fix: run agent manager as health service

cmd/hwlab-agent-mgr/main.mjs

@@ -1,4 +1,6 @@
 #!/usr/bin/env node
+import { createServer } from "node:http";
+
 import {
   AGENT_MGR_SERVICE_ID,
   createSkillsManifest
@@ -14,7 +16,7 @@ import {
   resolveAgentRuntimeStateDir
 } from "../../internal/agent/runtime.mjs";
 
-const command = process.argv[2] || "help";
+const command = process.argv[2] || process.env.HWLAB_AGENT_MGR_DEFAULT_COMMAND || "server";
 const options = parseOptions(process.argv.slice(3));
 
 try {
@@ -40,23 +42,11 @@ async function dispatch(name, opts) {
   }
 
   if (name === "health") {
-    const managerSkills = assessSkillsInjection({
-      skillCommitId: opts.skillCommitId,
-      skillVersion: opts.skillVersion,
-      role: "manager"
-    });
-    const health = createRuntimeHealth({
-      stateDir: opts.stateDir,
-      managerSkills
-    });
-    return {
-      serviceId: AGENT_MGR_SERVICE_ID,
-      ok: true,
-      health,
-      skillsManifest: managerSkills.status === "ready"
-        ? createSkillsManifest({ commitId: managerSkills.commitId, version: managerSkills.version })
-        : null
-    };
+    return createHealthResponse(opts);
+  }
+
+  if (name === "server") {
+    return serveHealth(opts);
   }
 
   if (name === "create") {
@@ -152,11 +142,84 @@ function requireOption(opts, key, flag) {
   return opts[key];
 }
 
+function createHealthResponse(opts) {
+  const managerSkills = assessSkillsInjection({
+    skillCommitId: opts.skillCommitId,
+    skillVersion: opts.skillVersion,
+    role: "manager"
+  });
+  const health = createRuntimeHealth({
+    stateDir: opts.stateDir,
+    managerSkills
+  });
+  return {
+    serviceId: AGENT_MGR_SERVICE_ID,
+    ok: true,
+    health,
+    skillsManifest: managerSkills.status === "ready"
+      ? createSkillsManifest({ commitId: managerSkills.commitId, version: managerSkills.version })
+      : null
+  };
+}
+
+async function serveHealth(opts) {
+  const port = Number.parseInt(process.env.PORT || process.env.HWLAB_PORT || "7410", 10);
+  if (!Number.isInteger(port) || port < 1 || port > 65535) {
+    throw new Error(`invalid PORT/HWLAB_PORT ${JSON.stringify(process.env.PORT || process.env.HWLAB_PORT)}`);
+  }
+
+  const server = createServer((request, response) => {
+    const url = new URL(request.url || "/", "http://hwlab-agent-mgr.local");
+    if (url.pathname === "/health" || url.pathname === "/health/live") {
+      sendJson(response, 200, {
+        ...createHealthResponse(opts),
+        environment: process.env.HWLAB_ENVIRONMENT || "dev",
+        commit: {
+          id: process.env.HWLAB_COMMIT_ID || "unknown",
+          source: "runtime-env"
+        },
+        image: {
+          reference: process.env.HWLAB_IMAGE || "unknown",
+          tag: process.env.HWLAB_IMAGE_TAG || "unknown",
+          digest: process.env.HWLAB_IMAGE_DIGEST || "unknown"
+        }
+      });
+      return;
+    }
+    if (url.pathname === "/" || url.pathname === "/help") {
+      sendJson(response, 200, help());
+      return;
+    }
+    sendJson(response, 404, { serviceId: AGENT_MGR_SERVICE_ID, ok: false, error: "not_found", path: url.pathname });
+  });
+
+  await new Promise((resolve, reject) => {
+    server.once("error", reject);
+    server.listen(port, "0.0.0.0", resolve);
+  });
+  printJSON({ serviceId: AGENT_MGR_SERVICE_ID, ok: true, status: "listening", port });
+
+  return new Promise((resolve, reject) => {
+    server.once("close", resolve);
+    server.once("error", reject);
+  });
+}
+
+function sendJson(response, statusCode, body) {
+  const payload = JSON.stringify(body, null, 2);
+  response.writeHead(statusCode, {
+    "content-type": "application/json; charset=utf-8",
+    "content-length": Buffer.byteLength(payload)
+  });
+  response.end(payload);
+}
+
 function help() {
   return {
     serviceId: AGENT_MGR_SERVICE_ID,
     ok: true,
     usage: [
+      "node cmd/hwlab-agent-mgr/main.mjs server [--skill-commit-id COMMIT --skill-version VERSION] [--state-dir DIR]",
       "node cmd/hwlab-agent-mgr/main.mjs health [--skill-commit-id COMMIT --skill-version VERSION] [--state-dir DIR]",
       "node cmd/hwlab-agent-mgr/main.mjs create --agent-session-id ID --project-id ID [--goal TEXT --prompt TEXT] [--skill-commit-id COMMIT --skill-version VERSION] [--state-dir DIR]",
       "node cmd/hwlab-agent-mgr/main.mjs status --agent-session-id ID [--state-dir DIR]",