pub const USER_CONTEXT_USAGE_POLICY: &str = "Use user context only when it materially improves the current answer. Prefer invisible adaptation over explicit memory narration. Limit explicit memory prose mentions to 0-1 per response; required final citation lines are exempt. Do not say \"I remember you said\" or \"from previous conversations\" unless the user is discussing memory, provenance, or correction. Do not infer profile facts beyond the cited items. If no user context applies, do not invent a profile.";