Custom instructions leak into repository analysis

### Describe the bug

Whenever I ask copilot to analyze a repository and e.g. create an instruction file it seems that it is leaking local instructions into the context and taking them for facts for this particular repository.

This then can lead of general part in the instructions, e.g. I have

```
### Markdown

- Start each sentence on a new line to improve diff readability.
- Format tables with aligned spaces so they are readable as plain text.
```

that now suddenly is in-cooperated whenever I use e.g. `/init` or asking for an `AGENTS.md` file or enhance/create an inital readme for the project.

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

Comienza reproduciendo el comportamiento con /init o una solicitud de generación de AGENTS.md, comparando las instrucciones resultantes del repositorio con las instrucciones personalizadas locales descritas en el informe. Se considera completado cuando las indicaciones genéricas de Markdown locales ya no se incorporan como hechos específicos del repositorio.

Escrito por el modelo de indexación a partir del texto del issue.