I ran into two usability problems in Copilot workspace sessions:

I ran into two usability problems in Copilot workspace sessions:

1. Ignored files cannot be edited from the Files window
Files like app/etc/env.php are intentionally git-ignored because they configure the local environment. In Magento projects these files are essential for local development. The Files window/editor can hide or make ignored files read-only, which makes local environment setup harder than necessary. There should be a way to show and edit ignored local files, preferably with a clear warning that they are ignored/sensitive and should not be committed.

2. Changes window compares against master instead of the checked-out branch upstream
In a session checked out on a feature branch, the Changes window compares the branch against origin/master. That is not always useful. When working on an existing feature branch, I usually want to see only what changed locally after the last commit, or the difference between my local branch and origin/. Comparing everything to master shows the whole feature branch history and makes it hard to see my actual current changes.

---
| Field | Value |
| --- | --- |
| App version | 1.1.12 |
| OS | macOS 26.2.0 |
| Theme | Monochrome |
| Path | /chat |
| Tenure | Week 2 |

使用一个被忽略的本地文件（例如 app/etc/env.php）和一个已 checkout 的 feature branch，在 Files 和 Changes 窗口中复现这两份报告。阅读 workspace session 处理逻辑，了解文件的可见性/可编辑性以及 branch 比较行为；完成标准是：被忽略的文件可以在明确警告下编辑，并且 Changes 显示所选 branch 相关的本地或 upstream diff。

由索引模型根据 Issue 内容生成。