Implement get_script command for improved script retrieval in MCP

- Introduced a new `get_script` command to allow agents to read script source code directly from Roblox Studio, enhancing conflict resolution during sync operations.
- Updated the MCP stream handling to support the new command, including error handling for missing or invalid parameters.
- Enhanced the App component to manage the `get_script` command and its response, ensuring proper integration with the existing MCP functionality.
- Updated the TODO list to reflect the addition of the `get_script` command and its associated documentation requirements.

These changes aim to improve the overall functionality and user experience of the MCP integration, particularly in script management.

plugin/src/McpStream.lua

@@ -17,6 +17,7 @@ function McpStream.new(options)
 	local self = setmetatable({}, McpStream)
 
 	self._onSyncCommand = options.onSyncCommand
+	self._onGetScriptCommand = options.onGetScriptCommand
 	self._getPluginConfig = options.getPluginConfig
 	self._wsClient = nil
 	self._running = false
@@ -125,6 +126,33 @@ function McpStream:_tryConnect()
 						end)
 					end
 				end)
+		elseif data.type == "getScript" and data.requestId then
+			Log.info("MCP stream: received getScript command (requestId={})", data.requestId)
+
+			local resultPromise = self._onGetScriptCommand(data.requestId, data)
+
+			resultPromise
+				:andThen(function(result)
+					if self._wsClient then
+						local json = HttpService:JSONEncode(result)
+						pcall(function()
+							self._wsClient:Send(json)
+						end)
+					end
+				end)
+				:catch(function(err)
+					Log.warn("MCP stream: getScript command failed: {}", tostring(err))
+					if self._wsClient then
+						local errorResult = HttpService:JSONEncode({
+							requestId = data.requestId,
+							status = "error",
+							message = tostring(err),
+						})
+						pcall(function()
+							self._wsClient:Send(errorResult)
+						end)
+					end
+				end)
 		end
 	end)