Fix one-epoch track GRU smoke launcher

docs/easycom_track_gru_residual.md

@@ -60,6 +60,11 @@ The existing EasyCom local sidecars already contain crop features, frame times,
 source-clip indices and person IDs; this experiment does not require feature
 re-extraction.
 
+Runtime status (2026-09-07): the focused causal-history, exact-zero-gate and
+train/infer round-trip tests passed in 49.699 seconds on the remote PyTorch/L20
+environment. This verifies the code path, not model quality. The one-session
+GPU training smoke and full experiment remain unmeasured.
+
 ## Fair initialization
 
 `track-gru-residual` requires `--initialize-pooled-checkpoint`. The loader
@@ -103,6 +108,9 @@ CUDA_VISIBLE_DEVICES=0 \
 bash run_easycom_track_gru_residual.sh all 0
 ```
 
+For `EPOCHS=1`, the launcher automatically uses zero warmup unless
+`WARMUP_EPOCHS` is explicitly supplied.
+
 Then use three GPUs in three foreground terminals. These runs report Session
 12 development scores, not the official test set: