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>

src/bootstrap/state.ts

@@ -235,11 +235,6 @@ type State = {
   // microcompact is first enabled, keep sending the header so mid-session
   // GrowthBook/settings toggles don't bust the prompt cache.
   cacheEditingHeaderLatched: boolean | null
-  // Sticky-on latch for clearing thinking from prior tool loops. Triggered
-  // when >1h since last API call (confirmed cache miss — no cache-hit
-  // benefit to keeping thinking). Once latched, stays on so the newly-warmed
-  // thinking-cleared cache isn't busted by flipping back to keep:'all'.
-  thinkingClearLatched: boolean | null
   // Current prompt ID (UUID) correlating a user prompt with subsequent OTel events
   promptId: string | null
   // Last API requestId for the main conversation chain (not subagents).
@@ -414,7 +409,6 @@ function getInitialState(): State {
     afkModeHeaderLatched: null,
     fastModeHeaderLatched: null,
     cacheEditingHeaderLatched: null,
-    thinkingClearLatched: null,
     // Current prompt ID
     promptId: null,
     lastMainRequestId: undefined,
@@ -1729,14 +1723,6 @@ export function setCacheEditingHeaderLatched(v: boolean): void {
   STATE.cacheEditingHeaderLatched = v
 }
 
-export function getThinkingClearLatched(): boolean | null {
-  return STATE.thinkingClearLatched
-}
-
-export function setThinkingClearLatched(v: boolean): void {
-  STATE.thinkingClearLatched = v
-}
-
 /**
  * Reset beta header latches to null. Called on /clear and /compact so a
  * fresh conversation gets fresh header evaluation.
@@ -1745,7 +1731,6 @@ export function clearBetaHeaderLatches(): void {
   STATE.afkModeHeaderLatched = null
   STATE.fastModeHeaderLatched = null
   STATE.cacheEditingHeaderLatched = null
-  STATE.thinkingClearLatched = null
 }
 
 export function getPromptId(): string | null {