Add metrics.json to saes_sql_interp_bm2_cs1_experiment_4.3_syn=True/k=32

saes_sql_interp_bm2_cs1_experiment_4.3_syn=True/k=32/model.layers.0.post_attention_layernorm/metrics.json

@@ -0,0 +1 @@
+{"fvu": 0.002374604344367981, "dead_pct": 0.707589328289032}