feat(agent): add frontend action bridge

src/routes/chatAuxiliaryRoutes.ts

@@ -8,6 +8,7 @@ import { type ResultReferenceResolver } from "../results/resolver.js";
 import { RESULT_REFERENCE_KIND } from "../results/store.js";
 import { type SessionMetadataStore } from "../sessions/metadataStore.js";
 import { type SessionUiStateStore } from "../sessions/uiStateStore.js";
+import { type FrontendActionCoordinator } from "../frontendAction/coordinator.js";
 import { toActorKey, toProjectKey } from "../utils/fileStore.js";
 import {
   type ActiveRun,
@@ -28,6 +29,7 @@ type RegisterAuxiliaryRoutesOptions = {
   sessionBridge: ChatSessionBridge;
   sessionMetadataStore: SessionMetadataStore;
   sessionUiStateStore: SessionUiStateStore;
+  frontendActionCoordinator: FrontendActionCoordinator;
 };
 
 const toSessionUiStateContext = (sessionId: string) => ({
@@ -43,6 +45,7 @@ export const registerChatAuxiliaryRoutes = (
     sessionBridge,
     sessionMetadataStore,
     sessionUiStateStore,
+    frontendActionCoordinator,
   }: RegisterAuxiliaryRoutesOptions,
 ) => {
   chatRouter.get("/render-ref/:render_ref", async (req, res) => {
@@ -93,6 +96,7 @@ export const registerChatAuxiliaryRoutes = (
     }
 
     try {
+      frontendActionCoordinator.cancelSession(parsed.data.session_id);
       const authContext = getLocalAgentContext(req);
       const projectId = authContext.projectId;
       const userId = authContext.userId;