docs(readme): add telemetry-zero privacy badge to hero row

Aligns the RAG-Bench badge row with the cross-repo Phase C
standardization: PyPI · CI · License · Python · EU AI Act Article ·
telemetry-zero.

The harness itself runs locally (no telemetry); LLM-as-judge metrics
depend on whichever judge model is configured. The badge marks the
harness's own zero-telemetry posture, consistent with the other
AiExponent OSS tools.

Author: apundhir

README.md

@@ -11,6 +11,7 @@
   <a href="LICENSE"><img src="https://img.shields.io/badge/License-Apache_2.0-0D5463.svg" alt="License: Apache 2.0"></a>
   <a href="https://www.python.org/downloads/"><img src="https://img.shields.io/badge/python-3.11%2B-0D5463.svg" alt="Python 3.11+"></a>
   <a href="https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32024R1689"><img src="https://img.shields.io/badge/EU%20AI%20Act-Article%2015-0D5463.svg" alt="EU AI Act Article 15"></a>
+  <a href="#privacy"><img src="https://img.shields.io/badge/telemetry-zero-0B7A4B.svg" alt="Zero telemetry"></a>
 </p>
 
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