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/builtin-tools/src/tools/CtxInspectTool/CtxInspectTool.ts

@@ -0,0 +1,80 @@
+import { z } from 'zod/v4'
+import type { ToolResultBlockParam } from 'src/Tool.js'
+import { buildTool } from 'src/Tool.js'
+import { lazySchema } from 'src/utils/lazySchema.js'
+
+const CTX_INSPECT_TOOL_NAME = 'CtxInspect'
+
+const inputSchema = lazySchema(() =>
+  z.strictObject({
+    query: z
+      .string()
+      .optional()
+      .describe('Optional query to filter context entries. If omitted, returns a summary of all context.'),
+  }),
+)
+type InputSchema = ReturnType<typeof inputSchema>
+type CtxInput = z.infer<InputSchema>
+
+type CtxOutput = {
+  total_tokens: number
+  message_count: number
+  summary: string
+}
+
+export const CtxInspectTool = buildTool({
+  name: CTX_INSPECT_TOOL_NAME,
+  searchHint: 'context inspect tokens usage messages window collapse',
+  maxResultSizeChars: 50_000,
+  strict: true,
+
+  get inputSchema(): InputSchema {
+    return inputSchema()
+  },
+
+  async description() {
+    return 'Inspect the current context window contents and token usage'
+  },
+  async prompt() {
+    return `Inspect the current conversation context. Shows token usage, message count, and a breakdown of what's consuming context space.
+
+Use this to understand your context budget before deciding whether to snip old messages or adjust your approach.`
+  },
+
+  isConcurrencySafe() {
+    return true
+  },
+  isReadOnly() {
+    return true
+  },
+
+  userFacingName() {
+    return 'CtxInspect'
+  },
+
+  renderToolUseMessage() {
+    return 'Context Inspect'
+  },
+
+  mapToolResultToToolResultBlockParam(
+    content: CtxOutput,
+    toolUseID: string,
+  ): ToolResultBlockParam {
+    return {
+      tool_use_id: toolUseID,
+      type: 'tool_result',
+      content: `Context: ${content.total_tokens} tokens, ${content.message_count} messages\n${content.summary}`,
+    }
+  },
+
+  async call() {
+    // Context inspection is wired into the context collapse system.
+    return {
+      data: {
+        total_tokens: 0,
+        message_count: 0,
+        summary: 'Context inspection requires the CONTEXT_COLLAPSE runtime.',
+      },
+    }
+  },
+})