fix shop research intent

RETRIEX_SHOP_ADVISORY_INTENT_FIX_README.md

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+# RetrieX shop advisory intent fix
+
+## Problem
+
+The prompt
+
+```text
+welcher pockettester ist für Redox messung gut
+```
+
+was classified as a purely technical RAG question because the factual guard matched
+question wording such as `welcher` plus technical wording such as `Messung`.
+As a result no Shopware search was executed. The later follow-up
+
+```text
+suche im shop
+```
+
+then had to recover a shop query from history/client context, which remained fragile.
+
+## Fix
+
+This patch keeps the factual RAG guard for technical questions, but lets clear product
+advisory prompts pass into commerce detection when both conditions are true:
+
+1. The prompt contains an advisory term such as `gut`, `geeignet`, `empfehl...`.
+2. The prompt contains a product/device class signal such as `pockettester`,
+   `messgerät`, `handmessgerät`, etc.
+
+This means:
+
+- `Was ist der niedrigste Grenzwert ... Testomat ... Wasserhärte?` stays RAG-only.
+- `mit welchem indikator wird der wert gemessen` stays RAG-only.
+- `was kostet der indikator` stays commerce/product search.
+- `welcher pockettester ist für Redox messung gut` now triggers commerce search directly.
+
+## Changed files
+
+```text
+src/Intent/CommerceIntentLite.php
+src/Config/CommerceIntentConfig.php
+config/retriex/intent.yaml
+config/retriex/agent.yaml
+```
+
+## Validation performed
+
+```bash
+php -n -l src/Intent/CommerceIntentLite.php
+php -n -l src/Config/CommerceIntentConfig.php
+```
+
+Additional local intent check:
+
+```text
+Was ist der niedrigste Grenzwert ... => none
+mit welchem indikator ... => none
+was kostet der indikator => product_search
+welcher pockettester ist für Redox messung gut => product_search
+suche im shop => product_search
+suche im shop nach redox messung => product_search
+welcher Grenzwert kann mit dem Testomat 808 gemessen werden => none
+welches Messgerät ist für Redox Messung geeignet => product_search
+```