ci: add coverage reporting via Codecov

Configures Jest to output lcov coverage, uploads to Codecov in CI,
and adds coverage badge to README.

Author: prih

.github/workflows/ci.yml

@@ -24,4 +24,10 @@ jobs:
         run: npm run build:server
 
       - name: Run tests
-        run: npm test
+        run: npm test -- --coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: coverage/lcov.info

README.md

@@ -1,5 +1,10 @@
 # graphmemory
 
+[![npm](https://img.shields.io/npm/v/@graphmemory/server)](https://www.npmjs.com/package/@graphmemory/server)
+[![CI](https://github.com/graph-memory/graphmemory/actions/workflows/ci.yml/badge.svg)](https://github.com/graph-memory/graphmemory/actions/workflows/ci.yml)
+[![License: ELv2](https://img.shields.io/badge/license-ELv2-blue)](LICENSE)
+[![codecov](https://codecov.io/gh/graph-memory/graphmemory/graph/badge.svg)](https://codecov.io/gh/graph-memory/graphmemory)
+
 An MCP server that builds a **semantic graph memory** from a project directory.
 Indexes markdown docs, TypeScript/JavaScript source code, and all project files into six graph structures,
 then exposes them as **58 MCP tools** + **REST API** + **Web UI**.
@@ -155,7 +160,7 @@ See [docs/authentication.md](docs/authentication.md).
 ```bash
 npm run dev              # tsc --watch (backend)
 cd ui && npm run dev     # Vite on :5173, proxies /api → :3000
-npm test                 # 1240 tests across 28 suites
+npm test                 # 1619 tests across 42 suites
 ```
 
 ## Documentation

jest.config.ts

@@ -15,6 +15,8 @@ const config: Config = {
     '^mime$': '<rootDir>/src/tests/__mocks__/mime.ts',
   },
   watchman: false,
+  coverageDirectory: 'coverage',
+  coverageReporters: ['lcov', 'text-summary'],
 };
 
 export default config;