Add GTL price-traffic chart diagnostic

frontend/src/lib/exitPlan.ts

@@ -2,7 +2,8 @@
  * What actually closes a trade.
  *
  * The setup's `target` is NOT an exit under the production policy: it is a
- * screening artifact — the nearest S/R level, used to compute the R:R and
+ * screening artifact — the headline Gate Target Ladder proposal, used to
+ * compute the R:R and
  * probability that admit the setup through the activation gate. The live exit
  * (`paper_trade_service.resolve_open_trades`) never reads it; `atr_trailing`
  * closes on the initial stop, a trailing stop, or the max hold.

frontend/src/lib/types.ts

@@ -604,6 +604,22 @@ export interface SRLevelResponse {
   count: number;
 }
 
+export interface GateTargetLevel {
+  price_level: number;
+  type: 'support' | 'resistance';
+  strength: number;
+  detection_method: string;
+  sources: string[];
+  traffic_count: number;
+}
+
+export interface GateTargetLadderResponse {
+  symbol: string;
+  levels: GateTargetLevel[];
+  count: number;
+  lookback_bars: number;
+}
+
 // Sentiment
 export interface CitationItem {
   url: string;