Preserve chat stress failure logs and group admission diagnostics

tests/test_chat_sync_stress.c

@@ -149,6 +149,7 @@ int main(void) {
     debug_set_category_level(DEBUG_CATEGORY_DEBUG, DEBUG_LEVEL_TRACE);
     debug_set_category_level(DEBUG_CATEGORY_CHAT_SYNC, DEBUG_LEVEL_TRACE);
     debug_set_category_level(DEBUG_CATEGORY_ETCP, DEBUG_LEVEL_TRACE);
+    debug_set_category_level(DEBUG_CATEGORY_BGP, DEBUG_LEVEL_DEBUG);
 
     if (create_temp_configs() != 0) { fprintf(stderr, "FAIL: config creation\n"); return 1; }
     debug_enable_file_output(log_path, 1);
@@ -259,6 +260,6 @@ cleanup:
 
     int result = (test_phase == 0) ? 0 : 1;
     fprintf(stderr, "=== %s seed=%u (log: %s) ===\n", result ? "FAIL" : "PASS", g_seed, log_path);
-    cleanup_temp_configs();
+    if (!result) cleanup_temp_configs();
     return result;
 }