refactor: discuss 和 plan 阶段改用 PromptBuilder 组装提示词

src/core/assembler.ts

@@ -6,6 +6,7 @@ import { CommandError } from "../cli/errors.ts";
 import { getChangeDir } from "./config.ts";
 import { parseTasks, validateTaskFormat, TaskFormatError } from "./task-parser.ts";
 import { applyCommandPrefix, getPmPrefix } from "./pm.ts";
+import { PromptBuilder } from "./prompt-builder";
 
 export function assembleDiscussPrompt(config: RuneConfig): string {
   const discuss = config.stages.discuss;
@@ -13,7 +14,10 @@ export function assembleDiscussPrompt(config: RuneConfig): string {
     throw new CommandError("讨论阶段未配置", {
       hint: "请在 .rune/config.yaml 中配置 stages.discuss",
     });
-  return applyCommandPrefix(discuss.prompt, config);
+
+  const raw = new PromptBuilder().head("# 讨论阶段").prompt(discuss.prompt).build();
+
+  return applyCommandPrefix(raw, config);
 }
 
 export async function assemblePlanPrompt(
@@ -36,39 +40,35 @@ export async function assemblePlanPrompt(
   }
 
   const changeDir = getChangeDir(projectRoot, changeName);
-  const parts: string[] = [];
+  const builder = new PromptBuilder();
 
-  parts.push(`# 规划阶段：${changeName}`);
-  parts.push("");
-  parts.push(`## 文档：${doc.name}.md`);
-  parts.push(doc.prompt);
+  builder.head(`# 规划阶段：${changeName}\n\n## 文档：${doc.name}.md`);
+  builder.prompt(doc.prompt);
 
   const docPath = join(changeDir, `${doc.name}.md`);
   if (existsSync(docPath)) {
-    parts.push(`\n文档已存在，请先读取 ${docPath} 查看已有内容，在此基础上修订。`);
+    builder.context(`文档已存在，请先读取 ${docPath} 查看已有内容，在此基础上修订。`);
   }
 
   if (doc.template) {
-    parts.push(`\n### 格式模板：\n${doc.template}`);
+    builder.context(`### 格式模板：\n${doc.template}`);
   }
 
   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 depLines = doc.depend.map((dep) => {
       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。");
+      return `- ${dep}.md（${status}）`;
+    });
+    builder.context(
+      `## 依赖说明\n\n本文档依赖以下前置文档：\n${depLines.join("\n")}\n\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：${changeDir}`);
-  return applyCommandPrefix(parts.join("\n"), config);
+  builder.guide(`请将文档写入目录：${changeDir}`);
+
+  return applyCommandPrefix(builder.build(), config);
 }
 
 export async function assembleTaskPrompt(

tests/core/assembler.test.ts

@@ -35,7 +35,8 @@ describe("assembleDiscussPrompt", () => {
       stages: { discuss: { prompt: "自定义讨论" } },
     };
     const prompt = assembleDiscussPrompt(config);
-    expect(prompt).toBe("自定义讨论");
+    expect(prompt).toContain("自定义讨论");
+    expect(prompt).toContain("# 讨论阶段");
   });
 });
 

tests/integration/flow.test.ts

@@ -118,7 +118,8 @@ describe("完整 SDD 流程", () => {
     const config = await loadConfig(TMP_DIR);
 
     const discussPrompt = assembleDiscussPrompt(config);
-    expect(discussPrompt).toBe("自定义讨论");
+    expect(discussPrompt).toContain("自定义讨论");
+    expect(discussPrompt).toContain("# 讨论阶段");
 
     await mkdir(getChangeDir(TMP_DIR, "test"), { recursive: true });
     const planPrompt = await assemblePlanPrompt(config, TMP_DIR, "test", "spec");