docs: add comprehensive test cleanup documentation

- Document removal of manual browser debugging scripts
- Outline new automated E2E test structure
- Provide migration guide from manual to automated tests
- Include running instructions for all test types
- Add benefits of new testing approach

tests/README-CLEANUP.md

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+# 🧹 Test Structure Cleanup
+
+## Changes Made
+
+### ❌ Removed Files
+
+- `manual/admin-login-debug.js` → Replaced by `e2e/auth-debug.spec.ts`
+- `manual/auth-db-debug.js` → Replaced by automated E2E tests
+- `manual/debug-email-validation.js` → Integrated into auth E2E tests
+
+### ✅ Optimizations
+
+- Consolidated mock files with index.js
+- Created shared test utilities in `e2e/test-utils.ts`
+- Added integration test runner script
+- Removed duplicate test patterns
+
+### 📁 Current Structure
+
+```
+tests/
+├── __mocks__/                  # Consolidated mocks
+│   ├── index.js               # ✨ New: Mock aggregator
+│   ├── node-fetch.js          # HTTP mocking
+│   └── uuid.js                # UUID mocking
+├── integration/               # Service integration tests
+│   ├── production.test.js     # Production readiness
+│   └── run-integration.sh     # ✨ New: Test runner
+├── e2e/                       # End-to-end tests
+│   ├── auth-debug.spec.ts     # ✨ New: Replaces manual auth tests
+│   ├── test-utils.ts          # ✨ New: Shared utilities
+│   ├── auth.spec.ts           # Authentication flows
+│   ├── medication.spec.ts     # Medication management
+│   ├── admin.spec.ts          # Admin interface
+│   ├── ui-navigation.spec.ts  # UI and navigation
+│   ├── reminders.spec.ts      # Reminder system
+│   ├── fixtures.ts            # Test fixtures
+│   └── helpers.ts             # Test helpers
+└── setup.ts                   # Global test setup
+```
+
+## Running Tests After Cleanup
+
+### All Tests
+
+```bash
+make test-all
+```
+
+### Specific Test Types
+
+```bash
+# Unit tests
+make test
+
+# Integration tests
+./tests/integration/run-integration.sh
+
+# E2E tests
+make test-e2e
+```
+
+### Debugging
+
+Instead of manual browser scripts, use:
+
+```bash
+# Interactive E2E debugging
+make test-e2e-ui
+
+# Debug specific auth issues
+bunx playwright test auth-debug.spec.ts --debug
+```
+
+## Migration Guide
+
+### Manual Tests → E2E Tests
+
+| Old Manual Script           | New E2E Test         | Purpose                         |
+| --------------------------- | -------------------- | ------------------------------- |
+| `admin-login-debug.js`      | `auth-debug.spec.ts` | Admin authentication validation |
+| `auth-db-debug.js`          | `auth-debug.spec.ts` | Database auth testing           |
+| `debug-email-validation.js` | `auth-debug.spec.ts` | Email format validation         |
+
+### Benefits
+
+- ✅ Automated instead of manual
+- ✅ Cross-browser testing
+- ✅ CI/CD integration
+- ✅ Better error reporting
+- ✅ Reproducible results