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>

src/utils/__tests__/envValidation.test.ts

@@ -1,20 +1,8 @@
 import { mock, describe, expect, test } from "bun:test";
+import { debugMock } from "../../../tests/mocks/debug";
 
 // Mock debug.ts to cut bootstrap/state dependency chain
-mock.module("src/utils/debug.ts", () => ({
-  logForDebugging: () => {},
-  isDebugMode: () => false,
-  isDebugToStdErr: () => false,
-  getDebugFilePath: () => null,
-  getDebugFilter: () => null,
-  getMinDebugLogLevel: () => "debug",
-  getDebugLogPath: () => "/tmp/mock-debug.log",
-  flushDebugLogs: async () => {},
-  enableDebugLogging: () => false,
-  setHasFormattedOutput: () => {},
-  getHasFormattedOutput: () => false,
-  logAntError: () => {},
-}));
+mock.module("src/utils/debug.ts", debugMock);
 
 const { validateBoundedIntEnvVar } = await import("../envValidation");
 

src/utils/__tests__/json.test.ts

@@ -1,12 +1,8 @@
 import { mock, describe, expect, test } from "bun:test";
+import { logMock } from "../../../tests/mocks/log";
 
 // Mock log.ts to cut the heavy dependency chain (log.ts → bootstrap/state.ts → analytics)
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 const { safeParseJSON, safeParseJSONC, parseJSONL, addItemToJSONCArray } =
   await import("../json");

src/utils/__tests__/memoize.test.ts

@@ -1,12 +1,8 @@
 import { mock, describe, expect, test, beforeEach } from "bun:test";
+import { logMock } from "../../../tests/mocks/log";
 
 // Mock log.ts to cut the bootstrap/state dependency chain
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 const { memoizeWithTTL, memoizeWithTTLAsync, memoizeWithLRU } = await import(
   "../memoize"

src/utils/__tests__/tokens.test.ts

@@ -1,22 +1,8 @@
 import { mock, describe, expect, test } from "bun:test";
+import { logMock } from "../../../tests/mocks/log";
 
 // Mock heavy dependency chain: tokenEstimation.ts → log.ts → bootstrap/state.ts
-mock.module("src/utils/log.ts", () => ({
-  logError: () => {},
-  logToFile: () => {},
-  getLogDisplayTitle: () => "",
-  logEvent: () => {},
-  logMCPError: () => {},
-  logMCPDebug: () => {},
-  dateToFilename: (d: Date) => d.toISOString().replace(/[:.]/g, "-"),
-  getLogFilePath: () => "/tmp/mock-log",
-  attachErrorLogSink: () => {},
-  getInMemoryErrors: () => [],
-  loadErrorLogs: async () => [],
-  getErrorLogByIndex: async () => null,
-  captureAPIRequest: () => {},
-  _resetErrorLogForTesting: () => {},
-}));
+mock.module("src/utils/log.ts", logMock);
 
 // Mock tokenEstimation to avoid pulling in API provider deps
 mock.module("src/services/tokenEstimation.ts", () => ({