diff --git a/docs/superpowers/plans/2026-05-19-brain-governance.md b/docs/superpowers/plans/2026-05-19-brain-governance.md
index 8cb5cac1..60467046 100644
--- a/docs/superpowers/plans/2026-05-19-brain-governance.md
+++ b/docs/superpowers/plans/2026-05-19-brain-governance.md
@@ -152,6 +152,8 @@ Canonical chains L1–L12 in [`docs/routing-off-phase.md`](../routing-off-phase.
 
 A passive Stop-event hook appends one JSONL line per session to `docs/observer/episodes-YYYY-MM.jsonl` and optionally a MD note in `docs/observer/notes/`. **Observer only writes; never intervenes.** PII-filter (gitleaks-like regex) is mandatory pre-write.
 
+**Each episode has 5 mandatory fields** including a structured `primary_rationale` (7 sub-fields per spec §5.2.1: `step` / `node_chosen` / `triggers_matched` / `candidates_considered` / `boundaries_applied` / `hard_floor` / `task_classification`). Each individual router decision is also recorded as a `routing_decision` event in `events[]` (one per node-choice for chains). This enables **factor analysis** through `/brain-retro` — answers «which factors most often resolve conflicts between nodes X and Y» rather than just «node X used N times».
+
 A `/brain-retro` skill aggregates evidence once per sprint and proposes regulatory candidates; the owner accepts or rejects manually.
 
 ### 3. 4 mechanical controllers (first wave)
@@ -878,6 +880,17 @@ afterEach(() => {
   rmSync(workdir, { recursive: true, force: true });
 });
 
+// Helper for v1.1 — primary_rationale fixture (factor analysis amendment)
+const defaultRat = () => ({
+  step: 1,
+  node_chosen: '#1',
+  triggers_matched: [],
+  candidates_considered: [],
+  boundaries_applied: [],
+  hard_floor: { invoked: false, rules: [] },
+  task_classification: 'other',
+});
+
 describe('appendEpisode', () => {
   it('appends one JSONL line to monthly file', () => {
     const ep = {
@@ -885,29 +898,32 @@ describe('appendEpisode', () => {
       timestamps: { started_at: '2026-05-19T10:00:00+03:00', ended_at: '2026-05-19T10:05:00+03:00' },
       path_type: 'regulated',
       outcome: 'success',
+      primary_rationale: defaultRat(),
     };
     appendEpisode(ep, workdir, '2026-05');
     const file = join(workdir, 'docs', 'observer', 'episodes-2026-05.jsonl');
     const content = readFileSync(file, 'utf-8');
     expect(content).toContain('"task_id":"abc-123"');
+    expect(content).toContain('"primary_rationale"');
     expect(content.endsWith('\n')).toBe(true);
   });
 
   it('appends to existing file without overwrite', () => {
-    appendEpisode({ task_id: 'a', timestamps: {}, path_type: 'regulated', outcome: 'success' }, workdir, '2026-05');
-    appendEpisode({ task_id: 'b', timestamps: {}, path_type: 'improvised', outcome: 'partial' }, workdir, '2026-05');
+    appendEpisode({ task_id: 'a', timestamps: {}, path_type: 'regulated', outcome: 'success', primary_rationale: defaultRat() }, workdir, '2026-05');
+    appendEpisode({ task_id: 'b', timestamps: {}, path_type: 'improvised', outcome: 'partial', primary_rationale: defaultRat() }, workdir, '2026-05');
     const lines = readFileSync(join(workdir, 'docs', 'observer', 'episodes-2026-05.jsonl'), 'utf-8').trim().split('\n');
     expect(lines).toHaveLength(2);
     expect(JSON.parse(lines[0]).task_id).toBe('a');
     expect(JSON.parse(lines[1]).task_id).toBe('b');
   });
 
-  it('applies PII filter before write', () => {
+  it('applies PII filter before write (including events[])', () => {
     appendEpisode({
       task_id: 'c',
       timestamps: {},
       path_type: 'regulated',
       outcome: 'success',
+      primary_rationale: defaultRat(),
       events: [{ kind: 'error', message: 'call +79991234567 / mail x@y.com' }],
     }, workdir, '2026-05');
     const content = readFileSync(join(workdir, 'docs', 'observer', 'episodes-2026-05.jsonl'), 'utf-8');
@@ -916,14 +932,47 @@ describe('appendEpisode', () => {
     expect(content).not.toContain('79991234567');
   });
 
-  it('throws on missing required fields', () => {
+  it('throws on missing required top-level fields', () => {
     expect(() => appendEpisode({}, workdir, '2026-05')).toThrow(/required/i);
     expect(() => appendEpisode({ task_id: 'x' }, workdir, '2026-05')).toThrow(/required/i);
+    expect(() => appendEpisode({ task_id: 'x', timestamps: {}, path_type: 'regulated', outcome: 'success' }, workdir, '2026-05')).toThrow(/primary_rationale/i);
+  });
+
+  it('throws when primary_rationale field is missing', () => {
+    const ep = {
+      task_id: 'd',
+      timestamps: {},
+      path_type: 'regulated',
+      outcome: 'success',
+      primary_rationale: { step: 1, node_chosen: '#1' }, // missing other 5 fields
+    };
+    expect(() => appendEpisode(ep, workdir, '2026-05')).toThrow(/primary_rationale field missing/i);
+  });
+
+  it('persists routing_decision events with structured fields', () => {
+    appendEpisode({
+      task_id: 'e',
+      timestamps: {},
+      path_type: 'regulated',
+      outcome: 'success',
+      primary_rationale: defaultRat(),
+      events: [
+        { kind: 'routing_decision', step: 1, node_chosen: '#55', triggers_matched: ['discovery'],
+          candidates_considered: [{ node_id: '#53', dropped_because: 'ADR-009' }],
+          boundaries_applied: ['ADR-009'], hard_floor: { invoked: false, rules: [] },
+          task_classification: 'discovery' },
+      ],
+    }, workdir, '2026-05');
+    const line = JSON.parse(readFileSync(join(workdir, 'docs', 'observer', 'episodes-2026-05.jsonl'), 'utf-8').trim());
+    expect(line.events[0].kind).toBe('routing_decision');
+    expect(line.events[0].triggers_matched).toEqual(['discovery']);
+    expect(line.events[0].candidates_considered[0].dropped_because).toBe('ADR-009');
+    expect(line.events[0].boundaries_applied).toEqual(['ADR-009']);
   });
 });
 
 describe('buildEpisodeFromContext', () => {
-  it('extracts 4 mandatory fields from context object', () => {
+  it('extracts 5 mandatory fields from context object', () => {
     const ctx = {
       sessionId: 'sess-1',
       started: '2026-05-19T09:00:00+03:00',
@@ -935,6 +984,20 @@ describe('buildEpisodeFromContext', () => {
     expect(ep.timestamps.started_at).toBe(ctx.started);
     expect(ep.outcome).toBe('success');
     expect(['regulated', 'improvised', 'alternative', 'mixed']).toContain(ep.path_type);
+    expect(ep.primary_rationale).toBeDefined();
+    expect(ep.primary_rationale.step).toBe(1);
+    expect(ep.primary_rationale.hard_floor).toEqual({ invoked: false, rules: [] });
+  });
+
+  it('preserves user-provided primary_rationale unchanged', () => {
+    const rat = {
+      step: 1, node_chosen: '#55', triggers_matched: ['discovery'],
+      candidates_considered: [], boundaries_applied: ['ADR-009'],
+      hard_floor: { invoked: true, rules: ['Pravila §12'] },
+      task_classification: 'discovery',
+    };
+    const ep = buildEpisodeFromContext({ sessionId: 'x', primary_rationale: rat });
+    expect(ep.primary_rationale).toEqual(rat);
   });
 });
 ```
@@ -957,12 +1020,21 @@ import { appendFileSync, existsSync, mkdirSync } from 'fs';
 import { join } from 'path';
 import { sanitize } from './observer-pii-filter.mjs';
 
-const REQUIRED_FIELDS = ['task_id', 'timestamps', 'path_type', 'outcome'];
+const REQUIRED_FIELDS = ['task_id', 'timestamps', 'path_type', 'outcome', 'primary_rationale'];
+
+const RATIONALE_FIELDS = ['step', 'node_chosen', 'triggers_matched', 'candidates_considered', 'boundaries_applied', 'hard_floor', 'task_classification'];
+
+function validateRationale(rationale) {
+  for (const f of RATIONALE_FIELDS) {
+    if (rationale[f] === undefined) throw new Error(`primary_rationale field missing: ${f}`);
+  }
+}
 
 export function appendEpisode(episode, baseDir = process.cwd(), month = currentMonth()) {
   for (const f of REQUIRED_FIELDS) {
     if (episode[f] === undefined) throw new Error(`required field missing: ${f}`);
   }
+  validateRationale(episode.primary_rationale);
   const sanitized = sanitize(episode);
   const dir = join(baseDir, 'docs', 'observer');
   if (!existsSync(dir)) mkdirSync(dir, { recursive: true });
@@ -979,6 +1051,15 @@ export function buildEpisodeFromContext(ctx = {}) {
     },
     path_type: ctx.path_type || 'regulated',
     outcome: ctx.result || ctx.outcome || 'success',
+    primary_rationale: ctx.primary_rationale || {
+      step: 1,
+      node_chosen: ctx.node_chosen || ctx.skill_id || 'unknown',
+      triggers_matched: ctx.triggers_matched || [],
+      candidates_considered: ctx.candidates_considered || [],
+      boundaries_applied: ctx.boundaries_applied || [],
+      hard_floor: ctx.hard_floor || { invoked: false, rules: [] },
+      task_classification: ctx.task_classification || 'other',
+    },
     events: ctx.events || [],
   };
 }
@@ -1253,6 +1334,52 @@ YYYY-MM-DD .. YYYY-MM-DD ({N} sessions)
 | node | times used | first / last |
 |---|---|---|
 
+## Factor analysis matrix (v1.1+ — from `routing_decision` events + `primary_rationale`)
+
+Per-node breakdown by 5 factor axes (per spec §5.2.1).
+
+### Axis 1: triggers_matched → node
+
+«Какие триггеры чаще всего ведут к этому узлу»
+
+| node | trigger | count |
+|---|---|---|
+
+### Axis 2: candidates_considered.dropped_because → node
+
+«Какие альтернативы и почему отбрасываются в пользу этого узла»
+
+| node | dropped alternative | dropped_because (top reason) | count |
+|---|---|---|---|
+
+### Axis 3: boundaries_applied → node
+
+«Какие ADR / R-rules чаще всего разруливают в пользу этого узла»
+
+| node | boundary (ADR-NNN / PSR R-rule) | count |
+|---|---|---|
+
+### Axis 4: hard_floor.rules → invoked frequency
+
+«Как часто узел вынуждается hard-floor §12/§14/§15»
+
+| node | rule | invoked-count | total decisions | % forced |
+|---|---|---|---|---|
+
+### Axis 5: task_classification → node
+
+«В каких классах задач узел доминирует»
+
+| task_classification | top node | secondary nodes |
+|---|---|---|
+
+### Cross-tab: factor × factor
+
+Pairs of factors that co-occur to resolve specific conflicts (e.g. «ADR-009 ↔ triggers_matched=['discovery']» — 8 раз).
+
+| factor pair | combined count | interpretation |
+|---|---|---|
+
 ## Canonical chains L1–L12 hit rate
 
 | chain | times | notes |
@@ -2300,8 +2427,9 @@ git log origin/main --oneline | head -5
 |---|---|---|
 | §4 Router | A1, A2, A3 | ✅ |
 | §5 Observer scope B | B1, B2, B3, B5, B6 | ✅ |
+| §5.2.1 routing_decision + primary_rationale (v1.1 amendment) | B3 (validation + buildEpisodeFromContext extraction); ADR-011 Decision 2 (A1) | ✅ |
 | §5.4 PII filter | B2 | ✅ |
-| §5.5 /brain-retro | B6 | ✅ |
+| §5.5 /brain-retro (incl. factor matrix) | B6 (aggregation-template Factor analysis matrix) | ✅ |
 | §6.1 C1 L1-watcher | C1 + C5 | ✅ |
 | §6.2 C2 cross-ref | C2 + C5 | ✅ |
 | §6.3 C3 observer-of-observer 54 weeks | C3 + C5 | ✅ |