diff --git a/docs/ouroboros/80_implementation_audit.md b/docs/ouroboros/80_implementation_audit.md
index 9eb0c5a..eb3d23a 100644
--- a/docs/ouroboros/80_implementation_audit.md
+++ b/docs/ouroboros/80_implementation_audit.md
@@ -35,7 +35,7 @@ Updated: 2026-03-02
 | REQ-V2-004 | 4중 청산 로직 (Hard/BE/ATR Trailing/Model) | `src/strategy/exit_rules.py` | ⚠️ 부분 (`#369`) |
 | REQ-V2-005 | Triple Barrier 라벨링 | `src/analysis/triple_barrier.py` | ✅ 완료 |
 | REQ-V2-006 | Walk-Forward + Purge/Embargo 검증 | `src/analysis/walk_forward_split.py` | ✅ 완료 |
-| REQ-V2-007 | 비용/슬리피지/체결실패 모델 필수 | `src/analysis/backtest_cost_guard.py` | ⚠️ 부분 (`#368`) |
+| REQ-V2-007 | 비용/슬리피지/체결실패 모델 필수 | `src/analysis/backtest_cost_guard.py`, `src/analysis/backtest_pipeline.py` | ✅ 완료 |
 | REQ-V2-008 | Kill Switch 실행 순서 (Block→Cancel→Refresh→Reduce→Snapshot) | `src/core/kill_switch.py` | ⚠️ 부분 (`#377`) |
 
 ### 1.3 v3 구현 상태: 부분 완료 (2026-03-02 기준)
diff --git a/src/analysis/backtest_cost_guard.py b/src/analysis/backtest_cost_guard.py
index ae0d729..3215c90 100644
--- a/src/analysis/backtest_cost_guard.py
+++ b/src/analysis/backtest_cost_guard.py
@@ -45,6 +45,7 @@ def validate_backtest_cost_model(
         raise ValueError(
             f"missing failure_rate_by_session for sessions: {', '.join(missing_failure)}"
         )
+
     missing_partial_fill = [s for s in required_sessions if s not in partial_fill]
     if missing_partial_fill:
         raise ValueError(
diff --git a/src/analysis/backtest_pipeline.py b/src/analysis/backtest_pipeline.py
index da39cc5..ad8940e 100644
--- a/src/analysis/backtest_pipeline.py
+++ b/src/analysis/backtest_pipeline.py
@@ -56,6 +56,10 @@ class BacktestFoldResult:
     train_label_distribution: dict[int, int]
     test_label_distribution: dict[int, int]
     baseline_scores: list[BaselineScore]
+    execution_adjusted_avg_return_bps: float
+    execution_adjusted_trade_count: int
+    execution_rejected_count: int
+    execution_partial_count: int
 
 
 @dataclass(frozen=True)
@@ -90,6 +94,14 @@ def run_v2_backtest_pipeline(
         else sorted({bar.session_id for bar in bars})
     )
     validate_backtest_cost_model(model=cost_model, required_sessions=resolved_sessions)
+    execution_model = BacktestExecutionModel(
+        ExecutionAssumptions(
+            slippage_bps_by_session=cost_model.slippage_bps_by_session or {},
+            failure_rate_by_session=cost_model.failure_rate_by_session or {},
+            partial_fill_rate_by_session=cost_model.partial_fill_rate_by_session or {},
+            seed=0,
+        )
+    )
 
     highs = [float(bar.high) for bar in bars]
     lows = [float(bar.low) for bar in bars]
@@ -142,8 +154,32 @@ def run_v2_backtest_pipeline(
         if not test_labels:
             continue
         execution_model = _build_execution_model(cost_model=cost_model, fold_seed=fold_idx)
+        execution_return_model = _build_execution_model(
+            cost_model=cost_model,
+            fold_seed=fold_idx,
+        )
         b0_pred = _baseline_b0_pred(train_labels)
         m1_pred = _m1_pred(train_labels)
+        execution_returns_bps: list[float] = []
+        execution_rejected = 0
+        execution_partial = 0
+        for rel_idx in fold.test_indices:
+            entry_bar_index = normalized_entries[rel_idx]
+            bar = bars[entry_bar_index]
+            trade = _simulate_execution_adjusted_return_bps(
+                execution_model=execution_return_model,
+                bar=bar,
+                label=ordered_labels[rel_idx],
+                side=side,
+                spec=triple_barrier_spec,
+                commission_bps=float(cost_model.commission_bps or 0.0),
+            )
+            if trade["status"] == "REJECTED":
+                execution_rejected += 1
+                continue
+            execution_returns_bps.append(float(trade["return_bps"]))
+            if trade["status"] == "PARTIAL":
+                execution_partial += 1
         fold_results.append(
             BacktestFoldResult(
                 fold_index=fold_idx,
@@ -189,6 +225,12 @@ def run_v2_backtest_pipeline(
                         ),
                     ),
                 ],
+                execution_adjusted_avg_return_bps=(
+                    mean(execution_returns_bps) if execution_returns_bps else 0.0
+                ),
+                execution_adjusted_trade_count=len(execution_returns_bps),
+                execution_rejected_count=execution_rejected,
+                execution_partial_count=execution_partial,
             )
         )
 
@@ -294,3 +336,58 @@ def _build_run_id(*, n_entries: int, n_folds: int, sessions: Sequence[str]) -> s
 def fold_has_leakage(fold: WalkForwardFold) -> bool:
     """Utility for tests/verification: True when train/test overlap exists."""
     return bool(set(fold.train_indices).intersection(fold.test_indices))
+
+
+def _simulate_execution_adjusted_return_bps(
+    *,
+    execution_model: BacktestExecutionModel,
+    bar: BacktestBar,
+    label: int,
+    side: int,
+    spec: TripleBarrierSpec,
+    commission_bps: float,
+) -> dict[str, float | str]:
+    qty = 100
+    entry_req = ExecutionRequest(
+        side="BUY" if side == 1 else "SELL",
+        session_id=bar.session_id,
+        qty=qty,
+        reference_price=float(bar.close),
+    )
+    entry_fill = execution_model.simulate(entry_req)
+    if entry_fill.status == "REJECTED":
+        return {"status": "REJECTED", "return_bps": 0.0}
+
+    exit_qty = entry_fill.filled_qty
+    if label == 1:
+        gross_return_bps = spec.take_profit_pct * 10000.0
+    elif label == -1:
+        gross_return_bps = -spec.stop_loss_pct * 10000.0
+    else:
+        gross_return_bps = 0.0
+
+    if side == 1:
+        exit_price = float(bar.close) * (1.0 + gross_return_bps / 10000.0)
+    else:
+        exit_price = float(bar.close) * (1.0 - gross_return_bps / 10000.0)
+
+    exit_req = ExecutionRequest(
+        side="SELL" if side == 1 else "BUY",
+        session_id=bar.session_id,
+        qty=exit_qty,
+        reference_price=max(0.01, exit_price),
+    )
+    exit_fill = execution_model.simulate(exit_req)
+    if exit_fill.status == "REJECTED":
+        return {"status": "REJECTED", "return_bps": 0.0}
+
+    fill_ratio = min(entry_fill.filled_qty, exit_fill.filled_qty) / qty
+    cost_bps = (
+        float(entry_fill.slippage_bps)
+        + float(exit_fill.slippage_bps)
+        + (2.0 * float(commission_bps))
+    )
+    net_return_bps = (gross_return_bps * fill_ratio) - cost_bps
+    is_partial = entry_fill.status == "PARTIAL" or exit_fill.status == "PARTIAL"
+    status = "PARTIAL" if is_partial else "FILLED"
+    return {"status": status, "return_bps": net_return_bps}
diff --git a/tests/test_backtest_pipeline_integration.py b/tests/test_backtest_pipeline_integration.py
index d63a540..9f05b82 100644
--- a/tests/test_backtest_pipeline_integration.py
+++ b/tests/test_backtest_pipeline_integration.py
@@ -73,6 +73,9 @@ def test_pipeline_happy_path_returns_fold_and_artifact_contract() -> None:
         for score in fold.baseline_scores:
             assert 0.0 <= score.accuracy <= 1.0
             assert 0.0 <= score.cost_adjusted_accuracy <= 1.0
+        assert fold.execution_adjusted_trade_count >= 0
+        assert fold.execution_rejected_count >= 0
+        assert fold.execution_partial_count >= 0
 
 
 def test_pipeline_cost_guard_fail_fast() -> None:
@@ -211,3 +214,7 @@ def test_pipeline_fold_scores_reflect_cost_and_execution_effects() -> None:
     optimistic_score = optimistic_out.folds[0].baseline_scores[1].cost_adjusted_accuracy
     conservative_score = conservative_out.folds[0].baseline_scores[1].cost_adjusted_accuracy
     assert conservative_score < optimistic_score
+
+    optimistic_avg_return = optimistic_out.folds[0].execution_adjusted_avg_return_bps
+    conservative_avg_return = conservative_out.folds[0].execution_adjusted_avg_return_bps
+    assert conservative_avg_return < optimistic_avg_return
diff --git a/workflow/session-handover.md b/workflow/session-handover.md
index a3fd61b..bdd2d5a 100644
--- a/workflow/session-handover.md
+++ b/workflow/session-handover.md
@@ -89,3 +89,19 @@
 - next_ticket: #316
 - process_gate_checked: process_ticket=#306,#308 merged_to_feature_branch=yes
 - risks_or_notes: 모니터 판정을 liveness 중심에서 policy invariant(FORBIDDEN) 중심으로 전환
+
+### 2026-03-01 | session=codex-v3-stream-next-ticket
+- branch: feature/v3-session-policy-stream
+- docs_checked: docs/workflow.md, docs/commands.md, docs/agent-constraints.md
+- open_issues_reviewed: #368, #369, #370, #371, #374, #375, #376, #377, #381
+- next_ticket: #368
+- process_gate_checked: process_ticket=#306,#308 merged_to_feature_branch=yes
+- risks_or_notes: 비블로킹 소견은 합당성(정확성/안정성/유지보수성) 기준으로 반영하고, 미반영 시 근거를 코멘트로 남긴다.
+
+### 2026-03-01 | session=codex-issue368-start
+- branch: feature/issue-368-backtest-cost-execution
+- docs_checked: docs/workflow.md, docs/commands.md, docs/agent-constraints.md
+- open_issues_reviewed: #368
+- next_ticket: #368
+- process_gate_checked: process_ticket=#306,#308 merged_to_feature_branch=yes
+- risks_or_notes: TASK-V2-012 구현 갭 보완을 위해 cost guard + execution-adjusted fold metric + 회귀 테스트를 함께 반영한다.