feat: add real tmux session manager

apps/worker/src/index.test.ts

@@ -220,6 +220,46 @@ describe("startWorker", () => {
     });
     await next.shutdown();
   });
+
+  it("drains SessionManager resources when Temporal worker shutdown fails", async () => {
+    client = createDbClient(databaseUrl);
+    const workspaceRoot = realpathSync(mkdtempSync(join(tmpdir(), "devflow-worker-shutdown-")));
+    tempRoots.push(workspaceRoot);
+    const connection = countingConnection();
+    const worker = await startWorkerWhenLockFree({
+      config: {
+        DATABASE_URL: databaseUrl,
+        LOG_LEVEL: "info",
+        TEMPORAL_ADDRESS: "localhost:7233",
+        WORKSPACE_ROOT: workspaceRoot,
+        MAX_CONCURRENT_RUNS: 4,
+        backends: [{ id: "fake", enabled: true }],
+      },
+      dbClient: client,
+      recoveryRunIds: [],
+      connectionFactory: async () => connection,
+      workerFactory: async () => failingShutdownWorker(),
+    });
+
+    await expect(worker.shutdown()).rejects.toThrow("worker shutdown failed");
+    expect(connection.closes).toBe(1);
+
+    const next = await startWorkerWhenLockFree({
+      config: {
+        DATABASE_URL: databaseUrl,
+        LOG_LEVEL: "info",
+        TEMPORAL_ADDRESS: "localhost:7233",
+        WORKSPACE_ROOT: workspaceRoot,
+        MAX_CONCURRENT_RUNS: 4,
+        backends: [{ id: "fake", enabled: true }],
+      },
+      dbClient: client,
+      recoveryRunIds: [],
+      connectionFactory: async () => fakeConnection(),
+      workerFactory: async () => fakeWorker(),
+    });
+    await next.shutdown();
+  });
 });
 
 function fakeConnection() {
@@ -257,6 +297,15 @@ function countingWorker() {
   };
 }
 
+function failingShutdownWorker() {
+  return {
+    run: async () => undefined,
+    shutdown() {
+      throw new Error("worker shutdown failed");
+    },
+  };
+}
+
 async function startWorkerWhenLockFree(options: Parameters<typeof startWorker>[0]) {
   const deadline = Date.now() + 6_000;
   let lastError: unknown;