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.21.post_attention_layernorm/metrics.json

@@ -0,0 +1 @@
+{"dead_pct": 0.4554315507411957, "fvu": 0.01923564448952675}