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_

Comece reproduzindo o comportamento com /init ou uma solicitação de geração de AGENTS.md, comparando as instruções resultantes do repositório com as instruções personalizadas locais descritas no relatório. Considera-se concluído quando orientações genéricas locais em Markdown não forem mais incorporadas como fatos específicos do repositório.

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