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description: Prompt version history — what changed and why
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## rio-system-v1 (2026-03-31)
- Initial extraction from inline string in telegram/response.py
- RESEARCH tag tightened: "ONLY use when user explicitly asks about recent activity"
- No structural changes from deployed version

## Planned
- rio-system-v2: Query classification injected into system prompt (Layer 2)
- eval-grounding-v1: Haiku grounding check prompt (Layer 3)