feat(smart-proxy): add typed Rust config serialization and regex header contract coverage

ts/proxies/smart-proxy/route-preprocessor.ts

@@ -1,5 +1,6 @@
 import type { IRouteConfig, IRouteAction, IRouteTarget } from './models/route-types.js';
-import { logger } from '../../core/utils/logger.js';
+import type { IRustRouteConfig } from './models/rust-types.js';
+import { serializeRouteForRust } from './utils/rust-config.js';
 
 /**
  * Preprocesses routes before sending them to Rust.
@@ -24,7 +25,7 @@ export class RoutePreprocessor {
    * - Non-serializable fields are stripped
    * - Original routes are preserved in the local map for handler lookup
    */
-  public preprocessForRust(routes: IRouteConfig[]): IRouteConfig[] {
+  public preprocessForRust(routes: IRouteConfig[]): IRustRouteConfig[] {
     this.originalRoutes.clear();
     return routes.map((route, index) => this.preprocessRoute(route, index));
   }
@@ -43,7 +44,7 @@ export class RoutePreprocessor {
     return new Map(this.originalRoutes);
   }
 
-  private preprocessRoute(route: IRouteConfig, index: number): IRouteConfig {
+  private preprocessRoute(route: IRouteConfig, index: number): IRustRouteConfig {
     const routeKey = route.name || route.id || `route_${index}`;
 
     // Check if this route needs TS-side handling
@@ -57,7 +58,7 @@ export class RoutePreprocessor {
     // Create a clean copy for Rust
     const cleanRoute: IRouteConfig = {
       ...route,
-      action: this.cleanAction(route.action, routeKey, needsTsHandling),
+      action: this.cleanAction(route.action, needsTsHandling),
     };
 
     // Ensure we have a name for handler lookup
@@ -65,7 +66,7 @@ export class RoutePreprocessor {
       cleanRoute.name = routeKey;
     }
 
-    return cleanRoute;
+    return serializeRouteForRust(cleanRoute);
   }
 
   private routeNeedsTsHandling(route: IRouteConfig): boolean {
@@ -91,15 +92,16 @@ export class RoutePreprocessor {
     return false;
   }
 
-  private cleanAction(action: IRouteAction, routeKey: string, needsTsHandling: boolean): IRouteAction {
-    const cleanAction: IRouteAction = { ...action };
+  private cleanAction(action: IRouteAction, needsTsHandling: boolean): IRouteAction {
+    let cleanAction: IRouteAction = { ...action };
 
     if (needsTsHandling) {
       // Convert to socket-handler type for Rust (Rust will relay back to TS)
-      cleanAction.type = 'socket-handler';
-      // Remove the JS handlers (not serializable)
-      delete (cleanAction as any).socketHandler;
-      delete (cleanAction as any).datagramHandler;
+      const { socketHandler: _socketHandler, datagramHandler: _datagramHandler, ...serializableAction } = cleanAction;
+      cleanAction = {
+        ...serializableAction,
+        type: 'socket-handler',
+      };
     }
 
     // Clean targets - replace functions with static values