docs: CLAUDE.md header version drift fix — 2.18 -> 2.20

Header «Версия» line lagged at 2.18 while §9 already carried v2.19
(factor-analysis extension) and v2.20 (phase 1.1) entries — pre-existing
drift from f7f37fb. Header now reflects actual latest version; v2.18
summary demoted to «v2.18 наследие». Full per-version detail stays in §9.

Через /claude-md-management:claude-md-improver (§5 п.10).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/observer/STATUS.md

@@ -1,6 +1,6 @@
 # Brain Status (auto-generated)
 
-Last updated: 2026-05-19T08:47:41.763Z
+Last updated: 2026-05-19T10:39:07.818Z
 
 | Контролёр | Состояние | Детали |
 |---|---|---|
@@ -8,11 +8,11 @@ Last updated: 2026-05-19T08:47:41.763Z
 | C2 Cross-ref consistency | ✅ | [cross-ref-checker] OK — 0 drift in 4 files |
 | C3 Observer-of-observer | ✅ | [observer-of-observer] OK — last read 0 week(s) ago |
 | C4 Сигнальный статус | ✅ | This file (self-reference) |
-| C5 Observer-coverage | ✅ | 18 episode(s), 954 recent commit(s) · Stop-hook + post-commit OK |
+| C5 Observer-coverage | ⚠️ | 977 commit(s) in the last 2 weeks but 0 observer episodes this month · Stop-hook + post-commit OK |
 
 ## Метрики (информационные, не алерты)
 
-- Observer evidence: 18 episodes this month, 0 observer_error markers, 0 PII matches before filter
+- Observer evidence: 0 episodes this month, 0 observer_error markers, 0 PII matches before filter
 - Использование узлов: см. `/brain-retro` (раз в спринт). **Неиспользованные узлы — не проблема** (capability-readiness; см. memory `feedback_brain_unused_tools_not_problem` — outside-repo memory store).
 
 ## Алерт-индикаторы