feat: 添加对 langfuse 监控的支持 (#242)

* docs: 更新类型检查的 CLAUDE.md

* feat: 添加模型 1M 上下文切换

* chore: remove prefetchOfficialMcpUrls call on startup

* docs: 添加 git commit 规范

* feat: 第一次接入 langfuse

* fix: 修复 generation 的计时的错误

* feat: 添加多 agent 的监控

* feat: 添加 /poor 省流模式，toggle 关闭 extract_memories 和 prompt_suggestion

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

* chore: 修复 lock 文件

* chore: 更新类型依赖

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/Tool.ts

@@ -76,6 +76,7 @@ import type { SpinnerMode } from './components/Spinner.js'
 import type { QuerySource } from './constants/querySource.js'
 import type { SDKStatus } from './entrypoints/agentSdkTypes.js'
 import type { AppState } from './state/AppState.js'
+import type { LangfuseSpan } from './services/langfuse/index.js'
 import type {
   HookProgress,
   PromptRequest,
@@ -273,6 +274,8 @@ export type ToolUseContext = {
   ) => (request: PromptRequest) => Promise<PromptResponse>
   toolUseId?: string
   criticalSystemReminder_EXPERIMENTAL?: string
+  /** Langfuse root trace span for this query turn. Passed down to tool execution for observability. */
+  langfuseTrace?: LangfuseSpan | null
   /** When true, preserve toolUseResult on messages even for subagents.
    * Used by in-process teammates whose transcripts are viewable by the user. */
   preserveToolUseResults?: boolean