fix: mutex leak, errno-after-free, log_perror misuse, status validation

- multiprocessing: destroy mutex_progress on the dir_entries_mutex
  init-failure path (init >= 7); drop bogus log_perror
- delete_plan: capture errno before free() in apply_deferred_path
- queue/array_list: log_message instead of log_perror for non-errno
  conditions
- protocol: reject unknown wire Status values via status_is_valid() in
  receive_status, receive_status_timed and the keepalive reader; declare
  protocol_receive_status_timed in protocol.h
- protocol: %llu for unsigned long long debug counters
- tests: out-of-range status rejection test

src/shared/multiprocessing.c

@@ -86,11 +86,13 @@ PipelineContextSender* pipeline_context_sender_create(Config* config, Queue* que
   return context;
 
 fail:
-  log_perror("Error initializing synchronization objects");
+  log_message(LOG_LEVEL_ERROR, "%s", "Error initializing synchronization objects");
   if (context->dir_entries_mutex_init)
     mtx_destroy(&context->dir_entries_mutex);
   if (context->dir_entries)
     array_list_delete(context->dir_entries);
+  if (init >= 7)
+    mtx_destroy(&context->mutex_progress);
   if (init >= 6)
     cnd_destroy(&context->condition_not_empty_loader);
   if (init >= 5)