refactor: 修复代码审查发现的问题

- Bug修复: formatChangeStatus 使用实际配置而非 defaultConfig
- 统一 assembler 中所有错误抛出为 CommandError
- 提取 writeIfChanged 到 adapters/utils.ts，消除 claude-code/opencode 重复代码
- 导出 SUPPORTED_TOOLS，cli.ts update 命令复用同一工具注册表
- 提取 mapError/mapCacError 函数，支持单元测试
- 补充 claude-code 适配器测试（10 个用例）
- 补充 validateChangeName、formatChangeStatus、suggestNextStep、mapError 单元测试（18 个用例）
- 共新增 3 个测试文件，测试从 96 增至 133，全部通过

tests/cli/status.test.ts

@@ -0,0 +1,156 @@
+import { describe, it, expect } from "bun:test";
+import { formatChangeStatus, suggestNextStep } from "../../src/cli.ts";
+import type { ChangeStatus, RuneConfig } from "../../src/types.ts";
+
+function makeStatus(overrides: Partial<ChangeStatus> = {}): ChangeStatus {
+  return {
+    name: "test-change",
+    documents: [],
+    planCompleted: false,
+    buildUnlocked: false,
+    taskProgress: null,
+    ...overrides,
+  };
+}
+
+describe("formatChangeStatus", () => {
+  it("显示变更名", () => {
+    const output = formatChangeStatus(makeStatus());
+    expect(output).toContain("test-change");
+  });
+
+  it("显示已完成和待完成文档", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "design", completed: true, dependMet: true },
+        { name: "task", completed: false, dependMet: true },
+      ],
+    });
+    const output = formatChangeStatus(status);
+    expect(output).toContain("design.md    ✓ 已完成");
+    expect(output).toContain("task.md    ○ 待完成");
+  });
+
+  it("显示文档依赖信息（dependMet 为 false 且 config 中有依赖）", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "task", completed: false, dependMet: false },
+      ],
+    });
+    const config: RuneConfig = {
+      stages: {
+        plan: {
+          documents: [
+            { name: "design", prompt: "生成设计" },
+            { name: "task", prompt: "生成任务", depend: ["design"] },
+          ],
+        },
+      },
+    };
+    const output = formatChangeStatus(status, config);
+    expect(output).toContain("依赖 design.md");
+  });
+
+  it("dependMet 为 false 但无 config 时不显示文档依赖信息", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "task", completed: false, dependMet: false },
+      ],
+    });
+    const output = formatChangeStatus(status);
+    expect(output).not.toContain("（依赖");
+  });
+
+  it("显示规划进度", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "design", completed: true, dependMet: true },
+        { name: "task", completed: false, dependMet: true },
+      ],
+    });
+    const output = formatChangeStatus(status);
+    expect(output).toContain("1/2 文档已完成");
+  });
+
+  it("规划完成时显示构建已解锁", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "design", completed: true, dependMet: true },
+        { name: "task", completed: true, dependMet: true },
+      ],
+      planCompleted: true,
+      buildUnlocked: true,
+    });
+    const output = formatChangeStatus(status);
+    expect(output).toContain("已解锁");
+  });
+
+  it("显示任务进度", () => {
+    const status = makeStatus({
+      taskProgress: { completed: 3, total: 5 },
+    });
+    const output = formatChangeStatus(status);
+    expect(output).toContain("3/5 已完成");
+  });
+
+  it("包含下一步建议", () => {
+    const output = formatChangeStatus(makeStatus());
+    expect(output).toContain("建议下一步");
+  });
+});
+
+describe("suggestNextStep", () => {
+  it("规划未完成时返回下一个可规划文档", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "design", completed: false, dependMet: true },
+      ],
+    });
+    expect(suggestNextStep(status)).toContain("rune plan test-change design");
+  });
+
+  it("规划未完成且依赖未满足时提示完成前置依赖", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "design", completed: false, dependMet: false },
+      ],
+    });
+    expect(suggestNextStep(status)).toBe("完成前置依赖后再规划文档");
+  });
+
+  it("规划完成且有未完成任务时建议 build", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "design", completed: true, dependMet: true },
+        { name: "task", completed: true, dependMet: true },
+      ],
+      planCompleted: true,
+      taskProgress: { completed: 2, total: 5 },
+    });
+    expect(suggestNextStep(status)).toContain("rune build test-change");
+  });
+
+  it("任务全部完成时建议 archive", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "design", completed: true, dependMet: true },
+        { name: "task", completed: true, dependMet: true },
+      ],
+      planCompleted: true,
+      taskProgress: { completed: 5, total: 5 },
+    });
+    expect(suggestNextStep(status)).toContain("rune archive test-change");
+  });
+
+  it("规划完成但无 taskProgress 时建议 build", () => {
+    const status = makeStatus({
+      documents: [
+        { name: "design", completed: true, dependMet: true },
+        { name: "task", completed: true, dependMet: true },
+      ],
+      planCompleted: true,
+      taskProgress: null,
+    });
+    expect(suggestNextStep(status)).toContain("rune build test-change");
+  });
+});