style: Clean up code formatting for improved readability

scripts/backtest_replay.py

@@ -30,8 +30,7 @@ def _parse_balances(raw: str) -> Mapping[str, float]:
 
 
 def main() -> int:
-    parser = argparse.ArgumentParser(
-        description="Run a deterministic replay backtest.")
+    parser = argparse.ArgumentParser(description="Run a deterministic replay backtest.")
     parser.add_argument("--events", type=Path, required=True)
     parser.add_argument("--starting-balances", type=str, default="USD=1000.0")
     parser.add_argument("--trade-capital", type=float, default=100.0)
@@ -56,18 +55,15 @@ def main() -> int:
         started_at=events[0].occurred_at if events else datetime.now(UTC),
     )
     report = asyncio.run(
-        engine.run(events, starting_balances=_parse_balances(
-            args.starting_balances))
+        engine.run(events, starting_balances=_parse_balances(args.starting_balances))
     )
 
     print("Backtest report:")
     print(f"- processed_events: {report.processed_events}")
     print(f"- opportunities_seen: {report.opportunities_seen}")
     print(f"- trades_executed: {report.trades_executed}")
-    print(
-        f"- win_rate: {report.win_rate if report.win_rate is not None else 'n/a'}")
-    print(
-        f"- fill_rate: {report.fill_rate if report.fill_rate is not None else 'n/a'}")
+    print(f"- win_rate: {report.win_rate if report.win_rate is not None else 'n/a'}")
+    print(f"- fill_rate: {report.fill_rate if report.fill_rate is not None else 'n/a'}")
     print(f"- realized_pnl_usd: {report.realized_pnl_usd:.4f}")
     print(f"- max_drawdown_usd: {report.max_drawdown_usd:.4f}")
     print(f"- miss_reasons: {dict(report.miss_reasons)}")

scripts/security_scan.py

@@ -63,16 +63,13 @@ def scan_worktree() -> list[str]:
 
         for rule_name, pattern in PATTERNS:
             if pattern.search(content):
-                findings.append(
-                    f"worktree:{path.relative_to(WORKSPACE)}:{rule_name}")
+                findings.append(f"worktree:{path.relative_to(WORKSPACE)}:{rule_name}")
     return findings
 
 
 def scan_git_history() -> list[str]:
-    cmd = ["git", "-C", str(WORKSPACE), "log", "--all",
-           "-p", "--pretty=format:%H"]
-    completed = subprocess.run(
-        cmd, check=False, capture_output=True, text=True)
+    cmd = ["git", "-C", str(WORKSPACE), "log", "--all", "-p", "--pretty=format:%H"]
+    completed = subprocess.run(cmd, check=False, capture_output=True, text=True)
     if completed.returncode != 0:
         return ["history_scan_failed"]
 

src/arbitrade/backtesting/replay.py

@@ -153,8 +153,7 @@ def _parse_book_levels(raw_levels: Any) -> tuple[BookLevel, ...]:
             or not isinstance(raw_level[1], int | float)
         ):
             raise ValueError("Each level must be [price, volume]")
-        levels.append(BookLevel(price=float(
-            raw_level[0]), volume=float(raw_level[1])))
+        levels.append(BookLevel(price=float(raw_level[0]), volume=float(raw_level[1])))
 
     return tuple(levels)
 
@@ -173,8 +172,7 @@ def load_replay_events(path: Path) -> list[ReplayBookEvent]:
         if not isinstance(timestamp_raw, str) or not isinstance(symbol_raw, str):
             raise ValueError("Each event must include timestamp and symbol")
 
-        occurred_at = datetime.fromisoformat(
-            timestamp_raw.replace("Z", "+00:00")).astimezone(UTC)
+        occurred_at = datetime.fromisoformat(timestamp_raw.replace("Z", "+00:00")).astimezone(UTC)
         events.append(
             ReplayBookEvent(
                 occurred_at=occurred_at,
@@ -208,8 +206,7 @@ class BacktestReplayEngine:
             min_order_size_by_pair=config.min_order_size_by_pair,
         )
         self._pre_trade = PreTradeValidator()
-        self._trade_limits = TradeLimitsGuard(
-            max_concurrent_trades=config.max_concurrent_trades)
+        self._trade_limits = TradeLimitsGuard(max_concurrent_trades=config.max_concurrent_trades)
         self._simulated_rest = _SimulatedRestClient(
             self._clock,
             slippage_bps=config.slippage_bps,
@@ -244,8 +241,7 @@ class BacktestReplayEngine:
         trades_executed = 0
 
         realized_pnl = 0.0
-        equity = float(starting_balances.get(
-            self._config.quote_asset.upper(), 0.0))
+        equity = float(starting_balances.get(self._config.quote_asset.upper(), 0.0))
         peak_equity = equity
         max_drawdown = 0.0
 
@@ -288,8 +284,7 @@ class BacktestReplayEngine:
                 result = await self._sequencer.execute(opportunity)
                 self._trade_limits.close_trade(exposure)
 
-                execution_latencies.append(
-                    self._simulated_rest.last_trade_latency_ms)
+                execution_latencies.append(self._simulated_rest.last_trade_latency_ms)
                 fill_samples.append(self._simulated_rest.last_fill_ratio)
 
                 if not result.success:
@@ -312,8 +307,7 @@ class BacktestReplayEngine:
 
         wins = sum(1 for pnl in realized_samples if pnl > 0.0)
         win_rate = (wins / len(realized_samples)) if realized_samples else None
-        fill_rate = (sum(fill_samples) / len(fill_samples)
-                     ) if fill_samples else None
+        fill_rate = (sum(fill_samples) / len(fill_samples)) if fill_samples else None
 
         return BacktestReport(
             started_at=events[0].occurred_at if events else self._clock.now,

src/arbitrade/runtime/lifecycle.py

@@ -140,8 +140,7 @@ async def restore_runtime_state(app: FastAPI) -> RuntimeRecoveryReport:
         snapshot_at = latest.snapshot_at.isoformat()
         controls.is_running = latest.is_running
         if latest.kill_switch_active:
-            controls.kill_switch.activate(
-                reason=latest.kill_switch_reason or "recovered")
+            controls.kill_switch.activate(reason=latest.kill_switch_reason or "recovered")
         else:
             controls.kill_switch.deactivate()
         controls.mark_updated()
@@ -151,8 +150,7 @@ async def restore_runtime_state(app: FastAPI) -> RuntimeRecoveryReport:
     if open_trades > 0:
         controls.is_running = False
         if not controls.kill_switch.is_active:
-            controls.kill_switch.activate(
-                reason="recovery_open_trades_detected")
+            controls.kill_switch.activate(reason="recovery_open_trades_detected")
         controls.mark_updated()
         restart_guard_active = True
 

tests/test_dashboard.py

@@ -191,8 +191,7 @@ async def test_dashboard_page_and_fragment_and_sse(tmp_path) -> None:
     assert "trade-open" in overview.text
 
     assert overview_stream.status_code == 200
-    assert overview_stream.headers["content-type"].startswith(
-        "text/event-stream")
+    assert overview_stream.headers["content-type"].startswith("text/event-stream")
     assert "event: overview" in overview_stream.text
     assert "trade-open" in overview_stream.text
 
@@ -262,8 +261,7 @@ async def test_dashboard_controls_update_runtime_state_and_config(tmp_path) -> N
     assert app.state.settings.max_trade_capital_usd == 300.0
     assert app.state.settings.max_concurrent_trades == 4
     assert app.state.settings.paper_trading_mode is True
-    assert app.state.dashboard_controls.tradable_pairs == [
-        "BTC/USD", "ETH/BTC"]
+    assert app.state.dashboard_controls.tradable_pairs == ["BTC/USD", "ETH/BTC"]
     assert app.state.dashboard_controls.strategy_mode == "paper"
     assert app.state.dashboard_controls.strategy_profit_threshold == 0.0025
     assert app.state.dashboard_controls.strategy_max_depth_levels == 7
@@ -275,14 +273,10 @@ async def test_dashboard_controls_update_runtime_state_and_config(tmp_path) -> N
     assert audit_recent.status_code == 200
     entries = audit_recent.json()["entries"]
     assert len(entries) >= 4
-    assert any(entry["event_type"] ==
-               "dashboard.control.stop" for entry in entries)
-    assert any(entry["event_type"] ==
-               "dashboard.control.start" for entry in entries)
-    assert any(entry["event_type"] ==
-               "dashboard.control.kill_switch" for entry in entries)
-    assert any(entry["event_type"] ==
-               "dashboard.control.config" for entry in entries)
+    assert any(entry["event_type"] == "dashboard.control.stop" for entry in entries)
+    assert any(entry["event_type"] == "dashboard.control.start" for entry in entries)
+    assert any(entry["event_type"] == "dashboard.control.kill_switch" for entry in entries)
+    assert any(entry["event_type"] == "dashboard.control.config" for entry in entries)
 
 
 async def test_dashboard_controls_emit_alerts(tmp_path) -> None:

tests/unit/test_backtesting_replay.py

@@ -67,13 +67,11 @@ def test_backtest_replay_engine_runs_deterministically() -> None:
     engine = BacktestReplayEngine(
         cycles_by_pair=cycles_by_pair,
         available_pairs=available_pairs,
-        config=BacktestConfig(trade_capital=100.0,
-                              slippage_bps=5.0, execution_latency_ms=10.0),
+        config=BacktestConfig(trade_capital=100.0, slippage_bps=5.0, execution_latency_ms=10.0),
         started_at=started_at,
     )
 
-    report = asyncio.run(engine.run(
-        replay_events, starting_balances={"USD": 1000.0}))
+    report = asyncio.run(engine.run(replay_events, starting_balances={"USD": 1000.0}))
 
     assert report.processed_events == 3
     assert report.opportunities_seen >= 0