- Strip body-prefix severity in normalize_first_line so pattern_id is stable across body-prefix vs bracketed-only variants. - Lookback for inferred attribution now counts raw file lines (per spec literal), not body-line budget across entries. - Document hash truncation (64-bit) and direct-attribution priority. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>