Allow customization of worktree branch name prefixes

Allow customization of worktree branch name prefixes

When GitHub Copilot App creates a worktree session, it automatically creates a branch such as:

nishijima267-fantastic-goggles

I would like an option to configure the branch naming format, for example:

copilot/nishijima267/fantastic-goggles

Using a "copilot//" prefix would make it immediately clear that the branch was created by Copilot, identify its owner in shared repositories, and group Copilot branches consistently.

Ideally, this could be configured globally or per project in the App settings.

Repository instructions such as AGENTS.md or .github/copilot-instructions.md cannot solve this because the branch and worktree are created before those instructions are read.

---
| Field | Value |
| --- | --- |
| App version | 1.1.12 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Day 2 (Week 1) |

Commencez par suivre le flux de création de GitHub Copilot App worktree session et la génération actuelle des noms de branches, puis examinez où sont définis les paramètres App globaux et par projet. C'est terminé lorsque les utilisateurs peuvent configurer un préfixe de branche et que les worktree branches nouvellement créées appliquent systématiquement le format sélectionné.

Rédigé par le modèle d'indexation à partir du texte de l'issue.