diff --git a/docs/action-aware-constraint-pilot-v2-protocol-20260714.md b/docs/action-aware-constraint-pilot-v2-protocol-20260714.md
new file mode 100644
index 0000000..d51ca29
--- /dev/null
+++ b/docs/action-aware-constraint-pilot-v2-protocol-20260714.md
@@ -0,0 +1,35 @@
+# Action-aware constraint pilot v2 amendment
+
+Status: **FROZEN AFTER V1 CONTROLLER STOP AND BEFORE V2 GPU RUNS**.
+
+Date: 2026-07-14 (Asia/Singapore).
+
+The V1 configuration matrix and every scientific gate remain unchanged.  V2
+fixes one controller bug and reruns every configuration and repetition fresh.
+
+## V1 controller failure
+
+The MNS64/MBBT2048 burn-in completed all 510 requests in 61.259 seconds, below
+the frozen 90-second operational limit.  However, the controller accidentally
+assigned the preceding 16-request warm-up result to `burnin_result`; its state
+therefore recorded 4.376 seconds and evaluated the wrong object.
+
+The first measured replay was terminated after 75 seconds, before it produced
+a result.  No target configuration had started.  V1 consumed
+0.3184109431 H20-hours and contributes no action label or telemetry to V2.
+
+## V2 correction and regression gate
+
+- The completed burn-in `run_client()` return value is assigned to
+  `burnin_result`.
+- A dedicated `burnin_gate()` rejects any non-anchor object, any request count
+  other than 510, and elapsed time above 90 seconds.
+- Unit tests explicitly pass a warm-up object and require rejection, then test
+  accepted and over-limit burn-ins.
+- All five configs and 15 measured runs use a new run root; no V0/V1 runtime
+  artifact is reused.
+
+V0 and V1 together consumed 0.7043978426 H20-hours.  V2's incremental hard cap
+is therefore 7.2956021574 H20-hours, preserving the original global 8.0
+H20-hour cap.  The authoritative accounting file is
+`runs/action-aware-v0/prior-attempts-v2.json`.
diff --git a/runs/action-aware-v0/pilot-manifest-v2.json b/runs/action-aware-v0/pilot-manifest-v2.json
new file mode 100644
index 0000000..47908c7
--- /dev/null
+++ b/runs/action-aware-v0/pilot-manifest-v2.json
@@ -0,0 +1,227 @@
+{
+  "budget": {
+    "expected_h20_hours": [
+      6.0,
+      7.2
+    ],
+    "expected_wall_minutes": [
+      90,
+      110
+    ],
+    "global_hard_cap_h20_hours": 8.0,
+    "hard_cap_h20_hours": 7.295602157380846,
+    "prior_attempt_artifact": "/home/admin/cpfs/wjh/aituner/aituner-action-aware-20260714/runs/action-aware-v0/prior-attempts-v2.json",
+    "prior_attempt_h20_hours": 0.7043978426191542,
+    "safety_h20_hours": 0.25,
+    "session_estimate_h20_hours": 1.35
+  },
+  "burnin": {
+    "anchor": 0.18919793755240089,
+    "arrival_order_sha256": "6c0ac4cb9a30ef501eeeacc8e6cc631c345e976db5ccf530ea5a1ec706d62a24",
+    "input_length_order_sha256": "7939cc20e1a00d1031d27d71508789f38decbbbb6ea59a1df18b2ec342fd2ef8",
+    "offered_req_s": 8.5,
+    "offered_req_s_per_gpu": 2.125,
+    "request_id_order_sha256": "84f4809acbc8acd3b1d14dfa357134a1dc0b9287341624b33f598dafeef54dc7",
+    "selected_count": 510,
+    "study": "/home/admin/cpfs/wjh/fidelity-prefix-pilot-20260714/private/studies/burnin-tp4.json",
+    "study_sha256": "5d6c2098042909a863efd3112818fbee9bafe96f22898ac98b66846dbe1fef0f"
+  },
+  "configs": [
+    {
+      "id": "b_base",
+      "mbbt": 2048,
+      "mns": 64,
+      "repetition_order": [
+        1,
+        2,
+        3
+      ]
+    },
+    {
+      "id": "a_base",
+      "mbbt": 8192,
+      "mns": 16,
+      "repetition_order": [
+        2,
+        3,
+        1
+      ]
+    },
+    {
+      "id": "shared",
+      "mbbt": 8192,
+      "mns": 64,
+      "repetition_order": [
+        3,
+        1,
+        2
+      ]
+    },
+    {
+      "id": "b_mns",
+      "mbbt": 2048,
+      "mns": 128,
+      "repetition_order": [
+        1,
+        3,
+        2
+      ]
+    },
+    {
+      "id": "a_mbbt",
+      "mbbt": 16384,
+      "mns": 16,
+      "repetition_order": [
+        2,
+        1,
+        3
+      ]
+    }
+  ],
+  "engine": {
+    "burnin_max_elapsed_s": 90.0,
+    "client_timeout_s": 450.0,
+    "disable_slo_early_stop": true,
+    "duration_s": 300.0,
+    "tp": 4
+  },
+  "gates": {
+    "material_kv_usage": 0.9,
+    "minimum_exclusive_fraction": 0.1,
+    "minimum_exclusive_ratio": 5.0,
+    "minimum_relative_winner_margin": 0.1,
+    "phase_fractions": [
+      0.25,
+      0.5,
+      0.75,
+      1.0
+    ]
+  },
+  "regimes": {
+    "A": {
+      "actions": {
+        "mbbt": "a_mbbt",
+        "mns": "shared"
+      },
+      "source": "a_base"
+    },
+    "B": {
+      "actions": {
+        "mbbt": "shared",
+        "mns": "b_mns"
+      },
+      "source": "b_base"
+    }
+  },
+  "repetitions": {
+    "1": {
+      "merged_trace": {
+        "bytes": 337429767,
+        "path": "/home/admin/cpfs/wjh/intervention-response-v3-20260714/private/traces/rep1.jsonl",
+        "request_id_scheme": "sha256(source_sha256:line_number:original_id)",
+        "rows": 9420,
+        "sha256": "68983266aa0e66aa589562f7c08edbd966f9ba4405e20c105adb43777d2dfbf5",
+        "source_sha256": [
+          "b242d1d9086df3accab57b4c92445d5edd581e12f47e12cea227aa63964c6930",
+          "d23b549f7b69af3647308677bbf76f818a3c226a1c98f9a9f93f09ceee46be87"
+        ],
+        "sources": [
+          "/home/admin/cpfs/wjh/fidelity-prefix-pilot-20260714/private/traces/low1.jsonl",
+          "/home/admin/cpfs/wjh/fidelity-prefix-pilot-20260714/private/traces/high1.jsonl"
+        ]
+      },
+      "selection": {
+        "anchor": 0.48686986110831465,
+        "arrival_order_sha256": "c2ad99986ce558da5901a9c5ec0a00bd69f198c981d8779235f2773a5c87f1c0",
+        "input_length_order_sha256": "9442bfebdc3fab5062dc1f4d688dc28c02afe3fd806c56dd8159f0ac7e6d0b94",
+        "offered_req_s": 8.5,
+        "offered_req_s_per_gpu": 2.125,
+        "request_id_order_sha256": "0bb61dbc9c26875e991d0d4f984134910d37463e5063f86ee960cf4f8aafb771",
+        "selected_count": 2550,
+        "target_count": 2550,
+        "target_req_s_per_gpu": 2.125
+      },
+      "study": "/home/admin/cpfs/wjh/intervention-response-v3-20260714/private/studies/rep1-tp4.json",
+      "study_sha256": "ecfff96e33d458eb1e3b9a6d24386f00cc6f1b19ff926e2ec6320b3f671a7ae3"
+    },
+    "2": {
+      "merged_trace": {
+        "bytes": 337509330,
+        "path": "/home/admin/cpfs/wjh/intervention-response-v3-20260714/private/traces/rep2.jsonl",
+        "request_id_scheme": "sha256(source_sha256:line_number:original_id)",
+        "rows": 9457,
+        "sha256": "f38e8938f6a481fc6725b71b21aa04ff7eaf79783cdfd6e41aa2f074156f00c2",
+        "source_sha256": [
+          "4cbb0baac082bd54af562ce2f39104c5c23b4671672da365a67b1e8c146adf9f",
+          "bb0bcd2564a88000f435f12feb21c7c902eafc9ea5fe916adfe9d1eae47f3f9a"
+        ],
+        "sources": [
+          "/home/admin/cpfs/wjh/fidelity-prefix-pilot-20260714/private/traces/low2.jsonl",
+          "/home/admin/cpfs/wjh/fidelity-prefix-pilot-20260714/private/traces/high2.jsonl"
+        ]
+      },
+      "selection": {
+        "anchor": 0.4825698948735577,
+        "arrival_order_sha256": "b9fc12cf3f86bc8a79bee65296e65aa2b8bf2aeca46b2887094c669adcbb9a00",
+        "input_length_order_sha256": "d8d4bd6fc8ba852a45605b673b6b3e4f33b58f459e69f2a032d226ee175b074e",
+        "offered_req_s": 8.5,
+        "offered_req_s_per_gpu": 2.125,
+        "request_id_order_sha256": "56a0616b6b54abafd37875c7cb25f8639afef2706ccc55dfbe568f45859ea382",
+        "selected_count": 2550,
+        "target_count": 2550,
+        "target_req_s_per_gpu": 2.125
+      },
+      "study": "/home/admin/cpfs/wjh/intervention-response-v3-20260714/private/studies/rep2-tp4.json",
+      "study_sha256": "d92a576db031db24bb58f354ea725d7f7567cb76699d387117ac5a6c9317bbb9"
+    },
+    "3": {
+      "merged_trace": {
+        "bytes": 337450256,
+        "path": "/home/admin/cpfs/wjh/intervention-response-v3-20260714/private/traces/rep3.jsonl",
+        "request_id_scheme": "sha256(source_sha256:line_number:original_id)",
+        "rows": 9431,
+        "sha256": "3094084b0bb20cc02eecf465091a5c919b4e5b112f704cdc36a563d1efdcee46",
+        "source_sha256": [
+          "1f7ececb142f9a363d2d1ca25eb7b8488b2cc319a51b55faa384f2a3d51f2142",
+          "6f326234791e1cff4ff866bface0d097d0d6e3844eebb1c97653d8e9c35e9397"
+        ],
+        "sources": [
+          "/home/admin/cpfs/wjh/fidelity-prefix-pilot-20260714/private/traces/low3.jsonl",
+          "/home/admin/cpfs/wjh/fidelity-prefix-pilot-20260714/private/traces/high3.jsonl"
+        ]
+      },
+      "selection": {
+        "anchor": 0.48664343020532463,
+        "arrival_order_sha256": "efce7339e22d3618cb4d55e6b55bfddb2c563c18faba2a992d5829c13e3f55e9",
+        "input_length_order_sha256": "0792b05fff6729fbd92ab2bb4cb6d31bea7799e232ad42772936bc06efbafb54",
+        "offered_req_s": 8.5,
+        "offered_req_s_per_gpu": 2.125,
+        "request_id_order_sha256": "2a2fabe2c4cf176aeb7e0d32fb8e7dbb1f27429a2e7a0cd18d7d186f23096f19",
+        "selected_count": 2550,
+        "target_count": 2550,
+        "target_req_s_per_gpu": 2.125
+      },
+      "study": "/home/admin/cpfs/wjh/intervention-response-v3-20260714/private/studies/rep3-tp4.json",
+      "study_sha256": "fb8ffe256dace32f4ca8a8d49b662d98c3b69b94ecc8fa826e43068b238884ab"
+    }
+  },
+  "sanity": {
+    "invariants": {
+      "all_repetition_orders_are_permutations": true,
+      "five_unique_configs": true,
+      "same_load_all_repetitions": true,
+      "shared_endpoint_reused_by_both_regimes": true,
+      "three_disjoint_repetitions": true
+    },
+    "red_flags": []
+  },
+  "schema": "action-aware-constraint-pilot-manifest-v1",
+  "source": {
+    "base_manifest": "/home/gahow/phd/aituner/runs/intervention-response-v2/pilot-manifest-v3.json",
+    "base_manifest_sha256": "273db1181dcc9d6b64439650d0642ebe553b12e6aa9adebfbe3758a7977e5611",
+    "source_trace": "/home/admin/cpfs/wjh/aituner/aituner/trace_windows/traces/chat_w20260312_1000.jsonl",
+    "source_trace_sha256": "875ba869775deb78086477919f03b322da14e2673c7d070e26528c4190912757",
+    "window_id": "chat_w20260312_1000"
+  },
+  "status": "PASS"
+}
diff --git a/runs/action-aware-v0/pilot_controller.py b/runs/action-aware-v0/pilot_controller.py
index 0492116..14668f9 100644
--- a/runs/action-aware-v0/pilot_controller.py
+++ b/runs/action-aware-v0/pilot_controller.py
@@ -334,6 +334,30 @@ def validate_result(
             raise RuntimeError(f"selection hash mismatch {result_key}: {role}")
 
 
+def burnin_gate(
+    result: Mapping[str, Any],
+    *,
+    expected_count: int,
+    maximum_elapsed_s: float,
+) -> dict[str, Any]:
+    if result.get("kind") != "anchor":
+        raise RuntimeError("burnin gate received a non-anchor result")
+    if int(result["selection"]["count"]) != expected_count:
+        raise RuntimeError("burnin gate received the wrong request set")
+    elapsed_s = float(result["interval"]["elapsed_s"])
+    summary = {
+        "elapsed_s": elapsed_s,
+        "pass_rate": float(result["pass_rate"]),
+        "feasible": bool(result["feasible"]),
+    }
+    if elapsed_s > maximum_elapsed_s:
+        raise RuntimeError(
+            f"burnin throughput gate failed: {elapsed_s:.3f}s > "
+            f"{maximum_elapsed_s:.3f}s"
+        )
+    return summary
+
+
 def run_client(
     *,
     entry: dict[str, Any],
@@ -458,7 +482,7 @@ def execute_session(
         first = manifest["repetitions"][str(config["repetition_order"][0])]
         session_state["status"] = "warmup"
         atomic_json(state_path, state)
-        burnin_result = run_client(
+        run_client(
             entry=entry,
             config=config,
             role="warmup",
@@ -472,7 +496,7 @@ def execute_session(
         session_state["status"] = "burnin"
         atomic_json(state_path, state)
         burnin = manifest["burnin"]
-        run_client(
+        burnin_result = run_client(
             entry=entry,
             config=config,
             role="burnin",
@@ -482,19 +506,12 @@ def execute_session(
             state=state,
             timeout_s=float(manifest["engine"]["client_timeout_s"]),
         )
-        burnin_elapsed_s = float(burnin_result["interval"]["elapsed_s"])
-        session_state["burnin"] = {
-            "elapsed_s": burnin_elapsed_s,
-            "pass_rate": float(burnin_result["pass_rate"]),
-            "feasible": bool(burnin_result["feasible"]),
-        }
+        session_state["burnin"] = burnin_gate(
+            burnin_result,
+            expected_count=int(burnin["selected_count"]),
+            maximum_elapsed_s=float(manifest["engine"]["burnin_max_elapsed_s"]),
+        )
         atomic_json(state_path, state)
-        burnin_limit_s = float(manifest["engine"]["burnin_max_elapsed_s"])
-        if burnin_elapsed_s > burnin_limit_s:
-            raise RuntimeError(
-                f"burnin throughput gate failed: {burnin_elapsed_s:.3f}s > "
-                f"{burnin_limit_s:.3f}s"
-            )
         session_state["status"] = "measured"
         atomic_json(state_path, state)
         for repetition in config["repetition_order"]:
diff --git a/runs/action-aware-v0/prior-attempts-v2.json b/runs/action-aware-v0/prior-attempts-v2.json
new file mode 100644
index 0000000..3faf060
--- /dev/null
+++ b/runs/action-aware-v0/prior-attempts-v2.json
@@ -0,0 +1,24 @@
+{
+  "global_hard_cap_h20_hours": 8.0,
+  "invariants": {
+    "all_gpus_idle_after_each_stop": true,
+    "no_completed_measured_runs": true,
+    "no_prior_runtime_data_reused": true
+  },
+  "prior_attempt_h20_hours": 0.7043978426191542,
+  "schema": "action-aware-prior-attempts-v2",
+  "stops": [
+    {
+      "artifact": "/home/admin/cpfs/wjh/action-aware-constraint-v0-20260714/operational-stop-v0.json",
+      "h20_hours": 0.38598689953486126,
+      "reason": "MBBT256 burn-in remained throughput-backlogged",
+      "stage": "burnin"
+    },
+    {
+      "artifact": "/home/admin/cpfs/wjh/action-aware-constraint-v1-20260714/operational-stop-v1.json",
+      "h20_hours": 0.31841094308429296,
+      "reason": "controller passed the warmup result to the burn-in gate",
+      "stage": "first measured run in flight; zero measured results completed"
+    }
+  ]
+}
diff --git a/runs/action-aware-v0/test_pilot.py b/runs/action-aware-v0/test_pilot.py
index c46af88..c2867d9 100644
--- a/runs/action-aware-v0/test_pilot.py
+++ b/runs/action-aware-v0/test_pilot.py
@@ -201,6 +201,32 @@ def main() -> None:
         "--max-num-batched-tokens 2048"
         in revised_plan["sessions"][0]["commands"]["server"]
     )
+    accepted_burnin = {
+        "kind": "anchor",
+        "selection": {"count": 510},
+        "interval": {"elapsed_s": 61.25},
+        "pass_rate": 0.5,
+        "feasible": False,
+    }
+    assert controller.burnin_gate(
+        accepted_burnin, expected_count=510, maximum_elapsed_s=90.0
+    )["elapsed_s"] == 61.25
+    warmup = copy.deepcopy(accepted_burnin)
+    warmup["kind"] = "warmup"
+    try:
+        controller.burnin_gate(warmup, expected_count=510, maximum_elapsed_s=90.0)
+    except RuntimeError as error:
+        assert "non-anchor" in str(error)
+    else:
+        raise AssertionError("warmup incorrectly passed the burnin gate")
+    slow = copy.deepcopy(accepted_burnin)
+    slow["interval"]["elapsed_s"] = 91.0
+    try:
+        controller.burnin_gate(slow, expected_count=510, maximum_elapsed_s=90.0)
+    except RuntimeError as error:
+        assert "throughput gate failed" in str(error)
+    else:
+        raise AssertionError("slow burnin incorrectly passed the throughput gate")
     print("action-aware constraint pilot: PASS")