Add RC values, update docs, rename manpage

src/main.go

@@ -120,6 +120,14 @@ func main() {
 			}
 
 			fmt.Printf("\nOverall summary: %d/%d devices processed successfully\n", successCount, totalCount)
+
+			// Set exit code based on results
+			if successCount == 0 {
+				os.Exit(11) // All devices failed
+			} else if successCount < totalCount {
+				os.Exit(10) // Some devices failed
+			}
+			// Exit code 0 (success) when all devices succeeded
 		},
 	}