fix: 修复 anthropic 煞笔的四个 bug (#352)

* fix: 移除文件编辑前必须先读取的限制

移除 FileEditTool 和 FileWriteTool 中的 "read before edit" 校验，
允许直接编辑未读取过的文件。保留文件修改过期检测。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* docs: 更新 teach-me 自动写 note 笔记的功能

* fix: 修复 DeepSeek V4 reasoning_content 回传导致的 400 错误

- 扩大模型名称检测范围，匹配所有 deepseek 模型（V4、R1 等）
- 始终保留 thinking blocks 为 reasoning_content 回传给 API
- 移除有 bug 的 turn boundary 剥离逻辑

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix: Opus 4.6/4.7 默认推理 effort 从 medium 改为 high

Pro 和 Max/Team 订阅者的 Opus 默认 effort 之前被降级为 medium，
导致用户感知模型「变笨」。恢复为 high。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix: 移除 thinkingClearLatched sticky-on 机制

空闲超过 1 小时后 thinkingClearLatched 会被触发且永不重置，
导致每轮 API 调用都清除 thinking 历史。完整移除该 latch 机制，
clearAllThinking 硬编码为 false。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix: 移除 numeric_length_anchors 系统指令

删除「工具调用间文字 ≤25 词、最终回复 ≤100 词」的硬性限制。
ablation 测试显示该约束使整体智能下降 3%。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix: 修复测试中 reasoning_content 类型断言

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/@ant/model-provider/src/shared/openaiConvertMessages.ts

@@ -26,16 +26,16 @@ export interface ConvertMessagesOptions {
  * - system prompt → role: "system" message prepended
  * - tool_use blocks → tool_calls[] on assistant message
  * - tool_result blocks → role: "tool" messages
- * - thinking blocks → silently dropped (or preserved as reasoning_content when enableThinking=true)
+ * - thinking blocks → preserved as reasoning_content (DeepSeek requires passing it back)
  * - cache_control → stripped
  */
 export function anthropicMessagesToOpenAI(
   messages: (UserMessage | AssistantMessage)[],
   systemPrompt: SystemPrompt,
-  options?: ConvertMessagesOptions,
+  // options retained for API compatibility; thinking blocks are now always preserved
+  _options?: ConvertMessagesOptions,
 ): ChatCompletionMessageParam[] {
   const result: ChatCompletionMessageParam[] = []
-  const enableThinking = options?.enableThinking ?? false
 
   // Prepend system prompt as system message
   const systemText = systemPromptToText(systemPrompt)
@@ -46,53 +46,13 @@ export function anthropicMessagesToOpenAI(
     } satisfies ChatCompletionSystemMessageParam)
   }
 
-  // When thinking mode is on, detect turn boundaries so that reasoning_content
-  // from *previous* user turns is stripped (saves bandwidth; DeepSeek ignores it).
-  // A "new turn" starts when a user text message appears after at least one assistant response.
-  const turnBoundaries = new Set<number>()
-  if (enableThinking) {
-    let hasSeenAssistant = false
-    for (let i = 0; i < messages.length; i++) {
-      const msg = messages[i]
-      if (msg.type === 'assistant') {
-        hasSeenAssistant = true
-      }
-      if (msg.type === 'user' && hasSeenAssistant) {
-        const content = msg.message.content
-        // A user message starts a new turn if it contains any non-tool_result content
-        // (text, image, or other media). Tool results alone do NOT start a new turn
-        // because they are continuations of the previous assistant tool call.
-        const startsNewUserTurn =
-          typeof content === 'string'
-            ? content.length > 0
-            : Array.isArray(content) &&
-              content.some(
-                (b: any) =>
-                  typeof b === 'string' ||
-                  (b &&
-                    typeof b === 'object' &&
-                    'type' in b &&
-                    b.type !== 'tool_result'),
-              )
-        if (startsNewUserTurn) {
-          turnBoundaries.add(i)
-        }
-      }
-    }
-  }
-
-  for (let i = 0; i < messages.length; i++) {
-    const msg = messages[i]
+  for (const msg of messages) {
     switch (msg.type) {
       case 'user':
         result.push(...convertInternalUserMessage(msg))
         break
       case 'assistant':
-        // Preserve reasoning_content unless we're before a turn boundary
-        // (i.e., from a previous user Q&A round)
-        const preserveReasoning =
-          enableThinking && !isBeforeAnyTurnBoundary(i, turnBoundaries)
-        result.push(...convertInternalAssistantMessage(msg, preserveReasoning))
+        result.push(...convertInternalAssistantMessage(msg))
         break
       default:
         break
@@ -107,17 +67,6 @@ function systemPromptToText(systemPrompt: SystemPrompt): string {
   return systemPrompt.filter(Boolean).join('\n\n')
 }
 
-/**
- * Check if index `i` falls before any turn boundary (i.e. it belongs to a previous turn).
- * A message at index i is "before" a boundary if there exists a boundary j where i < j.
- */
-function isBeforeAnyTurnBoundary(i: number, boundaries: Set<number>): boolean {
-  for (const b of boundaries) {
-    if (i < b) return true
-  }
-  return false
-}
-
 function convertInternalUserMessage(
   msg: UserMessage,
 ): ChatCompletionMessageParam[] {
@@ -213,7 +162,6 @@ function convertToolResult(
 
 function convertInternalAssistantMessage(
   msg: AssistantMessage,
-  preserveReasoning = false,
 ): ChatCompletionMessageParam[] {
   const content = msg.message.content
 
@@ -257,8 +205,10 @@ function convertInternalAssistantMessage(
             typeof tu.input === 'string' ? tu.input : JSON.stringify(tu.input),
         },
       })
-    } else if (block.type === 'thinking' && preserveReasoning) {
-      // DeepSeek thinking mode: preserve reasoning_content for tool call iterations
+    } else if (block.type === 'thinking') {
+      // DeepSeek thinking mode: always preserve reasoning_content.
+      // DeepSeek requires reasoning_content to be passed back in subsequent requests,
+      // especially when tool calls are involved (returns 400 if missing).
       const thinkingText = (block as unknown as Record<string, unknown>)
         .thinking
       if (typeof thinkingText === 'string' && thinkingText) {