Pi v0.55.2 - 更新日志

### 新功能 - 扩展现在可以通过 `pi.unregisterProvider(name)` 动态移除自定义提供商，并恢复被覆盖的内置模型，无需执行 `/reload`（[docs](https://github.com/badlogic/pi-mono/blob/main/packages/coding-agent/docs/custom-provider.md)）。 - 在初始扩展加载阶段之外调用 `pi.registerProvider()`（例如从命令处理器中调用）时，该配置将立即生效，从而免除了延迟注册后需要 `/reload` 的步骤。 ### 新增 - `pi.unregisterProvider(name)` 可从注册表中移除动态注册的提供商及其模型，无需 `/reload`。被该提供商覆盖的内置模型将恢复（[#1669](https://github.com/badlogic/pi-mono/pull/1669) by [@aliou](https://github.com/aliou)）。 ### 修复 - 在初始扩展加载阶段之后调用 `pi.registerProvider()`（例如从命令处理器中调用）时，该配置将立即生效。此前注册信息会滞留在待处理队列中，直到下次 `/reload` 才会刷新（[#1669](https://github.com/badlogic/pi-mono/pull/1669) by [@aliou](https://github.com/aliou)）。 - 修复了从任何助手消息之前的节点分叉时出现重复会话头的问题。当分叉路径不包含助手消息时，`createBranchedSession` 现在会将文件创建延迟至 `_persist()` 中执行，以符合 `newSession()` 的契约（[#1672](https://github.com/badlogic/pi-mono/pull/1672) by [@w-winter](https://github.com/w-winter)）。 - 修复了进程挂起时（例如通过 `ctrl+z`）仍向 pi 发送 SIGINT 信号的问题，该问题可能导致恢复运行时终端状态损坏（[#1668](https://github.com/badlogic/pi-mono/pull/1668) by [@aliou](https://github.com/aliou)）。 - 修复了 Z.ai 思维控制使用了错误的参数名的问题，该问题会导致思维功能始终开启，从而浪费 token 和增加延迟（[#1674](https://github.com/badlogic/pi-mono/pull/1674) by [@okuyam2y](https://github.com/okuyam2y)） - 修复了 Anthropic 流式传输期间 `redacted_thinking` 块被静默丢弃的问题，以及相关的交错思维（interleaved-thinking）beta 标头和温度参数随扩展思维一同发送的问题（[#1665](https://github.com/badlogic/pi-mono/pull/1665) by [@tctev](https://github.com/tctev)） - 修复了 `(external, cli)` 用户代理（user-agent）标志导致 Anthropic 设置令牌端点返回 401 错误的问题（[#1677](https://github.com/badlogic/pi-mono/pull/1677) by [@LazerLance777](https://github.com/LazerLance777)） - 修复了当 OpenAI 兼容提供商返回的块中不包含 `choices` 数组时导致程序崩溃的问题（[#1671](https://github.com/badlogic/pi-mono/issues/1671)）

### New Features - Extensions can dynamically remove custom providers via `pi.unregisterProvider(name)`, restoring any built-in models that were overridden, without requiring `/reload` ([docs](https://github.com/badlogic/pi-mono/blob/main/packages/coding-agent/docs/custom-provider.md)). - `pi.registerProvider()` now takes effect immediately when called outside the initial extension load phase (e.g. from a command handler), removing the need for `/reload` after late registrations. ### Added - `pi.unregisterProvider(name)` removes a dynamically registered provider and its models from the registry without requiring `/reload`. Built-in models that were overridden by the provider are restored ([#1669](https://github.com/badlogic/pi-mono/pull/1669) by [@aliou](https://github.com/aliou)). ### Fixed - `pi.registerProvider()` now takes effect immediately when called after the initial extension load phase (e.g. from a command handler). Previously the registration sat in a pending queue that was never flushed until the next `/reload` ([#1669](https://github.com/badlogic/pi-mono/pull/1669) by [@aliou](https://github.com/aliou)). - Fixed duplicate session headers when forking from a point before any assistant message. `createBranchedSession` now defers file creation to `_persist()` when the branched path has no assistant message, matching the `newSession()` contract ([#1672](https://github.com/badlogic/pi-mono/pull/1672) by [@w-winter](https://github.com/w-winter)). - Fixed SIGINT being delivered to pi while the process is suspended (e.g. via `ctrl+z`), which could corrupt terminal state on resume ([#1668](https://github.com/badlogic/pi-mono/pull/1668) by [@aliou](https://github.com/aliou)). - Fixed Z.ai thinking control using wrong parameter name, causing thinking to always be enabled and wasting tokens/latency ([#1674](https://github.com/badlogic/pi-mono/pull/1674) by [@okuyam2y](https://github.com/okuyam2y)) - Fixed `redacted_thinking` blocks being silently dropped during Anthropic streaming, and related issues with interleaved-thinking beta headers and temperature being sent alongside extended thinking ([#1665](https://github.com/badlogic/pi-mono/pull/1665) by [@tctev](https://github.com/tctev)) - Fixed `(external, cli)` user-agent flag causing 401 errors on Anthropic setup-token endpoint ([#1677](https://github.com/badlogic/pi-mono/pull/1677) by [@LazerLance777](https://github.com/LazerLance777)) - Fixed crash when OpenAI-compatible provider returns a chunk with no `choices` array ([#1671](https://github.com/badlogic/pi-mono/issues/1671))