Zed

This week's release includes BYOK support for GPT-6.1 Sol, on-the-fly model selection for new subagents, automatic subagent compaction, a unified/split toggle for diffs opened from the command line, and dynamically fetched OpenCode models.

## Features

### AI

- Added an optional `model` parameter to `spawn_agent` to choose a model for that spawn instead of using the configured subagent model or inheriting the parent model, with the active model shown in its card. ([#64498](https://github.com/zed-industries/zed/pull/64498); thanks [itsfuad](https://github.com/itsfuad))
- Added BYOK support for GPT-6.1 Sol with an OpenAI API key. ([#64968](https://github.com/zed-industries/zed/pull/64968); thanks [ktKongTong](https://github.com/ktKongTong))
- Added Grok 4.7 to the SuperGrok and xAI providers and made it their recommended default. ([#64567](https://github.com/zed-industries/zed/pull/64567); thanks [raphaelluethy](https://github.com/raphaelluethy))
- Added the `agent.threads_sidebar.auto_open` setting to control whether opening a folder in an existing window also opens the Threads Sidebar. ([#64259](https://github.com/zed-industries/zed/pull/64259), [#64395](https://github.c