fix(bridge): restore labels from session history

Hydrate missing runtime names from persisted session metadata so opened and restored conversations no longer remain titled New session.

test/multi-session-registry.test.js

@@ -177,9 +177,16 @@ test("closing removes desired-open intent, preserves history, and refuses direct
 	await registry.stop();
 });
 
-test("restores durable runtime IDs with two-at-a-time concurrency and preserves command isolation", async () => {
+test("restores durable runtime IDs and history labels with two-at-a-time concurrency", async () => {
 	const paths = await fixture();
 	const firstPath = await sessionFile(paths.sessionRoot, paths.home, "one");
+	await writeFile(
+		firstPath,
+		`${await readFile(firstPath, "utf8")}${JSON.stringify({
+			type: "message",
+			message: { role: "user", content: "Hydrate this session label" },
+		})}\n`,
+	);
 	const secondPath = await sessionFile(paths.sessionRoot, paths.home, "two");
 	const thirdPath = await sessionFile(paths.sessionRoot, paths.home, "three");
 	const firstAdapters = adapterFactory({
@@ -195,6 +202,7 @@ test("restores durable runtime IDs with two-at-a-time concurrency and preserves
 	if (!initial.sessionPath)
 		await firstRegistry.closeSessionRuntime(initial.runtimeId);
 	const one = await firstRegistry.openSessionRuntime(paths.home, firstPath);
+	assert.equal(one.label, "Hydrate this session label");
 	const two = await firstRegistry.openSessionRuntime(paths.home, secondPath);
 	const three = await firstRegistry.openSessionRuntime(paths.home, thirdPath);
 	await firstRegistry.stop();
@@ -241,6 +249,14 @@ test("restores durable runtime IDs with two-at-a-time concurrency and preserves
 		new Set([one.runtimeId, two.runtimeId, three.runtimeId]),
 	);
 	assert.equal(maxActiveStarts, 2);
+	assert.equal(
+		restored
+			.getWorkspace()
+			.directories[0].runtimes.find(
+				(runtime) => runtime.runtimeId === one.runtimeId,
+			)?.label,
+		"Hydrate this session label",
+	);
 	assert.ok(
 		restored
 			.listAgents()