Closes brain-retro #9 candidate 1: classifier recognized bugfix via
PATTERN 4 (→ systematic-debugging) but didn't extend to chain with
Pest #18 for test-first regression coverage.
Real-world driver: adr-judge.py catastrophic backtracking fix (commit
1e1457eb) — should have gone through TDD via Pest, not direct edit.
Reviewer Section A in retro #9 flagged this.
PATTERN 6 extends PATTERN 4 with explicit chain recommendation when
fix touches live code (regex/parser/hook/race/perf).
Дмитрий
84d0134875
