Enhance survey start command to support resuming latest session and update README with resume instructions

build/PARTICIPANT_README.md

@@ -33,6 +33,8 @@ You'll answer a short questionnaire about:
 3. **Read Carefully**: Each task has specific requirements that will be validated
 4. **Exit Anytime**: Press q (depending on interface) to skip a task early if needed
 5. **Interface Help**: Each interface has built-in help - look for it!
+6. **Resume Later**: If you need to stop a task you can resume to the latest task when running 
+   `pm start` again or opening the file on the desktop.
 
 ## Troubleshooting
 
@@ -41,7 +43,8 @@ You'll answer a short questionnaire about:
 - **No database connection**: You can continue without submitting responses and submit later with `pm submit`
 - **Terminal too small**: Resize your terminal window to at least 55x16 characters,
    we recommend to keeping the terminal as large as possible for best experience.
-- **Interface not responding**: Press Ctrl+C to exit, then restart the survey
+- **Interface not responding**: Press Ctrl+C to exit, then restart the "PM Survey" executable,
+   you can then resume the latest task.
 
 
 ## Interfaces You'll Use

internal/commands/survey/start.go

@@ -15,7 +15,10 @@ var (
 // StartCmd is the start command - RunE is set in cmd/survey/
 var StartCmd = &cobra.Command{
 	Use:   "start",
-	Short: "Start the user survey",
+	Short: "Start the user survey, or resume latest session",
+	Long: `Start the survey.
+
+If you have a previous started session, it will resume to the latest task.`,
 }
 
 func init() {
@@ -23,5 +26,6 @@ func init() {
 	StartCmd.Flags().StringVarP(&InterfaceType, "interface", "i", "", "Specify interface.")
 	StartCmd.RegisterFlagCompletionFunc("task", shellcomp.CompletionFunc(task.ListTasks()))
 	StartCmd.RegisterFlagCompletionFunc("interface", shellcomp.CompletionFunc(task.ListInterfaces()))
-	StartCmd.Flags().BoolVar(&DevFlag, "dev", false, "Enable development mode, which skips database connection, submission and intro")
+	StartCmd.Flags().
+		BoolVar(&DevFlag, "dev", false, "Enable development mode, which skips database connection, submission and intro")
 }