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

services/spamshield/package.json

@@ -8,6 +8,7 @@
     "dev": "tsx watch src/index.ts",
     "lint": "eslint src/",
     "test": "vitest run",
+    "test:coverage": "vitest run --coverage",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
@@ -22,6 +23,8 @@
     "typescript": "^5.3.3",
     "tsx": "^4.19.0",
     "eslint": "^8.56.0",
-    "@types/ws": "^8.5.10"
+    "@types/ws": "^8.5.10",
+    "vitest": "^4.1.5",
+    "@vitest/coverage-v8": "^4.1.5"
   }
 }