refactor: 统一 log.ts/debug.ts 的测试 mock 为共享定义

- 新增 tests/mocks/log.ts 和 tests/mocks/debug.ts，覆盖源文件全部实际导出
- 移除旧 mock 中不存在的导出（logToFile、logEvent、getLogFilePath）
- 13 个测试文件改为使用共享 mock，避免定义分散和不一致

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/mocks/debug.ts

@@ -0,0 +1,25 @@
+/**
+ * Shared mock for src/utils/debug.ts
+ *
+ * Cuts the bootstrap/state.ts dependency chain (module-level realpathSync + randomUUID).
+ * Must be called via mock.module("src/utils/debug.ts", debugMock) BEFORE any import that
+ * transitively depends on debug.ts.
+ *
+ * Exported as a factory so each call produces a fresh object (mock.module requirement).
+ */
+export function debugMock() {
+  return {
+    getMinDebugLogLevel: () => "debug" as const,
+    isDebugMode: () => false,
+    enableDebugLogging: () => false,
+    getDebugFilter: () => null,
+    isDebugToStdErr: () => false,
+    getDebugFilePath: () => null as string | null,
+    setHasFormattedOutput: () => {},
+    getHasFormattedOutput: () => false,
+    flushDebugLogs: async () => {},
+    logForDebugging: () => {},
+    getDebugLogPath: () => "/tmp/mock-debug.log",
+    logAntError: () => {},
+  }
+}