Error journal
This is an append-only record. Each entry captures a systematic error, its root cause, and the Harness fix that prevents recurrence. The error journal is part of Harness Correction Development — when the agent makes a mistake, fix the rules, not just the output.
Format
## [YYYY-MM-DD] [Error class] Brief description
**What happened**: [One sentence]
**Root cause**: [Why the Harness didn't prevent this]
**Harness fix**: [What file was updated and how]
**Prevention**: [How the updated rule prevents recurrence]