fix: replace static coverage badge with dynamic Codecov badge

- Removed hardcoded coverage badge linking to non-existent COVERAGE_SUMMARY.md

- Added dynamic Codecov badge that shows actual coverage percentage

- Badge now links to Codecov dashboard instead of local file

Author: cynarlab

README.md

@@ -7,7 +7,7 @@
 **MCP server for multi-language debugging – give your AI agents debugging superpowers** 🚀
 
 [![CI](https://github.com/debugmcp/mcp-debugger/actions/workflows/ci.yml/badge.svg)](https://github.com/debugmcp/mcp-debugger/actions/workflows/ci.yml)
-[![Coverage](https://img.shields.io/badge/coverage-90%25+-brightgreen.svg)](./COVERAGE_SUMMARY.md)
+[![codecov](https://codecov.io/gh/debugmcp/mcp-debugger/branch/main/graph/badge.svg)](https://codecov.io/gh/debugmcp/mcp-debugger)
 [![npm version](https://img.shields.io/npm/v/@debugmcp/mcp-debugger.svg)](https://www.npmjs.com/package/@debugmcp/mcp-debugger)
 [![Docker Pulls](https://img.shields.io/docker/pulls/debugmcp/mcp-debugger.svg)](https://hub.docker.com/r/debugmcp/mcp-debugger)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](./LICENSE)