test(classifier): regression guards for 8-pattern PAMYATKA (Phase 3 close)

Three regression tests:
1. Header count reflects 8 patterns
2. All 8 patterns present in strict ascending order (1-8)
3. Original 4 patterns (brainstorming/discovery/plans/debugging) preserved
   verbatim — protects existing accuracy baseline from drift on future
   pamyatka edits.

Closes Phase 3 brain-retro #9 candidates 7/1/8/10.

docs/observer/STATUS.md

@@ -1,6 +1,6 @@
 # Brain Status (auto-generated)
 
-Last updated: 2026-05-28T09:10:54.147Z
+Last updated: 2026-05-28T09:12:46.162Z
 
 | Контролёр | Состояние | Детали |
 |---|---|---|

tools/router-classifier.test.mjs

@@ -557,4 +557,26 @@ describe('PAMYATKA extensions (Phase 3 brain-retro #9)', () => {
     expect(system).toMatch(/coder-agent|#19|Task tool|субагент/);
     expect(system).toMatch(/однотипн|механич|N одинаковых|перенеси все/);
   });
+
+  it('PAMYATKA header reflects 8 patterns total', () => {
+    const { system } = buildClassifierPromptStructured('тест', registry, { enrichment: true });
+    expect(system).toMatch(/=== ПАМЯТКА \(8 паттернов\) ===/);
+  });
+
+  it('all 8 patterns present in correct order', () => {
+    const { system } = buildClassifierPromptStructured('тест', registry, { enrichment: true });
+    const indices = [1, 2, 3, 4, 5, 6, 7, 8].map(n => system.indexOf(`ПАТТЕРН ${n}`));
+    indices.forEach((idx, i) => expect(idx, `ПАТТЕРН ${i + 1} missing`).toBeGreaterThan(-1));
+    for (let i = 1; i < indices.length; i++) {
+      expect(indices[i]).toBeGreaterThan(indices[i - 1]);
+    }
+  });
+
+  it('original 4 patterns (brainstorming, discovery, plans, debugging) preserved verbatim', () => {
+    const { system } = buildClassifierPromptStructured('тест', registry, { enrichment: true });
+    expect(system).toContain('минимум 3 alternative_considered');
+    expect(system).toContain('discovery-interview');
+    expect(system).toMatch(/single-step.*multi-step|multi-step.*single-step/);
+    expect(system).toContain('system/expected/actual');
+  });
 });