Add calibrated opponent distribution model v1

opponent_model.meta.json

@@ -0,0 +1,28 @@
+{
+  "byte_size": 10428416,
+  "coverage": {
+    "level_0_keys": 14856,
+    "level_0_observations": 130000,
+    "level_1_keys": 5011,
+    "level_1_observations": 130000,
+    "level_2_keys": 4807,
+    "level_2_observations": 130000,
+    "level_3_keys": 862,
+    "level_3_observations": 130000,
+    "level_4_keys": 97,
+    "level_4_observations": 130000,
+    "level_5_keys": 52,
+    "level_5_observations": 130000
+  },
+  "format_version": 1,
+  "games": 10000,
+  "generated_at_utc": "2026-06-06T20:10:41.469829+00:00",
+  "generator_policy": "configured_expectiminimax",
+  "histogram_rows": 261893,
+  "scoring_rules_version": 2,
+  "seed": 20260606,
+  "seed_bits": 63,
+  "sha256": "a2f6c4b78506e396e5200d5d0dec1c5ff36a09bae4d52e5d98ef850f0f402415",
+  "shard_games": 1000,
+  "strategy_config_sha256": "3901e04c9c47e0faf70faa3c737b27833ffcd51cd96fce6ece218b47def3fda0"
+}