feat: archive 阶段校验 task 完成状态，未完成时注入警告提示词

src/core/assembler.ts

@@ -111,15 +111,39 @@ export async function assembleBuildPrompt(
   return parts.join("\n");
 }
 
-export function assembleArchivePrompt(
+export async function assembleArchivePrompt(
   config: RuneConfig,
+  projectRoot: string,
   changeName: string,
-): string {
+): Promise<string> {
   const archive = config.stages.archive;
   if (!archive) throw new Error("archive 阶段未配置");
 
+  const changeDir = getChangeDir(projectRoot, changeName);
+  const taskPath = join(changeDir, "task.md");
+
   const parts: string[] = [];
   parts.push(`# 归档阶段：${changeName}\n`);
+
+  try {
+    const taskContent = await readFile(taskPath, "utf-8");
+    const tasks = parseTasks(taskContent);
+    const incompleteTasks = tasks.filter((t) => !t.checked);
+    if (incompleteTasks.length > 0) {
+      parts.push("## ⚠️ 警告：存在未完成的任务\n");
+      parts.push(`以下 ${incompleteTasks.length} 个任务尚未完成：`);
+      for (const t of incompleteTasks) {
+        parts.push(`- [ ] ${t.text}`);
+      }
+      parts.push("");
+      parts.push("请询问用户是否确认在任务未全部完成的情况下归档。");
+      parts.push("如用户确认，则继续归档；否则中止并返回构建阶段。");
+      parts.push("");
+    }
+  } catch {
+    // task.md 不存在时不追加警告
+  }
+
   parts.push(archive.prompt);
   return parts.join("\n");
 }