feat: integrate Pi backend and Pi Web

pi/packages/coding-agent/test/suite/regressions/3686-session-name-event.test.ts

@@ -0,0 +1,61 @@
+import { afterEach, describe, expect, it } from "vitest";
+import type { ExtensionAPI } from "../../../src/index.ts";
+import { createHarness, type Harness } from "../harness.ts";
+
+describe("regression #3686: session name changes emit an event", () => {
+	const harnesses: Harness[] = [];
+
+	afterEach(() => {
+		while (harnesses.length > 0) {
+			harnesses.pop()?.cleanup();
+		}
+	});
+
+	it("emits session_info_changed when AgentSession.setSessionName is called", async () => {
+		const harness = await createHarness();
+		harnesses.push(harness);
+
+		harness.session.setSessionName("hello world");
+
+		expect(harness.sessionManager.getSessionName()).toBe("hello world");
+		expect(harness.eventsOfType("session_info_changed").map((event) => event.name)).toEqual(["hello world"]);
+	});
+
+	it("emits session_info_changed when an extension calls pi.setSessionName", async () => {
+		let api: ExtensionAPI | undefined;
+		const harness = await createHarness({
+			extensionFactories: [
+				(pi) => {
+					api = pi;
+				},
+			],
+		});
+		harnesses.push(harness);
+
+		api?.setSessionName("from extension");
+
+		expect(harness.sessionManager.getSessionName()).toBe("from extension");
+		expect(harness.eventsOfType("session_info_changed").map((event) => event.name)).toEqual(["from extension"]);
+	});
+
+	it("emits session_info_changed to extensions", async () => {
+		let api: ExtensionAPI | undefined;
+		const events: Array<{ name: string | undefined }> = [];
+		const harness = await createHarness({
+			extensionFactories: [
+				(pi) => {
+					api = pi;
+					pi.on("session_info_changed", (event) => {
+						events.push({ name: event.name });
+					});
+				},
+			],
+		});
+		harnesses.push(harness);
+
+		api?.setSessionName("first");
+		harness.session.setSessionName("second");
+
+		expect(events).toEqual([{ name: "first" }, { name: "second" }]);
+	});
+});