fix: reduce runner command poll latency

src/selftest/cases/20-runner-k8s-job.ts

@@ -156,6 +156,7 @@ function assertRunnerJobUsesWritableCodexHome(manifest: JsonRecord, expectedCode
   assert.equal(value("CODEX_HOME"), expectedCodexHome);
   assert.equal(value("AGENTRUN_CODEX_SECRET_HOME"), projectionPath);
   assert.equal(value("AGENTRUN_RUNNER_IDLE_TIMEOUT_MS"), "600000");
+  assert.equal(value("AGENTRUN_RUNNER_POLL_INTERVAL_MS"), "250");
   assert.equal(value("AGENTRUN_RUNNER_ONE_SHOT"), undefined);
   assert.notEqual(value("CODEX_HOME"), value("AGENTRUN_CODEX_SECRET_HOME"));
 }

src/selftest/cases/50-hwlab-manual-dispatch.ts

@@ -100,6 +100,11 @@ console.log(JSON.stringify({ apiVersion: manifest.apiVersion, kind: manifest.kin
     assert.equal(starts.length, 1, "same-run multiturn runner must keep one codex app-server process alive instead of restarting per command");
     const multiEventsResponse = await client.get(`/api/v1/runs/${multiTurn.runId}/events?afterSeq=0&limit=200`) as { items?: Array<{ type?: string; payload?: JsonRecord }> };
     const multiEvents = multiEventsResponse.items ?? [];
+    const secondCommandCreatedAt = await commandCreatedAt(client, multiTurn.runId, secondCommand.id);
+    const reuseEvent = multiEvents.find((event) => event.type === "backend_status" && event.payload?.phase === "codex-app-server:reused" && event.payload?.commandId === secondCommand.id);
+    assert.ok(secondCommandCreatedAt, "second command must expose createdAt for pickup latency assertion");
+    assert.ok(reuseEvent?.payload, "second command must produce codex-app-server:reused event");
+    assert.ok(Date.parse(String((reuseEvent as JsonRecord).createdAt ?? "")) - Date.parse(secondCommandCreatedAt) < 1_000, "same-run runner should pick up the next command without multi-second polling latency");
     assert.equal(multiEvents.filter((event) => event.type === "backend_status" && event.payload?.phase === "codex-app-server-starting").length, 1);
     assert.equal(multiEvents.filter((event) => event.type === "backend_status" && event.payload?.phase === "codex-app-server:reused").length, 1);
     assert.equal(multiEvents.filter((event) => event.type === "backend_status" && event.payload?.phase === "resource-bundle-materialized").length, 1);
@@ -164,6 +169,11 @@ async function waitForCommandState(client: ManagerClient, runId: string, command
   throw new Error(`command ${commandId} did not reach ${state}`);
 }
 
+async function commandCreatedAt(client: ManagerClient, runId: string, commandId: string): Promise<string> {
+  const command = await client.get(`/api/v1/runs/${runId}/commands/${commandId}`) as { createdAt?: string };
+  return command.createdAt ?? "";
+}
+
 async function readTextIfExists(filePath: string): Promise<string> {
   try {
     return await readFile(filePath, "utf8");