feat: 工具层及 mcp 大重构 (#252)

* feat: 第一版大重构

* fix: 修复类型问题

* chore: 更新版本到 1.3.2

* Add brave as alternative WebSearchTool

* fix: 修正顺序

* fix: 修复对穷鬼模式的 auto dream 和 session memory 越过

* feat: 穷鬼模式去除 session-summary

* feat: 创建 builtin-tools 包，搬运所有工具实现

将 src/tools/ 下的全部 60 个工具目录迁移至 packages/builtin-tools/src/tools/，
内部导入路径已更新为 src/ alias 模式。

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

* refactor: 更新 src/ 中所有工具引用至 builtin-tools 包，删除 src/tools/

- src/tools.ts 及 178 个 src/ 文件的 import 路径从 ./tools/ 改为 builtin-tools/tools/
- 删除 src/tools/ 整个目录（已迁移至 packages/builtin-tools/）

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

* chore: 添加 builtin-tools 路径别名至 tsconfig，更新 bun.lock

- tsconfig.json 新增 builtin-tools/* 和 builtin-tools 路径映射
- 新增 packages/builtin-tools/src 至 include

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

* refactor: 为 builtin-tools、mcp-client、agent-tools 添加 @claude-code-best 作用域前缀

所有包名及 import 路径统一添加 @claude-code-best/ 前缀：
- builtin-tools → @claude-code-best/builtin-tools
- mcp-client → @claude-code-best/mcp-client
- agent-tools → @claude-code-best/agent-tools

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

* fix: 修复 node 环境没有 bun 的问题

---------

Co-authored-by: Eric-Guo <eric.guocz@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/mcp-client/src/cache.ts

@@ -0,0 +1,58 @@
+// LRU memoization cache for MCP tool discovery
+// Adapted from src/utils/memoize.ts — only memoizeWithLRU needed
+
+import { LRUCache } from 'lru-cache'
+
+type LRUMemoizedFunction<Args extends unknown[], Result> = {
+  (...args: Args): Result
+  cache: {
+    clear: () => void
+    size: () => number
+    delete: (key: string) => boolean
+    get: (key: string) => Result | undefined
+    has: (key: string) => boolean
+  }
+}
+
+/**
+ * Creates a memoized function with LRU eviction policy.
+ * Prevents unbounded memory growth by evicting least recently used entries.
+ *
+ * @param f The function to memoize
+ * @param cacheFn Key generation function
+ * @param maxCacheSize Maximum cache entries (default 100)
+ */
+export function memoizeWithLRU<
+  Args extends unknown[],
+  Result extends NonNullable<unknown>,
+>(
+  f: (...args: Args) => Result,
+  cacheFn: (...args: Args) => string,
+  maxCacheSize: number = 100,
+): LRUMemoizedFunction<Args, Result> {
+  const cache = new LRUCache<string, Result>({
+    max: maxCacheSize,
+  })
+
+  const memoized = (...args: Args): Result => {
+    const key = cacheFn(...args)
+    const cached = cache.get(key)
+    if (cached !== undefined) {
+      return cached
+    }
+
+    const result = f(...args)
+    cache.set(key, result)
+    return result
+  }
+
+  memoized.cache = {
+    clear: () => cache.clear(),
+    size: () => cache.size,
+    delete: (key: string) => cache.delete(key),
+    get: (key: string) => cache.peek(key),
+    has: (key: string) => cache.has(key),
+  }
+
+  return memoized
+}