harden history find tokens and shops earch

RETRIEX_SHOP_QUERY_CONTEXT_CLEANUP_HOTFIX_README.md

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+# RetrieX Shop Query Context Cleanup Hotfix
+
+Purpose:
+- Keeps the existing language preservation and meta-query guard behavior.
+- Fixes the follow-up case where a meta command such as "suche im shop" reused the full previous user question as the Shopware search query.
+- The fallback now extracts a compact, generic shop query from recent context, e.g.:
+  - "mit welchem testomat kann ich freies chlor messen" -> "testomat freies chlor"
+
+Design constraints:
+- No retrieval changes.
+- No product-family-specific special cases.
+- No Testomat 808 / Testomat 2000 / Tritromat hardcoding.
+- Filtering terms are configurable in config/retriex/agent.yaml.
+- PHP defaults remain as safety fallback.
+
+Changed files:
+- config/retriex/agent.yaml
+- src/Agent/AgentRunner.php
+- src/Config/AgentRunnerConfig.php
+- src/Config/RetriexEffectiveConfigProvider.php
+
+Recommended after applying:
+- php bin/console cache:clear
+- php bin/console mto:agent:config:validate
+- php bin/console mto:agent:regression:test
+
+Manual regression:
+1. Ask: mit welchem testomat kann ich freies chlor messen
+2. Then: suche im shop
+3. Expected shop query should be a compact product/parameter query such as:
+   testomat freies chlor
+   It must not be the full previous prompt.