Prototype option b traversal interleaving

Add an experiment-only explicit-continuation traversal prototype that batches policy requests, records CPU/CUDA parity results, and updates the Option B plan with Phase 0/1 evidence.

Co-Authored-By: Codex <codex@openai.com>

experiments/option_b_interleaved_traversal/results_cuda.json

@@ -0,0 +1,583 @@
+{
+  "config": "configs/deep_cfr/default.yaml",
+  "device": "cuda",
+  "traversals": 64,
+  "interleave_width": 32,
+  "max_batch": 128,
+  "max_depth": 8,
+  "max_nodes": 512,
+  "recursive_seconds": 0.19519762697746046,
+  "interleaved_seconds": 0.027952200995059684,
+  "speedup": 6.983265003423523,
+  "recursive_policy_batches": [
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+  "stats": {
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+    "regret_matching_decisions": 512
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+  "sample_checksum": {
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+    "strategy_count": 256,
+    "advantage_target_sum": 9423.44557082653,
+    "strategy_target_sum": 255.99999982118607
+  }
+}