diff --git a/hub/src/feishu/trigger.ts b/hub/src/feishu/trigger.ts
index 28ff748..0793b00 100644
--- a/hub/src/feishu/trigger.ts
+++ b/hub/src/feishu/trigger.ts
@@ -156,7 +156,7 @@ export function makeTriggerHandler(deps: TriggerDeps) {
     // ADR-0002: if locked by another run, reply busy.
     const existing = await currentLockRunId(deps.prisma, projectId);
     if (existing !== null) {
-      await sendText(rt, chatId, "项目正在处理中,请稍候。");
+      await reactToMessage(rt, msg.message_id, "Hourglass");
       return;
     }
 
@@ -243,7 +243,7 @@ export function makeTriggerHandler(deps: TriggerDeps) {
         data: { status: "FAILED", error: "lock race", finishedAt: new Date() },
       });
       await writeAudit(deps.prisma, { runId: run.id, projectId, action: "run.lock_race", metadata: {} });
-      await sendText(rt, chatId, "项目正在处理中,请稍候。");
+      await reactToMessage(rt, msg.message_id, "Hourglass");
       return;
     }
 
@@ -257,17 +257,23 @@ export function makeTriggerHandler(deps: TriggerDeps) {
     // Emoji reaction on the user's message (acknowledge receipt).
     await reactToMessage(rt, msg.message_id, "THUMBSUP");
 
-    // Stream agent response as text-as-card messages — patchable, markdown,
-    // no truncation. Lower throttle (400ms) for smoother streaming.
-    let currentMsgId = await sendTextMessage(rt, chatId, "");
+    // Stream agent response as text-as-card messages. Lazy-init: don't send
+    // anything until the first text-delta arrives (avoids empty placeholder).
+    let currentMsgId: string | null = null;
     let accText = "";
     let lastPatch = 0;
     const PATCH_INTERVAL = 400;
     const MAX_MSG_LEN = 4000;
 
     const flushText = async () => {
+      if (currentMsgId === null) {
+        // First chunk — create the message immediately (no throttle on init).
+        currentMsgId = await sendTextMessage(rt, chatId, accText);
+        lastPatch = Date.now();
+        return;
+      }
       const now = Date.now();
-      if (now - lastPatch < PATCH_INTERVAL || currentMsgId === null) return;
+      if (now - lastPatch < PATCH_INTERVAL) return;
       lastPatch = now;
       if (accText.length > MAX_MSG_LEN) {
         await patchTextMessage(rt, currentMsgId, accText.slice(0, MAX_MSG_LEN));
@@ -294,9 +300,14 @@ export function makeTriggerHandler(deps: TriggerDeps) {
       },
     })
       .then(async (result) => {
-        // Final flush: make sure the last message has complete text.
+        // Final flush: patch the last message with complete text, or send
+        // the full response if no streaming message was created yet.
         if (currentMsgId !== null && accText.length > 0) {
           await patchTextMessage(rt, currentMsgId, accText);
+        } else if (currentMsgId === null && result.text.length > 0) {
+          // No text-delta was received (e.g. model returned all at once).
+          // Send the full text now.
+          await sendTextMessage(rt, chatId, result.text);
         }
         await deps.prisma.agentRun.update({
           where: { id: run.id },
diff --git a/hub/src/server.ts b/hub/src/server.ts
index 798f675..d78c60c 100644
--- a/hub/src/server.ts
+++ b/hub/src/server.ts
@@ -42,6 +42,16 @@ async function main(): Promise<void> {
 
   const app = Fastify({ logger: true });
 
+  // Startup reset: clear stale locks + mark dead runs as FAILED.
+  await prisma.projectAgentLock.deleteMany({});
+  await prisma.agentRun.updateMany({
+    where: { status: "ACTIVE" },
+    data: { status: "FAILED", error: "process restart", finishedAt: new Date() },
+  });
+  app.log.info("startup: cleared stale locks + dead runs");
+
+
+
   app.get("/api/healthz", async () => ({ ok: true, ts: Date.now() }));
 
   // Model registry (role-as-data, ADR-0017). Claude Code SDK uses model