configs: add ray_kwargs (verl 0.7 struct mode requires it)

Author: Devesh-Maheshwari

configs/grpo_qwen1_5b.yaml

@@ -130,3 +130,10 @@ trainer:
   test_freq: -1               # disable verl's internal eval — we eval externally
   default_hdfs_dir: null
   default_local_dir: results/grpo_checkpoints/qwen-1.5b-v1
+
+# ---------------------------------------------------------------------------
+# Ray runtime — required by verl ≥ 0.7 (struct-mode rejects missing keys).
+# Empty dict means "use Ray defaults" — we don't need anything specific.
+# ---------------------------------------------------------------------------
+ray_kwargs:
+  ray_init: {}

configs/grpo_qwen7b.yaml

@@ -109,3 +109,7 @@ trainer:
   test_freq: -1
   default_hdfs_dir: null
   default_local_dir: results/grpo_checkpoints/qwen-7b-v1
+
+# Ray runtime — required by verl ≥ 0.7 (struct-mode rejects missing keys).
+ray_kwargs:
+  ray_init: {}