Add initial sync complete callback to ServeSession for one-shot mode handling

- Introduced `__initialSyncCompleteCallback` in `ServeSession` to manage actions after the initial sync is complete.
- Updated `App:startSession` to set the callback, ensuring proper disconnection after initial sync in one-shot mode.
- Refactored comments in `App:startSession` for clarity on sync behavior and disconnection logic.

plugin/src/ServeSession.lua

@@ -116,6 +116,7 @@ function ServeSession.new(options)
 		__statusChangedCallback = nil,
 		__userConfirmCallback = nil,
 		__patchUpdateCallback = nil,
+		__initialSyncCompleteCallback = nil,
 		__serverInfo = nil,
 		__confirmingPatch = nil,
 		__connections = connections,
@@ -156,6 +157,10 @@ function ServeSession:setPatchUpdateCallback(callback)
 	self.__patchUpdateCallback = callback
 end
 
+function ServeSession:setInitialSyncCompleteCallback(callback)
+	self.__initialSyncCompleteCallback = callback
+end
+
 function ServeSession:setUpdateLoadingTextCallback(callback)
 	self.__updateLoadingText = callback
 end
@@ -306,6 +311,12 @@ function ServeSession:start()
 				return self:__confirmAndApplyInitialPatch(catchUpPatch, serverInfo)
 			end)
 		end)
+		:andThen(function()
+			-- Initial sync is fully complete (including any writes to the server)
+			if self.__initialSyncCompleteCallback ~= nil then
+				self.__initialSyncCompleteCallback()
+			end
+		end)
 		:catch(function(err)
 			if self.__status ~= Status.Disconnected then
 				self:__stopInternal(err)
@@ -658,11 +669,8 @@ function ServeSession:__confirmAndApplyInitialPatch(catchUpPatch, serverInfo)
 			if selection == "push" then
 				-- Apply Rojo removal to Studio
 				table.insert(pushPatch.removed, idOrInstance)
-			elseif selection == "pull" and self.__twoWaySync then
-				-- Don't remove in Studio, but we can't easily "add back" to Rojo
-				-- For now, just skip (similar to ignore)
 			end
-			-- "ignore" items are skipped
+			-- "pull" skipped: can't easily "add back" to Rojo, same as "ignore"
 		end
 
 		-- Process added items