feat: CLI help 格式化输出

tests/cli/help.test.ts

@@ -0,0 +1,50 @@
+import { describe, it, expect } from "bun:test";
+import { showGlobalHelp, showCommandHelp } from "../../src/cli/help.ts";
+
+describe("showGlobalHelp", () => {
+  it("包含所有命令行", () => {
+    const output = showGlobalHelp();
+    expect(output).toContain("rune <命令> [参数]");
+    expect(output).toContain("init <工具...>");
+    expect(output).toContain("discuss");
+    expect(output).toContain("plan <名称>");
+    expect(output).toContain("build <名称>");
+    expect(output).toContain("archive <名称>");
+    expect(output).toContain("status");
+    expect(output).toContain("help");
+    expect(output).toContain("version");
+  });
+
+  it("包含示例", () => {
+    const output = showGlobalHelp();
+    expect(output).toContain("rune init opencode");
+    expect(output).toContain("rune plan add-login");
+    expect(output).toContain("rune status");
+  });
+
+  it("以标题行开头", () => {
+    const output = showGlobalHelp();
+    expect(output.startsWith("Rune")).toBe(true);
+  });
+});
+
+describe("showCommandHelp", () => {
+  it("plan 命令包含用法、参数、描述、示例", () => {
+    const output = showCommandHelp("plan");
+    expect(output).toContain("rune plan <change-name>");
+    expect(output).toContain("<change-name>");
+    expect(output).toContain("规划阶段");
+    expect(output).toContain("rune plan add-user-auth");
+  });
+
+  it("init 命令包含工具参数说明", () => {
+    const output = showCommandHelp("init");
+    expect(output).toContain("rune init <工具...>");
+    expect(output).toContain("opencode");
+  });
+
+  it("不存在的命令返回 null", () => {
+    const output = showCommandHelp("nonexistent");
+    expect(output).toBeNull();
+  });
+});