DeepSeek Harness dsh-v0.1.2-alpha.4

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• 父 Agent 与可持续子 Agent 可通过 send_message 双向传递后续消息，取代单向 report 工具 @Dudu-0223

• 自定义模型发现复用 Profile 请求头；模型目录支持搜索和筛选 @LegGasai
• 界面优化圆角、描边、轮次导航、投影效果 @yixiangihsiang, @LegGasai
• 改善超长会话在流式回复、界面布局、导航预览场景的渲染开销 @imccyu

• Python SDK、Headless、ACP 与自定义 Profile 默认提供 web_fetch @koalazf99
• Web PTC Mode 默认不再向模型提供通用 workflow 工具 @koalazf99
• Session.events 被按需读取 API seq、eventAt() 和 snapshotEvents() 取代 @kermanx
• SessionSeq / SessionLogOffset 强类型区分，请开发者关注兼容性 @tianyicui

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• Let parent Agents and continuable child Agents exchange follow-up messages through send_message, replacing the one-way report tool by @Dudu-0223

• Reuse Profile request headers for custom model discovery; add search and filtering to the model catalog by @LegGasai
• Refine interface corners, borders, turn navigation, and shadows by @yixiangihsiang and @LegGasai
• Reduce rendering overhead in very long conversations during response streaming, interface layout, and navigation previews by @imccyu

• Enable web_fetch by default for the Python SDK, Headless, ACP, and custom Profiles by @koalazf99
• Stop exposing the general-purpose workflow tool by default in Web PTC Mode by @koalazf99
• Replace Session.events with on-demand read APIs: seq, eventAt(), and snapshotEvents() by @kermanx
• Distinguish SessionSeq and SessionLogOffset with strong types; developers should should pay attention to compatibility by @tianyicui

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Full Changelog: https://github.com/deepseek-ai/deepseek-harness/compare/dsh-v0.1.2-alpha.3...dsh-v0.1.2-alpha.4