条件化 thinking block 剥离，仅跨供应商场景触发#182
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将 thinking block 剥离从 AnthropicVendor._prepare_request()（无条件执行） 提升至 _RouteExecutor._prepare_body_for_tier()（条件执行），基于请求规范化 信号（has_cross_vendor_signals）和会话历史信号（provider_state）判断是否 需要剥离。纯 Anthropic 会话中 thinking blocks 保持原样以维持上下文连续性。 - 新增 NormalizationResult.has_cross_vendor_signals 属性 - 迁移 strip_thinking_blocks() 至 request_normalizer.py - 新增 _RouteExecutor._needs_thinking_strip() 条件判断方法 - 补充 count_tokens 端点的安全剥离（无会话上下文时回退到始终剥离） 🤖 Generated with [Claude Code](https://github.com/claude), [CodeX](https://openai.com), [Gemini](https://github.com/apps/gemini-code-assist) Co-Authored-By: Aurelius Huang<threefish.ai@gmail.com>
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概要
将 thinking block 剥离从
AnthropicVendor._prepare_request()（无条件执行）提升至_RouteExecutor._prepare_body_for_tier()（条件执行），解决纯 Anthropic 会话中 thinking blocks 被不必要剥离的问题。变更内容
has_cross_vendor_signals）和会话历史信号（provider_state）判断是否需要剥离，纯 Anthropic 会话保留 thinking blocks 以维持上下文连续性compat_session_store未配置（session_record为None）时，回退到始终剥离，确保向后兼容count_tokens端点加固: 因无会话上下文，安全剥离防止跨供应商 signature 导致 400 错误_strip_misplaced_tool_results仍在AnthropicVendor._prepare_request()中保持不变测试验证
_needs_thinking_strip条件判断测试_prepare_body_for_tierthinking 剥离行为测试has_cross_vendor_signals属性测试strip_thinking_blocks函数测试🤖 Generated with Claude Code, CodeX, Gemini