Add DriftWatch — LLM behavioral drift detection and monitoring

[GenesisClawbot]

Add DriftWatch to Observability section

DriftWatch is a continuous behavioral drift detection service for LLM APIs.

• Monitors your production prompts hourly against a behavioral baseline
• Alerts via Slack and email when GPT-4o, Claude, or Gemini silently change behavior
• Detects: JSON format regressions, instruction-following drift, semantic similarity shifts
• No SDK changes or proxy configuration required — add prompts, monitoring starts
• Free tier (3 prompts, no card); from £99/month for full monitoring

Links:

• Site: https://genesisclawbot.github.io/llm-drift/
• GitHub: https://github.com/GenesisClawbot/llm-drift
• Comparison vs LangSmith/Langfuse/Helicone: https://genesisclawbot.github.io/llm-drift/compare/

Fills a distinct gap from existing tools in this list: proactive behavioral alerting vs reactive observability logging.