Add lifecycle hooks for tool mods

src/core/Game.lua

@@ -169,6 +169,11 @@ function Game:returnToTitle()
 end
 
 function Game:step(dt)
+  -- Tool mods (autoplay, accessibility drivers, input visualizers) act on
+  -- the same fixed-step boundary as a physical controller.  Run them before
+  -- Input:step promotes queued edges so a button chosen here is visible to
+  -- this logic tick, not one tick later.  With no wrapper this is a no-op.
+  ModRuntime.call("input.step", function() end, self, dt)
   self.input:step()
   -- serviced unconditionally: a link battle's ENet transport must not
   -- stall just because PartyMenu/ChoiceBox/NamingScreen is temporarily
@@ -476,6 +481,11 @@ end
 -- Capture the live world state into the save table and persist it.
 -- Options are flushed to options.lua as part of SaveData.save.
 function Game:writeSave()
+  -- Tool sessions can be deliberately ephemeral. Give them one narrow veto
+  -- before captureSave mutates the snapshot or any progress bytes reach disk.
+  if ModRuntime.call("save.write", function() return true end, self) == false then
+    return false
+  end
   if self.overworld and self.overworld.captureSave then
     self.overworld:captureSave(self.save)
   end
@@ -486,7 +496,7 @@ function Game:writeSave()
   if ModRuntime.wants("save.writing") then
     ModRuntime.emit("save.writing", { save = self.save, meta = self.save.meta })
   end
-  SaveData.save(self.save)
+  return SaveData.save(self.save)
 end
 
 -- Persist options.lua only (Options menu / hotkeys 2-5).  Keeps settings

src/script/Commands.lua

@@ -676,11 +676,15 @@ function Commands.record_hall_of_fame(ctx)
       if game.overworld then
         game.overworld.lastOutdoor = ctx.save.lastOutdoor
       end
-      if game.writeSave then game:writeSave() end
+      local saveAllowed = true
+      if game.writeSave then saveAllowed = game:writeSave() ~= false end
       -- writeSave's captureSave re-stamps the live HALL_OF_FAME coords;
       -- re-apply home and persist so CONTINUE resumes in the bedroom.
       SaveData.applyPostGameHome(ctx.save, boot)
-      SaveData.save(ctx.save)
+      -- A tool session may veto Game:writeSave to keep its in-memory run
+      -- isolated from the player's real save.  The relocation write is part
+      -- of that same save operation and must honor the same decision.
+      if saveAllowed then SaveData.save(ctx.save) end
     end)
   end)
   runner:yield()

src/ui/TitleState.lua

@@ -7,6 +7,8 @@ local Font = require("src.render.Font")
 local Music = require("src.core.Music")
 local GameVersion = require("src.core.GameVersion")
 local Strings = require("src.core.Strings")
+local Runtime = require("src.mods.Runtime")
+local Logger = require("src.core.Logger")
 
 local TitleState = {}
 TitleState.__index = TitleState
@@ -136,6 +138,8 @@ local function hasSave()
   return ok and info ~= nil
 end
 
+local function sameItems(_, items) return items end
+
 -- The CONTINUE info window (main_menu.asm DisplayContinueGameInfo):
 -- PLAYER / BADGES / POKéDEX / TIME over the title, shown after choosing
 -- CONTINUE.  A confirms and loads the game, B returns to the main menu.
@@ -211,6 +215,13 @@ function TitleState:openMenu()
       love.event.quit()
     end
   end })
+  local hooked = Runtime.call("ui.title_menu.items", sameItems, game, items)
+  if type(hooked) == "table" then
+    items = hooked
+  else
+    Logger.error("ui.title_menu.items returned %s; keeping the vanilla items",
+                 type(hooked))
+  end
   local th = #items * 2 + 2
   local menu = Menu.new(game, items, { tx = 0, ty = 0, tw = 13, th = th })
   -- full-width title LOGO zones would recolor this box; see sgbPalettes