README: add press_button_terra_delta row

README.md

@@ -1,4 +1,4 @@
-# TERRA — post-trained policies (LIBERO, and one real-robot arm)
+# TERRA — post-trained policies (LIBERO, and real-robot arms)
 
 OpenVLA-7B with TERRA latent-action phase 2 (`latp2_inv` labels), post-trained with a flow-matching head and 4 query
 tokens.  One directory per policy: merged weights (`model-*.safetensors`), action/latent heads (`action_decoder.pt`),
@@ -15,6 +15,7 @@ git clone -b newton https://github.com/DingTianxingjian/Latent_Free.git latent_f
 | `libero_10_full` | libero_10_no_noops | full | 89.0 |
 | `libero_goal_full` | libero_goal_no_noops | full | 94.4 |
 | `piper_pick_can_10k` | piper_pick_can (real robot, AgileX Piper) | 142 | n/a — real robot, see its README |
+| `press_button_terra_delta` | press_button, 4 colours (real robot, Piper) — **DELTA actions**: send `q + delta`, see its README | 95 | n/a — real robot, see its README |
 
 Evaluate the LIBERO ones with `acdc_la.downstream.vla.run_libero_eval_cont --pretrained_checkpoint <dir>`.
 The real-robot directory carries its own README; the deployment wrapper, the measured chunk-length and