feat: add standard agent chat mode

Author: MarkShawn2020

scripts/agent-chat-harness.mjs

@@ -0,0 +1,75 @@
+#!/usr/bin/env node
+
+const args = process.argv.slice(2);
+
+if (args.includes("--version") || args.includes("-V")) {
+  console.log("lovcode-agent-chat-harness 1.0.0");
+  process.exit(0);
+}
+
+const readFlag = (name, fallback = null) => {
+  const index = args.indexOf(name);
+  if (index === -1 || index + 1 >= args.length) return fallback;
+  return args[index + 1];
+};
+
+const provider = readFlag("--provider", "claude");
+const sessionId = readFlag("--session-id", "dev-session");
+const resumeId = readFlag("--resume");
+const prompt = args[args.length - 1] && !args[args.length - 1].startsWith("--")
+  ? args[args.length - 1]
+  : "hello";
+
+const wait = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
+const writeJson = (value) => process.stdout.write(`${JSON.stringify(value)}\n`);
+const writeErrJson = (value) => process.stderr.write(`${JSON.stringify(value)}\n`);
+
+async function runClaude() {
+  writeJson({ type: "system", subtype: "init", session_id: sessionId, resume_id: resumeId });
+  await wait(120);
+  writeJson({
+    type: "assistant",
+    message: {
+      role: "assistant",
+      content: [{ type: "text", text: "收到，" }],
+    },
+  });
+  await wait(120);
+  writeJson({
+    type: "assistant",
+    message: {
+      role: "assistant",
+      content: [{ type: "text", text: `我会处理：${prompt}` }],
+    },
+  });
+  await wait(120);
+  writeJson({ type: "result", result: "已完成模拟执行。" });
+}
+
+async function runCodex() {
+  writeJson({ type: "session.started", id: sessionId, resume_id: resumeId });
+  for (const text of ["收到，", "我会处理：", prompt, "\n\n已完成模拟执行。"]) {
+    await wait(100);
+    writeJson({ type: "agent_message_delta", delta: text });
+  }
+}
+
+if (prompt.includes("harness-error")) {
+  writeErrJson({ type: "error", message: "Simulated harness error" });
+  process.exit(2);
+}
+
+if (prompt.includes("harness-stderr")) {
+  process.stderr.write("Simulated stderr line\n");
+}
+
+try {
+  if (provider === "codex") {
+    await runCodex();
+  } else {
+    await runClaude();
+  }
+} catch (error) {
+  writeErrJson({ type: "error", message: error instanceof Error ? error.message : String(error) });
+  process.exit(1);
+}