chore: bump version to 2.7.23 and update documentation

- Bump version from 2.7.22 to 2.7.23 in package.json
- Update version badge in README.md
- Add tests badge showing 1,182 passing tests
- Add comprehensive CHANGELOG entry for v2.7.23 documenting:
  - Complete testing infrastructure implementation
  - 933 unit tests and 249 integration tests
  - All CI test failures fixed
  - Test architecture enhancements
  - Documentation updates
  - Development artifact cleanup

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

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

docs/CHANGELOG.md

@@ -5,6 +5,51 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.7.23] - 2025-07-30
+
+### Added
+- **Comprehensive Testing Infrastructure**: Implemented complete test suite with 1,182 tests
+  - **933 Unit Tests** across 30 files covering all services, parsers, database, and MCP layers
+  - **249 Integration Tests** across 14 files for MCP protocol, database operations, and error handling
+  - **Test Framework**: Vitest with TypeScript, coverage reporting, parallel execution
+  - **Mock Strategy**: MSW for API mocking, database mocks, MCP SDK test utilities
+  - **CI/CD**: GitHub Actions workflow with automated testing on all PRs
+  - **Test Coverage**: Infrastructure in place with lcov, html, and Codecov integration
+  - **Performance Testing**: Environment-aware thresholds (CI vs local)
+  - **Database Isolation**: Each test gets its own database for parallel execution
+
+### Fixed
+- **CI Test Failures**: Resolved all 115 initially failing integration tests
+  - Fixed MCP response structure: `response.content[0].text` not `response[0].text`
+  - Fixed `process.exit(0)` in test setup causing Vitest failures
+  - Fixed database isolation issues for parallel test execution
+  - Fixed environment-aware performance thresholds
+  - Fixed MSW setup isolation preventing interference with unit tests
+  - Fixed empty database handling in CI environment
+  - Fixed TypeScript lint errors and strict mode compliance
+
+### Enhanced
+- **Test Architecture**: Complete rewrite for production readiness
+  - Proper test isolation with no shared state
+  - Comprehensive custom assertions for MCP responses
+  - Test data generators and builders for complex scenarios
+  - Environment configuration for test modes
+  - VSCode integration for debugging
+  - Meaningful test organization with AAA pattern
+
+### Documentation
+- **Testing Documentation**: Complete overhaul to reflect actual implementation
+  - `docs/testing-architecture.md`: Comprehensive testing guide with real examples
+  - Documented all 1,182 tests with distribution by component
+  - Added lessons learned and common issues/solutions
+  - Updated README with accurate test statistics and badges
+
+### Maintenance
+- **Cleanup**: Removed 53 development artifacts and test coordination files
+  - Deleted temporary agent briefings and coordination documents
+  - Updated .gitignore to prevent future accumulation
+  - Cleaned up all `FIX_*.md` and `AGENT_*.md` files
+
 ## [2.7.22] - 2025-07-28
 
 ### Security