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/transport/InProcessTransport.ts

@@ -0,0 +1,63 @@
+import type { Transport } from '@modelcontextprotocol/sdk/shared/transport.js'
+import type { JSONRPCMessage } from '@modelcontextprotocol/sdk/types.js'
+
+/**
+ * In-process linked transport pair for running an MCP server and client
+ * in the same process without spawning a subprocess.
+ *
+ * `send()` on one side delivers to `onmessage` on the other.
+ * `close()` on either side calls `onclose` on both.
+ */
+class InProcessTransport implements Transport {
+  private peer: InProcessTransport | undefined
+  private closed = false
+
+  onclose?: () => void
+  onerror?: (error: Error) => void
+  onmessage?: (message: JSONRPCMessage) => void
+
+  /** @internal */
+  _setPeer(peer: InProcessTransport): void {
+    this.peer = peer
+  }
+
+  async start(): Promise<void> {}
+
+  async send(message: JSONRPCMessage): Promise<void> {
+    if (this.closed) {
+      throw new Error('Transport is closed')
+    }
+    // Deliver to the other side asynchronously to avoid stack depth issues
+    // with synchronous request/response cycles
+    queueMicrotask(() => {
+      this.peer?.onmessage?.(message)
+    })
+  }
+
+  async close(): Promise<void> {
+    if (this.closed) {
+      return
+    }
+    this.closed = true
+    this.onclose?.()
+    // Close the peer if it hasn't already closed
+    if (this.peer && !this.peer.closed) {
+      this.peer.closed = true
+      this.peer.onclose?.()
+    }
+  }
+}
+
+/**
+ * Creates a pair of linked transports for in-process MCP communication.
+ * Messages sent on one transport are delivered to the other's `onmessage`.
+ *
+ * @returns [clientTransport, serverTransport]
+ */
+export function createLinkedTransportPair(): [Transport, Transport] {
+  const a = new InProcessTransport()
+  const b = new InProcessTransport()
+  a._setPeer(b)
+  b._setPeer(a)
+  return [a, b]
+}