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RETRIEX_PATCH_4_TEMPLATE_VALIDATION_HOTFIX_README.md

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+# RetrieX Patch 4 Hotfix: SearchRepair pattern-template validation
+
+This hotfix fixes an overly strict placeholder validation in `SearchRepairConfig`.
+
+## Problem
+
+Patch 4 moved SearchRepair patterns to YAML. The new validator rejected every rendered template that still contained a `{` character. This also rejected valid regex quantifiers such as `\d{1,5}`.
+
+Symfony error example:
+
+```text
+RetrieX search repair pattern template "patterns.accessory_candidate_template" contains unresolved placeholders.
+```
+
+## Fix
+
+The validator now only treats named placeholders like `{terms}` or `{model}` as unresolved. Regex quantifiers such as `{1,5}` remain valid.
+
+No retrieval, prompt, shop, scoring, or SearchRepair behavior is changed.
+
+## After applying
+
+```bash
+php bin/console cache:clear
+php bin/console mto:agent:config:validate
+php bin/console mto:agent:config:audit-source --details
+php bin/console mto:agent:regression:test
+```