": "1.0.0",
+    "entry": "main.lua",
+    "api": 2
+  }]],
+  ["mods/scope_probe/main.lua"] = [[
+    local mod = ...
+    mod.hooks:wrap("trainer.before_battle", function(next, game, context, continue)
+      mod.exports.game = game
+      mod.exports.context = context
+      mod.exports.continue = continue
+      return true
+    end)
+  ]],
+}
+
+local vanilla = T.sdk.loadNone({})
+local vanillaCalls, vanillaOptions = 0
+OW.prepareTrainerBattle({ id = "game" }, {
+  trainerClass = "OPP_FIX_YOUNGSTER", partyIndex = 1,
+  mapId = "FIX_ROUTE", npcId = "TRAINER_1",
+}, function(options)
+  vanillaCalls, vanillaOptions = vanillaCalls + 1, options
+end)
+T.eq(vanillaCalls, 1, "no mod starts the trainer battle exactly once")
+T.eq(vanillaOptions, nil, "no mod supplies no battle-local party scope")
+vanilla.release()
+
+local run = T.sdk.loadMods({ "mods/scope_probe" }, {
+  fs = T.sdk.memfs(FIXTURE),
+})
+T.eq(#run.errors, 0,
+  "the public preparation probe loads clean (" .. tostring(run.errors[1]) .. ")")
+local game = { id = "live-game" }
+local calls, options = 0
+OW.prepareTrainerBattle(game, {
+  trainerClass = "OPP_FIX_YOUNGSTER", partyIndex = 2,
+  mapId = "FIX_ROUTE", npcId = "TRAINER_7",
+}, function(value)
+  calls, options = calls + 1, value
+end)
+T.eq(calls, 0, "a claiming public hook defers battle construction")
+local out = run.loader.exports.scope_probe or {}
+T.check(out.game == game, "the hook receives the live game")
+T.same(out.context, {
+  trainerClass = "OPP_FIX_YOUNGSTER", partyIndex = 2,
+  mapId = "FIX_ROUTE", npcId = "TRAINER_7",
+}, "the hook receives data-only trainer identity context")
+T.eq(out.continue({ playerPartyIndices = { 2, 4 } }), true,
+  "the retained continuation resumes the deferred battle")
+T.eq(calls, 1, "resume constructs the battle exactly once")
+T.same(options, { playerPartyIndices = { 2, 4 } },
+  "ordered eligible indices cross the public seam unchanged")
+T.eq(out.continue({ playerPartyIndices = { 1 } }), false,
+  "the continuation refuses a second invocation")
+T.eq(calls, 1, "a duplicate resume cannot start a second battle")
+run.release()
+
+T.finish("trainer_before_battle")