test: 添加 Utils 纯函数单元测试 (测试计划 02)

覆盖 xml, hash, stringUtils, semver, uuid, format, frontmatterParser,
file, glob, diff 共 10 个模块的纯函数测试。
json.ts 因模块加载链路过重暂跳过。
共 190 个测试用例（含已有 array/set）全部通过。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/utils/__tests__/glob.test.ts

@@ -0,0 +1,40 @@
+import { describe, expect, test } from "bun:test";
+import { extractGlobBaseDirectory } from "../glob";
+
+describe("extractGlobBaseDirectory", () => {
+  test("extracts base dir from glob with *", () => {
+    const result = extractGlobBaseDirectory("src/utils/*.ts");
+    expect(result.baseDir).toBe("src/utils");
+    expect(result.relativePattern).toBe("*.ts");
+  });
+
+  test("extracts base dir from glob with **", () => {
+    const result = extractGlobBaseDirectory("src/**/*.ts");
+    expect(result.baseDir).toBe("src");
+    expect(result.relativePattern).toBe("**/*.ts");
+  });
+
+  test("returns dirname for literal path", () => {
+    const result = extractGlobBaseDirectory("src/utils/file.ts");
+    expect(result.baseDir).toBe("src/utils");
+    expect(result.relativePattern).toBe("file.ts");
+  });
+
+  test("handles glob starting with pattern", () => {
+    const result = extractGlobBaseDirectory("*.ts");
+    expect(result.baseDir).toBe("");
+    expect(result.relativePattern).toBe("*.ts");
+  });
+
+  test("handles braces pattern", () => {
+    const result = extractGlobBaseDirectory("src/{a,b}/*.ts");
+    expect(result.baseDir).toBe("src");
+    expect(result.relativePattern).toBe("{a,b}/*.ts");
+  });
+
+  test("handles question mark pattern", () => {
+    const result = extractGlobBaseDirectory("src/?.ts");
+    expect(result.baseDir).toBe("src");
+    expect(result.relativePattern).toBe("?.ts");
+  });
+});