Add QWED verification protocol to README

[rahuldass19]

Summary

Adding QWED to the Security → Observability section.

About QWED

• What: Deterministic verification protocol for LLM outputs in production environments
• How: 8 specialized formal verification engines (SymPy for math, Z3 for logic, AST for code, SQLGlot for SQL, etc.)
• Why: Prevents hallucinations through mathematical proofs instead of probabilistic filtering
• Status: Production-ready on PyPI (pip install qwed), peer-reviewed by JOSS, archived on Zenodo

Links

• Repository: https://github.com/QWED-AI/qwed-verification
• PyPI: https://pypi.org/project/qwed/
• Paper/DOI: https://doi.org/10.5281/zenodo.18075235
• Integrations: LangChain, CrewAI, LlamaIndex

Why it fits "Observability"

QWED complements existing observability tools (Helicone, Langfuse) by providing deterministic verification guarantees for LLM outputs in production. While other tools monitor and log LLM behavior, QWED mathematically proves correctness of outputs before they reach users - critical for high-stakes production deployments.

Integration Example

from qwed_new import CodeVerifier

verifier = CodeVerifier()
result = verifier.verify_code(llm_generated_code, language="python")

if result.is_correct:
    deploy_to_production(llm_generated_code)
else:
    log_error(result.reason)