feat: add notifications for MacOS using Applescript (#160)

yolo'ed it with codex. Let me know if this looks good to you.

https://github.com/openai/codex/issues/148

tested with:
```
npm run build:dev
```

<img width="377" alt="Screenshot 2025-04-16 at 18 12 01"
src="https://github.com/user-attachments/assets/79aa799b-b0b9-479d-84f1-bfb83d34bfb9"
/>

codex-cli/tests/agent-cancel-early.test.ts

@@ -96,7 +96,7 @@ describe("cancel before first function_call", () => {
       onLoading: () => {},
       getCommandConfirmation: async () => ({ review: "yes" } as any),
       onLastResponseId: () => {},
-      config: { model: "any", instructions: "" },
+      config: { model: "any", instructions: "", notify: false },
     });
 
     // Start first run.

codex-cli/tests/agent-cancel-prev-response.test.ts

@@ -104,7 +104,7 @@ describe("cancel clears previous_response_id", () => {
       onLoading: () => {},
       getCommandConfirmation: async () => ({ review: "yes" } as any),
       onLastResponseId: () => {},
-      config: { model: "any", instructions: "" },
+      config: { model: "any", instructions: "", notify: false },
     });
 
     // First run that triggers a function_call, but we will cancel *before* the

codex-cli/tests/agent-cancel-race.test.ts

@@ -95,7 +95,7 @@ describe("Agent cancellation race", () => {
       additionalWritableRoots: [],
       model: "any",
       instructions: "",
-      config: { model: "any", instructions: "" },
+      config: { model: "any", instructions: "", notify: false },
       approvalPolicy: { mode: "auto" } as any,
       onItem: (i) => items.push(i),
       onLoading: () => {},

codex-cli/tests/agent-cancel.test.ts

@@ -89,7 +89,7 @@ describe("Agent cancellation", () => {
     const agent = new AgentLoop({
       model: "any",
       instructions: "",
-      config: { model: "any", instructions: "" },
+      config: { model: "any", instructions: "", notify: false },
       approvalPolicy: { mode: "auto" } as any,
       additionalWritableRoots: [],
       onItem: (item) => {
@@ -140,7 +140,7 @@ describe("Agent cancellation", () => {
       additionalWritableRoots: [],
       model: "any",
       instructions: "",
-      config: { model: "any", instructions: "" },
+      config: { model: "any", instructions: "", notify: false },
       approvalPolicy: { mode: "auto" } as any,
       onItem: (item) => received.push(item),
       onLoading: () => {},

codex-cli/tests/agent-interrupt-continue.test.ts

@@ -41,6 +41,7 @@ describe("Agent interrupt and continue", () => {
       config: {
         model: "test-model",
         instructions: "",
+        notify: false,
       },
       onItem: (item) => received.push(item),
       onLoading: (loading) => {

codex-cli/tests/agent-terminate.test.ts

@@ -111,7 +111,7 @@ describe("Agent terminate (hard cancel)", () => {
     const agent = new AgentLoop({
       model: "any",
       instructions: "",
-      config: { model: "any", instructions: "" },
+      config: { model: "any", instructions: "", notify: false },
       approvalPolicy: { mode: "auto" } as any,
       additionalWritableRoots: [],
       onItem: (item) => received.push(item),
@@ -147,7 +147,7 @@ describe("Agent terminate (hard cancel)", () => {
     const agent = new AgentLoop({
       model: "any",
       instructions: "",
-      config: { model: "any", instructions: "" },
+      config: { model: "any", instructions: "", notify: false },
       approvalPolicy: { mode: "auto" } as any,
       additionalWritableRoots: [],
       onItem: () => {},

codex-cli/tests/config.test.tsx

@@ -68,6 +68,7 @@ test("saves and loads config correctly", () => {
   const testConfig = {
     model: "test-model",
     instructions: "test instructions",
+    notify: false,
   };
   saveConfig(testConfig, testConfigPath, testInstructionsPath);