cleanup: remove redundant shutdown.elf, update shell help/completions

programs/src/shell/builtins.cpp

@@ -66,8 +66,8 @@ void cmd_help() {
     montauk::print("  uptime          Show uptime\n");
     montauk::print("  clear           Clear the screen\n");
     montauk::print("  fontscale [n]   Set terminal font scale (1-8)\n");
-    montauk::print("  reset           Reboot the system\n");
-    montauk::print("  shutdown        Shut down the system\n");
+    montauk::print("  shutdown        Shut down the system (poweroff, halt)\n");
+    montauk::print("  reboot          Reboot the system (reset)\n");
     montauk::print("  suspend         Suspend the system\n");
     montauk::print("\n");
     montauk::print("Network commands:\n");

programs/src/shell/shell.h

@@ -145,5 +145,11 @@ constexpr const char* shell_builtins[] = {
     "unset",
     "true",
     "false",
-    "exit"
+    "exit",
+    "shutdown",
+    "poweroff",
+    "halt",
+    "reboot",
+    "reset",
+    "suspend"
 };