feat: assemblePlanPrompt 改为按单文档组装，增加依赖说明

src/core/assembler.ts

@@ -15,35 +15,51 @@ export async function assemblePlanPrompt(
   config: RuneConfig,
   projectRoot: string,
   changeName: string,
+  documentName: string,
 ): Promise<string> {
   const plan = config.stages.plan;
   if (!plan) throw new Error("plan 阶段未配置");
 
+  const doc = plan.documents.find((d) => d.name === documentName);
+  if (!doc) {
+    throw new Error(`文档 "${documentName}" 不在配置的 plan.documents 中`);
+  }
+
   const changeDir = getChangeDir(projectRoot, changeName);
   const parts: string[] = [];
 
-  parts.push(`# 规划阶段：${changeName}\n`);
-  parts.push("请为当前变更生成以下文档：\n");
+  parts.push(`# 规划阶段：${changeName}`);
+  parts.push("");
+  parts.push(`## 文档：${doc.name}.md`);
+  parts.push(doc.prompt);
 
-  for (const doc of plan.documents) {
-    parts.push(`## 文档：${doc.name}.md`);
-    parts.push(doc.prompt);
-
-    const docPath = join(changeDir, `${doc.name}.md`);
-    if (existsSync(docPath)) {
-      const existing = await readFile(docPath, "utf-8");
-      parts.push(`\n### 已有内容（请在此基础上修订）：\n${existing}`);
-    }
-
-    if (doc.template) {
-      const rendered = doc.template.replace(/\{\{change-name\}\}/g, changeName);
-      parts.push(`\n### 格式模板：\n${rendered}`);
-    }
-
-    parts.push("");
+  const docPath = join(changeDir, `${doc.name}.md`);
+  if (existsSync(docPath)) {
+    const existing = await readFile(docPath, "utf-8");
+    parts.push(`\n### 已有内容（请在此基础上修订）：\n${existing}`);
   }
 
-  parts.push(`请将文档写入目录：${changeDir}`);
+  if (doc.template) {
+    const rendered = doc.template.replace(/\{\{change-name\}\}/g, changeName);
+    parts.push(`\n### 格式模板：\n${rendered}`);
+  }
+
+  if (doc.depend && doc.depend.length > 0) {
+    parts.push("\n---\n");
+    parts.push("## 依赖说明\n");
+    parts.push("本文档依赖以下前置文档：");
+
+    for (const dep of doc.depend) {
+      const depPath = join(changeDir, `${dep}.md`);
+      const depCompleted = existsSync(depPath);
+      const status = depCompleted ? "已完成" : "未完成";
+      parts.push(`- ${dep}.md（${status}）`);
+    }
+
+    parts.push("\n请先阅读已完成的前置文档，确保内容一致。");
+  }
+
+  parts.push(`\n请将文档写入目录：${changeDir}`);
   return parts.join("\n");
 }