feat: hook up agent acp setup to electron (#181)

This does a lot of stuff: it fixes a bunch of mistakes I made in the previous PRs regarding how we handle ACP.

notably:

- the acp session id is now the task run id
- for every action taken via ACP, we now write to S3 instead of manually appending (both client and agent)

Note: this does _not_ yet support polling through cloud, we can do that in a separate PR. The UI is also very rough and will be refactored in another PR. We'll also then pass through the actual prompt we use in the task description, instead of requiring the user to input something.

![image.png](https://app.graphite.com/user-attachments/assets/b0e62d96-c919-40f3-b62a-4113a5436127.png)

Author: jonathanlab

apps/array/src/api/generated.ts

@@ -12,7 +12,14 @@ import {
 } from "electron";
 import "./lib/logger";
 import { ANALYTICS_EVENTS } from "../types/analytics.js";
-import { registerAgentIpc, type TaskController } from "./services/agent.js";
+import {
+  cleanupAgentSessions,
+  registerAgentIpc,
+} from "./services/session-manager.js";
+
+// Legacy type kept for backwards compatibility with taskControllers map
+type TaskController = unknown;
+
 import { setupAgentHotReload } from "./services/dev-reload.js";
 import { registerFileWatcherIpc } from "./services/fileWatcher.js";
 import { registerFoldersIpc } from "./services/folders.js";
@@ -210,6 +217,14 @@ app.on("window-all-closed", async () => {
   }
 });
 
+app.on("before-quit", async (event) => {
+  event.preventDefault();
+  await cleanupAgentSessions();
+  trackAppEvent(ANALYTICS_EVENTS.APP_QUIT);
+  await shutdownPostHog();
+  app.exit(0);
+});
+
 app.on("activate", () => {
   if (mainWindow === null) {
     createWindow();

apps/array/src/main/index.ts

@@ -128,10 +128,37 @@ contextBridge.exposeInMainWorld("electronAPI", {
     ipcRenderer.invoke("clear-repo-file-cache", repoPath),
   agentStart: async (
     params: AgentStartParams,
-  ): Promise<{ taskId: string; channel: string }> =>
+  ): Promise<{ sessionId: string; channel: string }> =>
     ipcRenderer.invoke("agent-start", params),
-  agentCancel: async (taskId: string): Promise<boolean> =>
-    ipcRenderer.invoke("agent-cancel", taskId),
+  agentPrompt: async (
+    sessionId: string,
+    text: string,
+  ): Promise<{ stopReason: string }> =>
+    ipcRenderer.invoke("agent-prompt", sessionId, text),
+  agentCancel: async (sessionId: string): Promise<boolean> =>
+    ipcRenderer.invoke("agent-cancel", sessionId),
+  agentListSessions: async (
+    taskId?: string,
+  ): Promise<
+    Array<{
+      sessionId: string;
+      acpSessionId: string;
+      channel: string;
+      taskId: string;
+    }>
+  > => ipcRenderer.invoke("agent-list-sessions", taskId),
+  agentLoadSession: async (sessionId: string, cwd: string): Promise<boolean> =>
+    ipcRenderer.invoke("agent-load-session", sessionId, cwd),
+  agentReconnect: async (params: {
+    taskId: string;
+    taskRunId: string;
+    repoPath: string;
+    apiKey: string;
+    apiHost: string;
+    projectId: number;
+    logUrl?: string;
+  }): Promise<{ sessionId: string; channel: string } | null> =>
+    ipcRenderer.invoke("agent-reconnect", params),
   onAgentEvent: (
     channel: string,
     listener: (payload: unknown) => void,