feat: add max open positions and position cap controls to trading dashboard

frontend/src/api/tradingHooks.ts

@@ -22,6 +22,8 @@ export interface TradingEngineStatus {
   portfolio_heat: number;
   portfolio_value: number;
   open_position_count: number;
+  max_open_positions: number;
+  absolute_position_cap: number;
   last_decision_at: string | null;
   micro_trading_enabled: boolean;
   uptime_seconds: number | null;

frontend/src/pages/trading/TradingOverview.tsx

@@ -35,6 +35,8 @@ export function TradingOverview() {
   const resume = useResumeTradingEngine();
   const updateConfig = useUpdateTradingConfig();
   const [selectedTier, setSelectedTier] = useState<string | null>(null);
+  const [maxPositions, setMaxPositions] = useState<number | null>(null);
+  const [positionCap, setPositionCap] = useState<number | null>(null);
 
   if (isLoading) return <LoadingSpinner />;
   if (!status) return <p className="text-gray-500">No trading status available</p>;
@@ -131,6 +133,68 @@ export function TradingOverview() {
         <StatCard label="Portfolio Heat" value={fmtPct(status.portfolio_heat)} />
       </div>
 
+      {/* Position Limits */}
+      <Card>
+        <h2 className="mb-3 text-sm font-medium text-gray-400">Position Limits</h2>
+        <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
+          <div>
+            <label htmlFor="max-positions" className="block text-xs text-gray-500 mb-1">
+              Max Open Positions
+            </label>
+            <div className="flex items-center gap-2">
+              <input
+                id="max-positions"
+                type="number"
+                min={1}
+                max={50}
+                value={maxPositions ?? status.max_open_positions ?? 10}
+                onChange={(e) => setMaxPositions(Number(e.target.value))}
+                className="w-20 rounded-md border border-surface-700 bg-surface-950 px-2 py-1.5 text-sm text-gray-200 focus:border-brand-500 focus:outline-none"
+              />
+              <button
+                onClick={() => {
+                  const val = maxPositions ?? status.max_open_positions ?? 10;
+                  updateConfig.mutate({ max_open_positions: val });
+                }}
+                disabled={updateConfig.isPending}
+                className="rounded-md bg-brand-700 px-3 py-1.5 text-xs font-medium text-white hover:bg-brand-600 disabled:opacity-50"
+              >
+                Apply
+              </button>
+              <span className="text-xs text-gray-500">
+                Current: {status.open_position_count ?? 0} / {status.max_open_positions ?? 10}
+              </span>
+            </div>
+          </div>
+          <div>
+            <label htmlFor="position-cap" className="block text-xs text-gray-500 mb-1">
+              Absolute Position Cap ($)
+            </label>
+            <div className="flex items-center gap-2">
+              <input
+                id="position-cap"
+                type="number"
+                min={10}
+                step={10}
+                value={positionCap ?? status.absolute_position_cap ?? 50}
+                onChange={(e) => setPositionCap(Number(e.target.value))}
+                className="w-24 rounded-md border border-surface-700 bg-surface-950 px-2 py-1.5 text-sm text-gray-200 focus:border-brand-500 focus:outline-none"
+              />
+              <button
+                onClick={() => {
+                  const val = positionCap ?? status.absolute_position_cap ?? 50;
+                  updateConfig.mutate({ absolute_position_cap: val });
+                }}
+                disabled={updateConfig.isPending}
+                className="rounded-md bg-brand-700 px-3 py-1.5 text-xs font-medium text-white hover:bg-brand-600 disabled:opacity-50"
+              >
+                Apply
+              </button>
+            </div>
+          </div>
+        </div>
+      </Card>
+
       {/* Portfolio Heat Gauge */}
       <Card>
         <h2 className="mb-2 text-sm font-medium text-gray-400">Portfolio Heat</h2>

services/trading/app.py

@@ -314,6 +314,8 @@ async def trading_status() -> dict[str, Any]:
         "reserve_pool": reserve_pool,
         "portfolio_heat": portfolio_heat,
         "open_positions": open_positions,
+        "max_open_positions": engine.config.max_open_positions,
+        "absolute_position_cap": engine.config.absolute_position_cap,
         "last_decision_at": None,
     }