Privacy policy: note operational log retention (from security review)

privacy-policy.md

@@ -36,6 +36,10 @@ Your **chat history is stored on our server** so you can revisit past conversati
 
 We commit not to read it. But this is a **policy commitment**, not an architectural guarantee. We're transparent about this distinction because it matters.
 
+### Operational logs
+
+Our server software keeps standard operational logs (dates, error messages, and — for account management like provisioning and welcome emails — the email addresses involved). These logs exist to run and debug the service, are kept briefly, and are not used to profile members.
+
 ## 5. Search
 
 Web search runs through our self-hosted search instance. Search queries are forwarded to the underlying search engines (e.g. DuckDuckGo), which may see them. This is inherent to how web search works.