fix(delete): guard per-dir missing-args by server policy; fall back for --dirs

- Only honor the --delete-missing-args exact paths when the server's
  --allow-delete policy left delete_missing_args set.
- -d/--dirs does not recurse, so a per-directory plan would carry no child
  information and could delete the contents of an untraversed directory; fall
  back to the whole-tree end-of-transfer commit for that mode.

src/shared/delete_plan.c

@@ -718,7 +718,9 @@ static bool apply_missing(DeletePlanSession* session, const Config* config) {
   if (session->missing_applied)
     return true;
   session->missing_applied = true;
-  if (session->missing->size == 0)
+  /* The server clears delete_missing_args when its --allow-delete policy is
+     off; never honor the client's exact-path requests then. */
+  if (!config->delete_missing_args || session->missing->size == 0)
     return true;
   DeleteManifest manifest = {
       .keeps = NULL, .protected = NULL, .missing = session->missing, .dirs = NULL};