Add LLM-Evaluations semantic anchor

[Copilot]

Adds the LLM-Evaluations semantic anchor, covering the established frameworks, benchmark suites, and metrics used to assess Large Language Model capabilities.

New Files

• docs/anchors/llm-evaluations.adoc — English anchor with concepts: benchmark suites (MMLU, HellaSwag, HumanEval, BIG-Bench, GSM8K), evaluation metrics (perplexity, BLEU, ROUGE, pass@k), HELM, Chatbot Arena/Elo, Open LLM Leaderboard, red-teaming, and contamination detection
• docs/anchors/llm-evaluations.de.adoc — German translation

Updated Files

• website/public/data/anchors.json — Entry added (105 anchors total); regenerated via extract-metadata.js
• skill/semantic-anchor-translator/references/catalog.md — Entry appended to the Testing & Quality section

Metadata:

• Category: testing-quality
• Roles: data-scientist, software-developer, qa-engineer, software-architect
• Proponents: Percy Liang (Stanford HELM), EleutherAI (Open LLM Leaderboard), LMSYS (Chatbot Arena)
• Related: chain-of-thought, sota, mutation-testing

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Anchor Proposal]: LLM-Evaluations</issue_title>
<issue_description>### Proposed Term

LLM-Evaluations

Context (Optional)

No response

Pre-submission Checklist

• I have searched existing anchors and this term is not already included
• This term refers to a well-established concept (not something I invented)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Anchor Proposal]: LLM-Evaluations #275

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