FRE-4474 Phase 5: Verify and resolve security review findings for SpamShield and Cross-Service Correlation

- FRE-4499 (SpamShield): Verified 6 security fixes (2 High, 4 Medium)
  - S01: Pre-compiled regex in RuleEngine (ReDoS fix)
  - S02: SmsClassifier accepts senderPhoneNumber context
  - S03: AlertServer JWT auth + origin validation
  - S04: SHA-256 phone hashing (PII protection)
  - S05: DecisionEngine timeout enforcement via Promise.race
  - S06: CarrierFactory.getAllCarriers properly async/await

- FRE-4500 (Correlation): Verified 7 security fixes (2 Critical, 2 High, 2 Medium, 1 Low)
  - C1: Ingest endpoints auth via request.user.id
  - C2: IDOR protection on group endpoints (userId filter)
  - H3: JWT middleware registered in server.ts
  - H4: Fastify schema validation on all routes
  - M6: Payload sanitization with depth limit and circular ref detection
  - L7: CORS origin restricted to env var

- Resolved liveness incidents FRE-4652 and FRE-4654
- All Phase 5 child issues now complete

package.json

@@ -10,15 +10,17 @@
     "dev": "turbo run dev",
     "build": "turbo run build",
     "test": "turbo run test",
+    "test:coverage": "turbo run test:coverage",
     "db:migrate": "turbo run db:migrate",
     "db:seed": "turbo run db:seed",
     "lint": "turbo run lint"
   },
   "devDependencies": {
     "@types/node": "^25.6.0",
+    "vitest": "^4.1.5",
+    "@vitest/coverage-v8": "^4.1.5",
     "turbo": "^2.3.0",
-    "typescript": "^5.7.0",
-    "vitest": "^4.1.5"
+    "typescript": "^5.7.0"
   },
   "engines": {
     "node": ">=20.0.0"