Add gui/cli capability conflict guards

local-agent/server.mjs

@@ -70,6 +70,11 @@ async function resolveHeartbeatProjects(config, runtime) {
 }
 
 async function postHeartbeat(config, runtime, heartbeatProjects) {
+  const now = new Date().toISOString();
+  const preferredExecutionMode =
+    config.preferredExecutionMode === "gui" || config.preferredExecutionMode === "cli"
+      ? config.preferredExecutionMode
+      : undefined;
   const response = await fetch(`${config.controlPlaneUrl.replace(/\/$/, "")}/api/device-heartbeat`, {
     method: "POST",
     headers: { "Content-Type": "application/json" },
@@ -83,6 +88,19 @@ async function postHeartbeat(config, runtime, heartbeatProjects) {
       status: config.status,
       quota5h: config.quota5h,
       quota7d: config.quota7d,
+      capabilities: {
+        gui: {
+          connected: Boolean(config.guiConnected),
+          lastSeenAt: now,
+          lastActiveProjectId: "",
+        },
+        cli: {
+          connected: true,
+          lastSeenAt: now,
+          lastActiveProjectId: "",
+        },
+      },
+      preferredExecutionMode,
       projects: heartbeatProjects.projects,
       projectCandidates: heartbeatProjects.projectCandidates,
       endpoint: config.endpoint,