feat: Add comprehensive Jest test suite (209 tests)

- Add Jest configuration for TypeScript testing
- Add security utilities tests (44 tests)
- Add Zod validation tests (34 tests)
- Add cursor pagination tests (25 tests)
- Add query builder tests (38 tests)
- Add tools structure validation (68 tests)
- All 164 tools validated for correct structure
- Version bump to 1.3.4

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,38 @@
 
 All notable changes to this project will be documented in this file.
 
+## [1.3.4] - 2026-01-31
+
+### Added
+
+- **Test Suite:** Comprehensive Jest test infrastructure with 209 tests
+  - `jest.config.js`: Jest configuration for TypeScript
+  - `src/utils/__tests__/security.test.ts`: Security utilities tests (44 tests)
+  - `src/utils/__tests__/validation.test.ts`: Zod validation tests (34 tests)
+  - `src/utils/__tests__/pagination.test.ts`: Cursor pagination tests (25 tests)
+  - `src/utils/__tests__/query-builder.test.ts`: Query builder tests (38 tests)
+  - `src/tools/__tests__/tools-structure.test.ts`: Tools structure validation (68 tests)
+
+### Tested
+
+- **Utilities Coverage:**
+  - UUID, email, URL validation
+  - Rate limiting behaviour
+  - HTML escaping and sanitization
+  - Pagination defaults and limits
+  - Cursor encoding/decoding
+  - SQL query building
+
+- **Tools Structure:**
+  - All 164 tools validated for correct structure
+  - Input schemas have required properties defined
+  - Unique tool names across all modules
+  - Handlers are functions
+
+### Dependencies
+
+- Added `ts-jest` for TypeScript test support
+
 ## [1.3.3] - 2026-01-31
 
 ### Fixed