fix(run): a run takes what is left below it down on its way out

Its subreaper status makes a daemon a git call started its child; at
exit it goes, as freeze's do. Never a process the run did not start.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

implementations/Crafter.Review-Run.cpp

@@ -2187,6 +2187,9 @@ namespace Crafter::Review::Run {
         watcher.request_stop();
         watcher.join();
         Current = nullptr;
+        // Whatever is left below this subreaper - a daemon a git call
+        // started - goes with it; never a process it did not start.
+        Process::KillDescendants();
         return code;
     }
 }