Normalize run data once, not once per run streamer

publish_run_data called normalize_run_data inside the per-streamer loop.
normalize_run_data mutates the shared run_data_collaction in place
(replacing each normalized observable with value/events_processed) and is
not idempotent, so with two or more run-mode streamers the second
streamer published value/N^2, the third value/N^3, and so on. Hoist the
normalization out of the loop so it runs exactly once per run regardless
of streamer count.

Fixes #105

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: zhaozhiwen

gemc/actions/run/gRunAction.cc

@@ -256,15 +256,17 @@ void GRunAction::publish_run_data(const std::shared_ptr<GRunDataCollection> &run
 		           " no run streamer map available - run data will not be published.");
 	}
 
+	// Normalize once, before publishing: normalize_run_data() mutates run_data_collaction
+	// in place and is NOT idempotent, so running it per streamer would divide the run
+	// observables by events_processed once for every configured run streamer.
+	normalize_run_data(run_data_collaction);
+
 	for (const auto &[name, gstreamer]: *gstreamer_run_map) {
 		if (gstreamer == nullptr) {
 			log->error(ERR_STREAMERMAP_NOT_EXISTING, FUNCTION_NAME,
 			           " null gstreamer instance for run streamer ", name);
 		}
 
-
-		normalize_run_data(run_data_collaction);
-
 		gstreamer->publishRunData(run_data_collaction);
 	}
 }