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patch_history/RETRIEX_MEASUREMENT_EVIDENCE_GUARD_FIX_README.md

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+# RetrieX Measurement Evidence Guard Fix
+
+This patch tightens technical product-selection answers for measurement-parameter questions.
+
+## Problem
+
+The LLM could still merge similar water-treatment terms, for example treating `p-Wert` as `pH-Wert`, and then generate unsupported measurement ranges, application areas or recommendations.
+
+## Change
+
+The patch adds a generated `MEASUREMENT PARAMETER EVIDENCE CHECK` block to the final prompt when the user asks for configured measurement parameters such as pH, Redox/ORP or free chlorine.
+
+For each relevant question, the PromptBuilder now:
+
+- detects the requested measurement parameter from configurable YAML terms,
+- scans RAG/URL context and each shop product record for explicit positive evidence,
+- marks every shop record with a same-record evidence line,
+- tells the model not to recommend a product when no explicit evidence exists,
+- explicitly treats similar but non-equivalent terms such as `p-Wert`, `m-Wert`, `minus m-Wert`, `mmol/l` and alkalinity as insufficient for pH suitability.
+
+## Files changed
+
+- `src/Agent/PromptBuilder.php`
+- `src/Config/PromptBuilderConfig.php`
+- `config/retriex/prompt.yaml`
+
+## Intended behavior
+
+For `suche einen testomat der ph messen kann`, if the provided RAG/shop records only contain `p-Wert` or related alkalinity values but no explicit `pH` / `pH-Wert` evidence in the same record, the answer should start with uncertainty, for example:
+
+`Ich finde in den bereitgestellten Quellen keinen sicher belegten Testomat fuer pH-Messung.`
+
+It may still list shop hits as commercial/search hits, but not as verified pH-suitable devices.
+
+## Scope
+
+This patch does not touch retrieval, scoring, shop search, AgentRunner, SSE or LLM settings.