docs: Add integration tests to test coverage statistics

Updated implementation-gaps.md to include backend integration tests:

Backend Integration Tests (✅ PARTIALLY COMPLETED):
- 4 E2E test files (1,205 lines)
- 61 test cases (it() blocks)
- 21 test suites (describe() blocks)

Test Files:
1. auth.e2e-spec.ts (510 lines) - Registration, login, refresh, logout
2. tracking.e2e-spec.ts (354 lines) - Activity tracking endpoints
3. children.e2e-spec.ts (317 lines) - Child management endpoints
4. app.e2e-spec.ts (24 lines) - Health check

Total Test Coverage:
- 12 test files (8 unit + 4 integration)
- 4,068 lines of test code
- 197 test cases (136 unit + 61 integration)
- 78 test suites (57 unit + 21 integration)

Remaining: Integration tests needed for Families, AI, Compliance, Analytics,
Notifications, Photos, Voice, Feedback modules (8 more modules)

Updated "Recent Progress" and "Next Steps" to reflect comprehensive test foundation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/implementation-gaps.md

@@ -777,17 +777,25 @@ This document identifies features specified in the documentation that are not ye
    - **Remaining:** 19/26 services still need tests (MFA, biometric, sessions, devices, password reset, email verification, analytics, notifications, photo, voice, feedback, etc.)
    - **Target:** 80% code coverage
 
-#### Remaining Features
-
-2. **Integration Tests**
-   - Status: Not implemented
-   - Current: No API testing
-   - Needed: Supertest-based endpoint testing
+2. **Backend Integration Tests (E2E)** ✅ PARTIALLY COMPLETED
+   - Status: **4 test files implemented** (1,205 lines)
+   - Current: Supertest-based API endpoint testing for core modules
+   - Implemented:
+     * auth.e2e-spec.ts (510 lines) - Registration, login, refresh, logout
+     * tracking.e2e-spec.ts (354 lines) - Activity tracking endpoints
+     * children.e2e-spec.ts (317 lines) - Child management endpoints
+     * app.e2e-spec.ts (24 lines) - Health check
+   - Test Statistics:
+     * **61 test cases** (it() blocks)
+     * **21 test suites** (describe() blocks)
    - Priority: High
    - Impact: API reliability
+   - **Remaining:** Need integration tests for Families, AI, Compliance, Analytics, Notifications, Photos, Voice, Feedback modules
 
-3. **E2E Tests**
-   - Status: Playwright installed (frontend) but no tests
+#### Remaining Features
+
+3. **Frontend E2E Tests**
+   - Status: Playwright installed but no tests
    - Current: No end-to-end testing
    - Needed: Critical user journey tests
    - Priority: Medium
@@ -1318,12 +1326,13 @@ This document identifies features specified in the documentation that are not ye
    - **Redux Persist** (October 2): Full state persistence with localStorage, PersistGate integration
    - **Security Settings UI** (October 2): 1,748 lines - MFA, biometric auth, sessions, devices, data export, account deletion (6 components)
    - **Backend Unit Tests** (October 2): 2,863 lines - 7/26 services tested (27% coverage), 136 test cases, 57 test suites
+   - **Backend Integration Tests** (October 2): 1,205 lines - 4 modules tested (auth, tracking, children, app), 61 test cases, 21 test suites
 
 3. **Missing Critical Features**: Testing infrastructure needs expansion (currently 27% backend service coverage, target 80% with integration/E2E tests).
 
 4. **AI Implementation**: ✅ Core AI features complete (safety, rate limiting, prompt protection). Still needs context management and multi-language support.
 
-5. **Testing Progress**: 27% backend service coverage achieved (2,863 lines, 136 tests). Need to complete remaining 19 services and add integration/E2E tests.
+5. **Testing Progress**: Strong foundation with 4,068 lines of tests (unit + integration), 197 test cases total. Backend: 27% service coverage (7/26), 4 integration test modules. Need: 19 more service tests + 8 more integration modules.
 
 6. **Accessibility Gaps**: No evidence of accessibility testing or screen reader support.
 
@@ -1334,7 +1343,7 @@ This document identifies features specified in the documentation that are not ye
 1. ~~**Implement compliance features**~~ - ✅ COMPLETED (COPPA/GDPR data export/deletion, consent management, age verification)
 2. ~~**Configure Redux Persist**~~ - ✅ COMPLETED (State persists with localStorage, PersistGate integration)
 3. ~~**Frontend UI for auth/compliance features**~~ - ✅ COMPLETED (MFA, biometric, sessions, devices, data export, account deletion - 1,748 lines)
-4. **Expand test coverage** - Currently 27% backend service coverage (7/26 services, 136 tests, 2,863 lines). Need: 19 more services, integration tests, E2E tests, CI/CD. Target: 80% coverage
+4. **Expand test coverage** - Currently 4,068 lines of tests (197 test cases: 136 unit + 61 integration). Backend: 27% service coverage (7/26). Need: 19 more service tests (high-priority: MFA, biometric, sessions, devices, password reset), frontend E2E tests, CI/CD integration. Target: 80% coverage
 5. **Add accessibility features** - Legal requirement and good practice (WCAG AA compliance, screen readers, keyboard nav)
 
 ### Documentation Quality