# RetrieX Shop Query Context Fallback Hotfix

Patch-only hotfix for meta shop follow-ups such as `suche im shop`.

## Problem

After several shop meta follow-ups, the previous non-meta product/advisory question could fall outside the small context fallback window. The guard then correctly rejected `shop` as a query, but failed to derive a compact query from the last real topic.

## Fix

- Keep the language-preservation and meta-query guard behavior.
- Increase the configurable fallback question window.
- Add a separate configurable extended history budget for meta shop fallbacks.
- If the normal commerce history does not provide a concrete query, scan a larger recent history window for the last non-meta user question.
- Still compact the question into product/search tokens before sending it to Shopware.

## Expected example

`mit welchem testomat kann ich freies chlor messen` followed by `suche im shop` should resolve to a compact query such as:

```text
testomat freies chlor
```

It must not send:

```text
shop
mit welchem testomat kann ich freies chlor messen
```

## Scope

No retrieval, vector, scoring, prompt-answering, product-family special case, Testomat-specific hardcoding or Shopware API changes.
