Add Qwen235 state replay diagnosis

runs/frontier-fidelity-envelope-v1/test_fidelity_envelope.py

@@ -135,6 +135,58 @@ class FidelityEnvelopeTest(unittest.TestCase):
             self.assertEqual(len(evidence), 1)
             self.assertEqual(evidence[0]["log"], "stdout.log")
 
+    def test_qwen235_state_replay_changes_observation_flags_only(self) -> None:
+        module = load("run_qwen235_fixed_pd_state_replay.py")
+        base = [
+            "/usr/bin/python3",
+            "-m",
+            "frontier.main",
+            "--metrics_config_output_dir",
+            "/frozen/metrics",
+            "--metrics_config_run_id",
+            "frozen",
+            "--no-metrics_config_store_frontier_stage_batch_ledger",
+            "--attn_tensor_parallel_size",
+            "8",
+            "--moe_expert_parallel_size",
+            "8",
+            "--communication_collective_profile_path",
+            "/profiles/real-allreduce.csv",
+        ]
+        transformed = module.transform_command(
+            base, metrics_root=Path("/new/metrics"), run_id="state-run"
+        )
+        self.assertEqual(
+            module.option_value(transformed, "--attn_tensor_parallel_size"), "8"
+        )
+        self.assertEqual(
+            module.option_value(transformed, "--communication_collective_profile_path"),
+            "/profiles/real-allreduce.csv",
+        )
+        self.assertIn(
+            "--metrics_config_store_frontier_stage_batch_ledger", transformed
+        )
+        self.assertIn("--metrics_config_keep_individual_batch_metrics", transformed)
+        self.assertNotIn(
+            "--no-metrics_config_store_frontier_stage_batch_ledger", transformed
+        )
+
+    def test_qwen235_state_replay_rejects_implicit_ledger_base(self) -> None:
+        module = load("run_qwen235_fixed_pd_state_replay.py")
+        base = [
+            "/usr/bin/python3",
+            "-m",
+            "frontier.main",
+            "--metrics_config_output_dir",
+            "/frozen/metrics",
+            "--metrics_config_run_id",
+            "frozen",
+        ]
+        with self.assertRaisesRegex(ValueError, "explicitly disable one full Frontier ledger"):
+            module.transform_command(
+                base, metrics_root=Path("/new/metrics"), run_id="state-run"
+            )
+
     def test_materialize_qwen235_allreduce_requires_serving_contract(self) -> None:
         module = load("materialize_qwen235_v020_allreduce.py")
         with tempfile.TemporaryDirectory() as temporary: