# RetrieX Patch 16c - Core Pattern Audit Allowed Literal Fix

## Purpose

Patch 16c fixes the last two false-positive warnings from the warn-only core pattern audit.

The remaining warnings were technical markdown-heading regex parsers for product-title metadata, not hardcoded domain decision logic. The p16b allowlist used a semantic whitespace regex and therefore did not match the escaped PHP regex literal as it appears in source code.

## Changes

- Updates `config/retriex/governance.yaml`.
- Adjusts the allowlist patterns for the technical `Produkt\s+Titel` markdown-heading parser so they match escaped PHP source literals.
- Adds no runtime behavior change.
- Adds no strict validation.
- Changes no retrieval, prompt, commerce, scoring, or ranking logic.

## Expected result

`bin/console mto:agent:config:audit-patterns --details` should return `OK` unless new domain-sensitive string literals were introduced elsewhere.

## Validation

Run:

```bash
bin/console mto:agent:config:validate
bin/console mto:agent:regression:test
bin/console mto:agent:config:audit-source --details
bin/console mto:agent:config:audit-patterns --details
```
