renamed some files, implemented stage and package sealing, and introduced scaffolding for signing

modules/build/build.cpp

@@ -79,6 +79,7 @@ extern "C" const char* dpm_get_description(void) {
  * @param argv Array of argument strings
  * @return 0 on success, non-zero on failure
  */
+// In build.cpp, update the dpm_module_execute function
 extern "C" int dpm_module_execute(const char* command, int argc, char** argv) {
     // Parse the command
     Command cmd = parse_command(command);
@@ -94,6 +95,15 @@ extern "C" int dpm_module_execute(const char* command, int argc, char** argv) {
         case CMD_MANIFEST:
             return cmd_manifest(argc, argv);
 
+        case CMD_SIGN:
+            return cmd_sign(argc, argv);
+
+        case CMD_SEAL:
+            return cmd_seal(argc, argv);
+
+        case CMD_UNSEAL:
+            return cmd_unseal(argc, argv);
+
         case CMD_UNKNOWN:
             default:
                 return cmd_unknown(command, argc, argv);