diff --git a/.claude/skills/brain-retro/references/aggregation-template.md b/.claude/skills/brain-retro/references/aggregation-template.md
index e62c38c9..dbe4c8ee 100644
--- a/.claude/skills/brain-retro/references/aggregation-template.md
+++ b/.claude/skills/brain-retro/references/aggregation-template.md
@@ -70,10 +70,14 @@ For each factor below, render a table: factor value × outcome counts
 - `observerErrorCount` from the analyzer — observer_error markers in the period.
   Non-zero = the observer failed silently somewhere; investigate.
 
-## Canonical chains L1–L12 hit rate
+## Canonical chains L1–L13+ hit rate (from analyzer `factorMatrix.chain_ref`)
 
-| chain | times | notes |
-|---|---|---|
+| chain | times | outcome split | notes |
+|---|---|---|---|
+
+Each node may belong to several L (a multi-chain episode is counted in each).
+`null` = episodes outside any chain (`direct` + nodes not in L1–L13+) — **not a
+problem** per `memory/feedback_brain_unused_tools_not_problem`.
 
 ## Improvised chains (path_type=improvised, repeated ≥2)
 
diff --git a/docs/automation-graph.html b/docs/automation-graph.html
index 1d09bea4..e160861c 100644
--- a/docs/automation-graph.html
+++ b/docs/automation-graph.html
@@ -580,6 +580,40 @@ const NODE_DETAILS = {
     [{ name: 'billing-audit', cond: 'выручка C6 → налог.база C7' }, { name: 'finance plugin', cond: 'US-механика' }]
   ),
 
+  // ── A1 BACKEND-TOOLING (20.05.2026, ADR-013) ──
+  rector: nd(
+    'Composer dev-dep (Rector + rector-laravel): авто-рефакторинг и version-upgrade PHP-кода — dead-code, code-quality наборы, апгрейды под версию Laravel.',
+    'При «обнови/почини/рефактори backend-код», апгрейде Laravel-версии, удалении мёртвого кода. Запуск manual/CI (composer rector / rector:fix).',
+    'Composer dev-dep, app/rector.php (deadCode+codeQuality conservative). manual/CI — НЕ блокирующий lefthook (dry-run baseline 16 файлов). Не UI → вне R6/R14. Tooling §4.39 #64, CLAUDE.md §3.3 #64, ADR-013.',
+    [{ name: 'Tooling', cond: '§4.39 #64 — реестр' }],
+    [{ name: 'BT1', cond: '↔ Pint трансформация vs стиль' }, { name: 'BT2', cond: '↔ Larastan чинит vs находит' }, { name: 'BT3', cond: '↔ deptrac vs граф слоёв' }],
+    [{ name: 'PHP Insights', cond: 'backend-quality chain L14' }, { name: 'Larastan', cond: 'L14 типы' }]
+  ),
+  php_insights: nd(
+    'Composer dev-dep: метрики качества кода — complexity / architecture / maintainability (cyclomatic, code smells, распределение архитектуры).',
+    'При «оцени качество/сложность кода», «где код запутан», в портальном аудите. on-demand/CI (composer insights).',
+    'Composer dev-dep, app/config/insights.php (SyntaxCheck removed — Windows-краш, style-ось off — владелец Pint). on-demand/CI — НЕ блокирующий (BT9). Не UI → вне R6/R14. Tooling §4.40 #65, CLAUDE.md §3.3 #65, ADR-013.',
+    [{ name: 'Tooling', cond: '§4.40 #65 — реестр' }],
+    [{ name: 'BT4', cond: 'style/code оси off — уникум complexity+architecture' }, { name: 'BT9', cond: 'не блокирующий — без четверного гейта' }],
+    [{ name: 'Rector', cond: 'backend-quality chain L14' }, { name: 'Larastan', cond: 'L14 типы' }]
+  ),
+  backend_patterns: nd(
+    'Self-authored скил: backend-конвенции Лидерры — слоистость controller→service→job, RLS-aware Eloquent, деньги bcmath/LedgerService, идемпотентные джобы, partition-aware запросы.',
+    'При «как писать backend в Лидерре», «паттерн контроллера/сервиса/джоба», scaffolding новой backend-фичи.',
+    'Свой project-скил .claude/skills/laravel-backend-patterns/ (линтуется, LINT1). Не UI → вне R6/R14. Tooling §4.41 #66, CLAUDE.md §3.3 #66, ADR-013.',
+    [{ name: 'Tooling', cond: '§4.41 #66 — реестр' }],
+    [{ name: 'BT5', cond: '≠ architecture-patterns #38 (generic)' }, { name: 'BT6', cond: '≠ billing-audit #62 (аудит)' }],
+    [{ name: 'billing-audit', cond: '«как писать» ↔ «аудит денег»' }, { name: 'Boost', cond: 'Eloquent-контекст' }]
+  ),
+  nightowl: nd(
+    'Self-hosted runtime-телеметрия (laravel/nightwatch + nightowl-agent): коррелированный трейс request↔job↔query↔cache в свой PostgreSQL. DEFERRED.',
+    'DEFERRED — при появлении Linux/боевого сервера (Б-1). Сейчас не маршрутизировать (нет pcntl/posix на Windows, OSS без MCP, hosted = 152-ФЗ).',
+    'DEFERRED pending-слот (как Sentry #34 / Figma #44 / Jupyter #50). Spike docs/backend/nightowl-spike.md. Не UI → вне R6/R14. Tooling §4.42 #67, CLAUDE.md §3.3 #67, ADR-013.',
+    [{ name: 'Tooling', cond: '§4.42 #67 — реестр' }],
+    [{ name: 'BT7', cond: '↔ Sentry трейс vs ошибки' }, { name: 'BT8', cond: '↔ Pail/Boost трейс vs tail/снапшот' }],
+    [{ name: 'Sentry', cond: 'трейс ↔ ошибки (ADR-013)' }]
+  ),
+
   // ── СКИЛЫ SUPERPOWERS ────────────────────────────
   sk_brainstorm: nd(
     'Продумывает задачу вместе с заказчиком, формулирует варианты A/B/C и согласует дизайн до написания кода.',
@@ -1807,6 +1841,12 @@ const NODE_META = {
   billing_audit:  { since: '20.05.2026', changed: '—', uses: 0, usesSrc: 'новый узел' },
   ru_tax:         { since: '20.05.2026', changed: '—', uses: 0, usesSrc: 'новый узел' },
 
+  // ── A1 BACKEND-TOOLING (20.05.2026, ADR-013) ──
+  rector:           { since: '20.05.2026', changed: '—', uses: 0, usesSrc: 'новый узел' },
+  php_insights:     { since: '20.05.2026', changed: '—', uses: 0, usesSrc: 'новый узел' },
+  backend_patterns: { since: '20.05.2026', changed: '—', uses: 0, usesSrc: 'новый узел' },
+  nightowl:         { since: '20.05.2026', changed: '—', uses: 0, usesSrc: 'новый узел (DEFERRED)' },
+
   // ── BRAIN GOVERNANCE iter9 (19.05.2026, ADR-011) ──
   // uses: observer_stophook=31 эпизодов; lh_obs_obs/status_md/obs_cov=112 коммитов с 19.05
   // (glob-less, каждый коммит); lh_l1watcher=10, lh_crossref=13 (коммиты по glob с 19.05);
diff --git a/docs/observer/STATUS.md b/docs/observer/STATUS.md
index d9da907a..2cf07844 100644
--- a/docs/observer/STATUS.md
+++ b/docs/observer/STATUS.md
@@ -1,6 +1,6 @@
 # Brain Status (auto-generated)
 
-Last updated: 2026-05-21T01:29:26.077Z
+Last updated: 2026-05-21T01:53:48.034Z
 
 | Контролёр | Состояние | Детали |
 |---|---|---|
@@ -8,11 +8,12 @@ Last updated: 2026-05-21T01:29:26.077Z
 | 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 | ✅ | 37 episode(s) this month · Stop-hook + post-commit OK |
+| C5 Observer-coverage | ⚠️ | 16 episode(s) this month · .git/hooks/post-commit not installed (run: npx lefthook install --force) |
+| C6 Chain map sync | ✅ | [chain-map-checker] OK — 14 chains in sync |
 
 ## Метрики (информационные, не алерты)
 
-- Observer evidence: 37 episodes this month, 0 observer_error markers, 36 PII matches before filter
+- Observer evidence: 16 episodes this month, 0 observer_error markers, 0 PII matches before filter
 - Legacy v1 episodes (not in factor analysis): 5
 - Last /brain-retro: 2 day(s) ago
 - 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).
diff --git a/lefthook.yml b/lefthook.yml
index 0a9544f9..fff6e345 100644
--- a/lefthook.yml
+++ b/lefthook.yml
@@ -196,6 +196,16 @@ pre-commit:
         observer-coverage-checker reports a gap (coverage or registration).
         See docs/observer/STATUS.md C5 row for details.
 
+    # 16. observer-chain-map-checker — brain governance C6 (chain attribution).
+    # Сверяет tools/observer-chain-map.json с таблицей L1-L13 в
+    # docs/routing-off-phase.md по множествам L-номеров (обе стороны). Блокирует
+    # коммит при дрейфе: несуществующая L в JSON или потерянная цепочка из .md.
+    - name: observer-chain-map-checker
+      run: node tools/observer-chain-map-checker.mjs
+      fail_text: |
+        observer-chain-map-checker: дрейф chain-map <-> routing-off-phase.md.
+        Обновите tools/observer-chain-map.json под таблицу L1-LN.
+
 # Post-commit: regenerate STATUS.md dashboard (informational, not gate)
 post-commit:
   parallel: false
diff --git a/tools/brain-retro-analyzer.mjs b/tools/brain-retro-analyzer.mjs
index 9727b35f..b4ed2008 100644
--- a/tools/brain-retro-analyzer.mjs
+++ b/tools/brain-retro-analyzer.mjs
@@ -177,6 +177,18 @@ export function buildFactorMatrix(episodesWithOutcome) {
       matrix[fname][val][outcome] = (matrix[fname][val][outcome] || 0) + 1;
     }
   }
+  // chain_ref is multi-value: a multi-chain episode counts once per chain;
+  // null/absent → key "null". Handled outside FACTOR_FNS (single-value loop).
+  matrix.chain_ref = {};
+  for (const e of episodesWithOutcome) {
+    const cr = (e.primary_rationale || {}).chain_ref;
+    const outcome = e._inferredOutcome || 'unknown';
+    const keys = Array.isArray(cr) && cr.length ? cr : ['null'];
+    for (const k of keys) {
+      matrix.chain_ref[k] = matrix.chain_ref[k] || {};
+      matrix.chain_ref[k][outcome] = (matrix.chain_ref[k][outcome] || 0) + 1;
+    }
+  }
   return matrix;
 }
 
diff --git a/tools/brain-retro-analyzer.test.mjs b/tools/brain-retro-analyzer.test.mjs
index ffb59ce8..ca19b156 100644
--- a/tools/brain-retro-analyzer.test.mjs
+++ b/tools/brain-retro-analyzer.test.mjs
@@ -230,6 +230,23 @@ describe('buildFactorMatrix — session_segment_turn axis rename (Task 14)', ()
   });
 });
 
+describe('buildFactorMatrix — chain_ref axis (multi-chain)', () => {
+  it('counts a multi-chain episode in each chain and null for direct', () => {
+    const m = buildFactorMatrix([
+      { _inferredOutcome: 'success', primary_rationale: { node_chosen: 'discovery-interview', chain_ref: ['L1', 'L2'] } },
+      { _inferredOutcome: 'unknown', primary_rationale: { node_chosen: 'direct', chain_ref: null } },
+    ]);
+    expect(m.chain_ref.L1).toEqual({ success: 1 });
+    expect(m.chain_ref.L2).toEqual({ success: 1 });
+    expect(m.chain_ref.null).toEqual({ unknown: 1 });
+  });
+
+  it('chain_ref axis present via analyze()', () => {
+    const result = analyze([ep({ primary_rationale: { node_chosen: 'billing-audit', chain_ref: ['L13'], task_classification: 'other' } })]);
+    expect(result.factorMatrix).toHaveProperty('chain_ref');
+  });
+});
+
 describe('inferOutcome — neutral → soft_success (Task 16)', () => {
   it('returns soft_success when next prompt is neutral', () => {
     const a = { events: [] };
diff --git a/tools/observer-chain-detector.mjs b/tools/observer-chain-detector.mjs
new file mode 100644
index 00000000..606c1de1
--- /dev/null
+++ b/tools/observer-chain-detector.mjs
@@ -0,0 +1,24 @@
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const DEFAULT_MAP_PATH = join(__dirname, 'observer-chain-map.json');
+
+/** Load the node->chains map. Throws on missing/invalid JSON (caller handles). */
+export function loadChainMap(path = DEFAULT_MAP_PATH) {
+  const raw = JSON.parse(readFileSync(path, 'utf8'));
+  const map = new Map();
+  for (const [node, chains] of Object.entries(raw)) {
+    if (node === '_note') continue;
+    if (Array.isArray(chains) && chains.length > 0) map.set(node, chains);
+  }
+  return map;
+}
+
+/** node_chosen -> array of L-chains, or null if not in any chain. */
+export function chainsFor(node, map) {
+  if (!node || typeof node !== 'string') return null;
+  const chains = map.get(node);
+  return chains && chains.length > 0 ? chains : null;
+}
diff --git a/tools/observer-chain-detector.test.mjs b/tools/observer-chain-detector.test.mjs
new file mode 100644
index 00000000..8ad6708f
--- /dev/null
+++ b/tools/observer-chain-detector.test.mjs
@@ -0,0 +1,32 @@
+import { describe, it, expect } from 'vitest';
+import { loadChainMap, chainsFor } from './observer-chain-detector.mjs';
+
+const map = loadChainMap();
+
+describe('chainsFor', () => {
+  it('returns chain array for a single-chain node', () => {
+    expect(chainsFor('billing-audit', map)).toEqual(['L13']);
+  });
+
+  it('returns all chains for a multi-chain node', () => {
+    expect(chainsFor('discovery-interview', map)).toEqual(['L1', 'L2']);
+  });
+
+  it('returns null for direct', () => {
+    expect(chainsFor('direct', map)).toBeNull();
+  });
+
+  it('returns null for an unknown node', () => {
+    expect(chainsFor('totally-unknown-xyz', map)).toBeNull();
+  });
+
+  it('returns null for empty/null/undefined', () => {
+    expect(chainsFor('', map)).toBeNull();
+    expect(chainsFor(null, map)).toBeNull();
+    expect(chainsFor(undefined, map)).toBeNull();
+  });
+
+  it('ignores the _note metadata key', () => {
+    expect(chainsFor('_note', map)).toBeNull();
+  });
+});
diff --git a/tools/observer-chain-map-checker.mjs b/tools/observer-chain-map-checker.mjs
new file mode 100644
index 00000000..eb53f546
--- /dev/null
+++ b/tools/observer-chain-map-checker.mjs
@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+/**
+ * Brain governance controller C6 — chain-map sync checker.
+ * Verifies tools/observer-chain-map.json against the L1-L13 table in
+ * docs/routing-off-phase.md. Sync is checked by L-number sets (both
+ * directions), not by node names — node_chosen values (skill-id) differ
+ * from the human display names in the .md table. Pure fs/regex, no LLM.
+ */
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const MD_PATH = join(__dirname, '..', 'docs', 'routing-off-phase.md');
+const JSON_PATH = join(__dirname, 'observer-chain-map.json');
+
+/** Extract the set of L-numbers ("L1".."L13") from the routing-off-phase.md table. */
+export function parseChainsFromMd(md) {
+  const set = new Set();
+  for (const line of md.split(/\r?\n/)) {
+    const m = /^\|\s*(L\d+)\s*\|/.exec(line.trim());
+    if (m) set.add(m[1]);
+  }
+  return set;
+}
+
+/** Compare JSON L-numbers against the md set, both directions. */
+export function checkSync(jsonMap, mdSet) {
+  const jsonSet = new Set();
+  for (const [node, chains] of Object.entries(jsonMap)) {
+    if (node === '_note') continue;
+    if (Array.isArray(chains)) for (const c of chains) jsonSet.add(c);
+  }
+  const jsonOnly = [...jsonSet].filter((c) => !mdSet.has(c)); // ссылки на несуществующие L
+  const mdOnly = [...mdSet].filter((c) => !jsonSet.has(c)); // потерянные цепочки
+  return { ok: jsonOnly.length === 0 && mdOnly.length === 0, jsonOnly, mdOnly };
+}
+
+/** CLI entry — exit 1 on drift with a human-readable message. */
+function main() {
+  const md = readFileSync(MD_PATH, 'utf8');
+  const jsonMap = JSON.parse(readFileSync(JSON_PATH, 'utf8'));
+  const mdSet = parseChainsFromMd(md);
+  if (mdSet.size === 0) {
+    console.error(
+      '[chain-map-checker] не нашёл ни одной L-строки в routing-off-phase.md — формат таблицы изменился?'
+    );
+    process.exit(1);
+  }
+  const res = checkSync(jsonMap, mdSet);
+  if (res.ok) {
+    console.log(`[chain-map-checker] OK — ${mdSet.size} chains in sync`);
+    process.exit(0);
+  }
+  console.error('[chain-map-checker] дрейф маппинга chain-map <-> routing-off-phase.md:');
+  if (res.jsonOnly.length)
+    console.error(`  JSON ссылается на отсутствующие в .md цепочки: ${res.jsonOnly.join(', ')}`);
+  if (res.mdOnly.length)
+    console.error(
+      `  В .md есть цепочки без записи в JSON: ${res.mdOnly.join(', ')} — добавьте узлы в tools/observer-chain-map.json`
+    );
+  process.exit(1);
+}
+
+if (process.argv[1]?.endsWith('observer-chain-map-checker.mjs')) {
+  main();
+}
diff --git a/tools/observer-chain-map-checker.test.mjs b/tools/observer-chain-map-checker.test.mjs
new file mode 100644
index 00000000..da442766
--- /dev/null
+++ b/tools/observer-chain-map-checker.test.mjs
@@ -0,0 +1,46 @@
+import { describe, it, expect } from 'vitest';
+import { parseChainsFromMd, checkSync } from './observer-chain-map-checker.mjs';
+
+const SAMPLE_MD = [
+  '| # | Цепочка | Зачем |',
+  '|---|---|---|',
+  '| L1 | `discovery-interview` (FEATURE) → `brainstorming` | text |',
+  '| L2 | `audit-portal` | text |',
+  '| L13 | `billing-audit` (#62) + `Pest` | text |',
+].join('\n');
+
+describe('parseChainsFromMd', () => {
+  it('extracts the set of L-numbers from the table', () => {
+    expect(parseChainsFromMd(SAMPLE_MD)).toEqual(new Set(['L1', 'L2', 'L13']));
+  });
+});
+
+describe('checkSync', () => {
+  it('passes when JSON L-numbers subset of md and md subset of json-union', () => {
+    const mdSet = new Set(['L1', 'L2', 'L13']);
+    const jsonMap = { a: ['L1'], b: ['L2'], c: ['L13'] };
+    expect(checkSync(jsonMap, mdSet).ok).toBe(true);
+  });
+
+  it('fails when JSON references a chain absent from md', () => {
+    const mdSet = new Set(['L1', 'L2']);
+    const jsonMap = { a: ['L1'], b: ['L99'] };
+    const res = checkSync(jsonMap, mdSet);
+    expect(res.ok).toBe(false);
+    expect(res.jsonOnly).toContain('L99');
+  });
+
+  it('fails when md has a chain not covered by any JSON entry', () => {
+    const mdSet = new Set(['L1', 'L2', 'L14']);
+    const jsonMap = { a: ['L1'], b: ['L2'] };
+    const res = checkSync(jsonMap, mdSet);
+    expect(res.ok).toBe(false);
+    expect(res.mdOnly).toContain('L14');
+  });
+
+  it('ignores the _note metadata key in the JSON map', () => {
+    const mdSet = new Set(['L1']);
+    const jsonMap = { _note: 'meta', a: ['L1'] };
+    expect(checkSync(jsonMap, mdSet).ok).toBe(true);
+  });
+});
diff --git a/tools/observer-chain-map.json b/tools/observer-chain-map.json
new file mode 100644
index 00000000..e13a3acb
--- /dev/null
+++ b/tools/observer-chain-map.json
@@ -0,0 +1,41 @@
+{
+  "_note": "node_chosen -> L-цепочки. Только узлы, входящие хотя бы в одну L1-L13. Узлы вне цепочек (direct, прочее) НЕ включаются -> chainsFor вернёт null. Имена ключей = реальные значения primary_rationale.node_chosen (skill-id из skill_invoked). MCP/agent-узлы (laravel-boost, openapi-mcp-server, api-docs, sentry-mcp, redis-mcp, pest, github-mcp) в node_chosen не появляются, но включены для полноты покрытия цепочек L1-L13 (контролёр C6 требует, чтобы каждая L из routing-off-phase.md была покрыта). Синхронизируется с docs/routing-off-phase.md через tools/observer-chain-map-checker.mjs.",
+  "discovery-interview": ["L1", "L2"],
+  "superpowers:brainstorming": ["L1"],
+  "superpowers:writing-plans": ["L1"],
+  "superpowers:subagent-driven-development": ["L1"],
+  "audit-portal": ["L2"],
+  "process-analysis": ["L3"],
+  "process-modeling": ["L3", "L4"],
+  "mermaid": ["L4"],
+  "adr-kit:adr": ["L4", "L5"],
+  "adr-kit:judge": ["L5"],
+  "operations": ["L4"],
+  "architecture-patterns:architecture-patterns": ["L5"],
+  "deptrac": ["L5", "L14"],
+  "rector": ["L14"],
+  "php-insights": ["L14"],
+  "larastan": ["L14"],
+  "laravel-backend-patterns": ["L14"],
+  "security-review": ["L6"],
+  "openapi-mcp-server": ["L7"],
+  "api-docs": ["L7"],
+  "laravel-boost": ["L7", "L13"],
+  "superpowers:systematic-debugging": ["L8"],
+  "sentry-mcp": ["L8", "L13"],
+  "redis-mcp": ["L8", "L13"],
+  "ccpm": ["L9"],
+  "product-management:brainstorm": ["L9"],
+  "github-mcp": ["L9"],
+  "promptfoo": ["L10"],
+  "data-scientist": ["L10"],
+  "claude-api": ["L10"],
+  "skill-creator:skill-creator": ["L11"],
+  "hookify:hookify": ["L11"],
+  "plugin-dev:create-plugin": ["L11"],
+  "claude-md-management:claude-md-improver": ["L12"],
+  "claude-md-management:revise-claude-md": ["L12"],
+  "billing-audit": ["L13"],
+  "pest": ["L13"],
+  "ru-tax-accounting": ["L13"]
+}
diff --git a/tools/observer-retrofill-chain-ref.mjs b/tools/observer-retrofill-chain-ref.mjs
new file mode 100644
index 00000000..3d6df8d2
--- /dev/null
+++ b/tools/observer-retrofill-chain-ref.mjs
@@ -0,0 +1,58 @@
+#!/usr/bin/env node
+/**
+ * One-shot retrofill: add primary_rationale.chain_ref to existing v2 episodes
+ * in docs/observer/episodes-*.jsonl. Idempotent (skips lines that already have
+ * chain_ref), atomic per file (tmp + rename). Pure fs, no LLM.
+ *
+ * Usage: node tools/observer-retrofill-chain-ref.mjs [--dry-run]
+ */
+import { readFileSync, writeFileSync, renameSync, readdirSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+import { loadChainMap, chainsFor } from './observer-chain-detector.mjs';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const OBS_DIR = join(__dirname, '..', 'docs', 'observer');
+
+/** Add chain_ref to a single parsed episode object (pure). Idempotent. */
+export function retrofillLine(ep, map) {
+  if (!ep || ep.schema_version !== 2 || !ep.primary_rationale) return ep;
+  if ('chain_ref' in ep.primary_rationale) return ep; // idempotent
+  ep.primary_rationale.chain_ref = chainsFor(ep.primary_rationale.node_chosen, map);
+  return ep;
+}
+
+/** Process one JSONL file atomically (tmp + rename). Returns {changed, total}. */
+export function retrofillFile(path, map, { dryRun = false } = {}) {
+  const lines = readFileSync(path, 'utf8').split(/\r?\n/);
+  let changed = 0;
+  let total = 0;
+  const out = lines.map((line) => {
+    if (!line.trim()) return line;
+    total++;
+    const ep = JSON.parse(line);
+    const before = ep.primary_rationale && 'chain_ref' in ep.primary_rationale;
+    const next = retrofillLine(ep, map);
+    const after = next.primary_rationale && 'chain_ref' in next.primary_rationale;
+    if (!before && after) changed++;
+    return JSON.stringify(next);
+  });
+  if (!dryRun && changed > 0) {
+    const tmp = `${path}.tmp`;
+    writeFileSync(tmp, out.join('\n'), 'utf8');
+    renameSync(tmp, path);
+  }
+  return { changed, total };
+}
+
+function main() {
+  const dryRun = process.argv.includes('--dry-run');
+  const map = loadChainMap();
+  const files = readdirSync(OBS_DIR).filter((f) => /^episodes-\d{4}-\d{2}\.jsonl$/.test(f));
+  for (const f of files) {
+    const { changed, total } = retrofillFile(join(OBS_DIR, f), map, { dryRun });
+    console.log(`${dryRun ? '[dry-run] ' : ''}${f}: ${changed}/${total} lines get chain_ref`);
+  }
+}
+
+if (process.argv[1]?.endsWith('observer-retrofill-chain-ref.mjs')) main();
diff --git a/tools/observer-retrofill-chain-ref.test.mjs b/tools/observer-retrofill-chain-ref.test.mjs
new file mode 100644
index 00000000..9ba74107
--- /dev/null
+++ b/tools/observer-retrofill-chain-ref.test.mjs
@@ -0,0 +1,28 @@
+import { describe, it, expect } from 'vitest';
+import { retrofillLine } from './observer-retrofill-chain-ref.mjs';
+import { loadChainMap } from './observer-chain-detector.mjs';
+
+const map = loadChainMap();
+
+describe('retrofillLine', () => {
+  it('adds chain_ref to a v2 episode with a known node', () => {
+    const ep = { schema_version: 2, primary_rationale: { node_chosen: 'billing-audit' } };
+    const out = retrofillLine(ep, map);
+    expect(out.primary_rationale.chain_ref).toEqual(['L13']);
+  });
+
+  it('sets chain_ref null for a direct v2 episode', () => {
+    const ep = { schema_version: 2, primary_rationale: { node_chosen: 'direct' } };
+    expect(retrofillLine(ep, map).primary_rationale.chain_ref).toBeNull();
+  });
+
+  it('is idempotent — does not overwrite existing chain_ref', () => {
+    const ep = { schema_version: 2, primary_rationale: { node_chosen: 'direct', chain_ref: ['L1'] } };
+    expect(retrofillLine(ep, map).primary_rationale.chain_ref).toEqual(['L1']);
+  });
+
+  it('skips v1 episodes (no schema_version 2)', () => {
+    const ep = { foo: 'bar' };
+    expect(retrofillLine(ep, map)).toEqual({ foo: 'bar' });
+  });
+});
diff --git a/tools/observer-transcript-parser.mjs b/tools/observer-transcript-parser.mjs
index 748f3b03..e50113ad 100644
--- a/tools/observer-transcript-parser.mjs
+++ b/tools/observer-transcript-parser.mjs
@@ -16,6 +16,14 @@
  */
 
 import { detectChoiceProvenance, detectAskUserQuestionChoice } from './observer-choice-detector.mjs';
+import { loadChainMap, chainsFor } from './observer-chain-detector.mjs';
+
+let CHAIN_MAP = null;
+try {
+  CHAIN_MAP = loadChainMap();
+} catch {
+  CHAIN_MAP = new Map(); // битый/отсутствующий JSON -> chainsFor вернёт null, observer не падает
+}
 
 const SUPERPOWERS_PREFIX = 'superpowers:';
 
@@ -694,6 +702,7 @@ export function parseTranscript(transcriptText, fallbackSessionId = null) {
       return {
         step: 1,
         node_chosen: skills.length > 0 ? skills[0] : 'direct',
+        chain_ref: chainsFor(skills.length > 0 ? skills[0] : 'direct', CHAIN_MAP),
         triggers_matched: merge(extractTriggers(turn), tag ? tag.triggers : []),
         candidates_considered: merge(extractCandidates(turn), tag ? tag.candidates : []),
         boundaries_applied: merge(extractBoundaries(turn), tag ? tag.boundaries : []),
diff --git a/tools/observer-transcript-parser.test.mjs b/tools/observer-transcript-parser.test.mjs
index a7df1560..09ac10e1 100644
--- a/tools/observer-transcript-parser.test.mjs
+++ b/tools/observer-transcript-parser.test.mjs
@@ -106,6 +106,25 @@ describe('parseTranscript', () => {
     expect(parseTranscript(t).primary_rationale.node_chosen).toBe('direct');
   });
 
+  it('attaches chain_ref for a node that belongs to a chain', () => {
+    const t = jsonl([
+      userPrompt('go', '2026-05-19T10:00:00Z'),
+      assistantTurn(
+        [{ type: 'tool_use', id: 't1', name: 'Skill', input: { skill: 'billing-audit' } }],
+        '2026-05-19T10:01:00Z'
+      ),
+    ]);
+    expect(parseTranscript(t).primary_rationale.chain_ref).toEqual(['L13']);
+  });
+
+  it('sets chain_ref null for a direct episode', () => {
+    const t = jsonl([
+      userPrompt('go', '2026-05-19T10:00:00Z'),
+      assistantTurn([{ type: 'tool_use', id: 't1', name: 'Read', input: {} }], '2026-05-19T10:01:00Z'),
+    ]);
+    expect(parseTranscript(t).primary_rationale.chain_ref).toBeNull();
+  });
+
   it('hard_floor invoked when a superpowers skill is used', () => {
     const t = jsonl([
       userPrompt('go', '2026-05-19T10:00:00Z'),
diff --git a/tools/status-md-generator.mjs b/tools/status-md-generator.mjs
index 86ea9bfe..b5feafed 100644
--- a/tools/status-md-generator.mjs
+++ b/tools/status-md-generator.mjs
@@ -10,6 +10,7 @@ function iconFor(status) {
 
 export function renderStatus(inputs) {
   const { now, c1, c2, c3, c5, observer, lastRetroDaysAgo } = inputs;
+  const c6 = inputs.c6 || { status: 'ok', detail: '—' };
   const retroLine = (lastRetroDaysAgo === null || lastRetroDaysAgo === undefined)
     ? 'never'
     : `${lastRetroDaysAgo} day(s) ago`;
@@ -24,6 +25,7 @@ Last updated: ${now}
 | C3 Observer-of-observer | ${iconFor(c3.status)} | ${c3.detail || '—'} |
 | C4 Сигнальный статус | ✅ | This file (self-reference) |
 | C5 Observer-coverage | ${iconFor(c5.status)} | ${c5.detail || '—'} |
+| C6 Chain map sync | ${iconFor(c6.status)} | ${c6.detail || '—'} |
 
 ## Метрики (информационные, не алерты)
 
@@ -114,6 +116,7 @@ if (process.argv[1] && process.argv[1].replace(/\\/g, '/').endsWith('/status-md-
       status: c5ok ? 'ok' : 'warn',
       detail: [cov.coverage.detail, cov.registration.detail].join(' · '),
     },
+    c6: runControllerNode(['tools/observer-chain-map-checker.mjs']),
     observer: {
       episodeCount: countEpisodes(),
       observerErrors: countObserverErrors(),
diff --git a/tools/status-md-generator.test.mjs b/tools/status-md-generator.test.mjs
index c4c861db..daefdf5e 100644
--- a/tools/status-md-generator.test.mjs
+++ b/tools/status-md-generator.test.mjs
@@ -7,6 +7,7 @@ const baseInputs = (overrides = {}) => ({
   c2: { status: 'ok', detail: '0 version drift' },
   c3: { status: 'ok', detail: 'last read today' },
   c5: { status: 'ok', detail: 'coverage OK · registration OK' },
+  c6: { status: 'ok', detail: '14 chains in sync' },
   observer: { episodeCount: 12, observerErrors: 0, piiMatches: 0 },
   ...overrides,
 });
@@ -23,6 +24,11 @@ describe('renderStatus', () => {
     expect(md).toContain('12 episodes');
   });
 
+  it('includes a C6 chain-map row', () => {
+    const md = renderStatus(baseInputs());
+    expect(md).toContain('| C6 Chain map sync | ✅');
+  });
+
   it('shows a warn status for the coverage controller', () => {
     const md = renderStatus(baseInputs({ c5: { status: 'warn', detail: '3 commits, 0 episodes' } }));
     expect(md).toContain('| C5 Observer-coverage | ⚠️');