ci: Enable Codecov Test Analytics and update badge token

Add JUnit XML reporting to the test-coverage job and upload results
via codecov/test-results-action. This enables Test Analytics features
(test run times, failure rates, flaky test detection, and PR comments
with failed test summaries).

Also update the README Codecov badge URL to include the graph token,
following Codecov's new recommended badge format.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -136,7 +136,7 @@ jobs:
           node-version-file: .tool-versions
           cache: npm
       - run: npm ci
-      - run: npm run test-coverage -- --reporter=verbose
+      - run: npm run test-coverage -- --reporter=verbose --reporter=junit --outputFile.junit=./test-report.junit.xml
         env:
           CI_OS: ${{ runner.os }}
       - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
@@ -149,6 +149,12 @@ jobs:
           directory: ./coverage
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      - uses: codecov/test-results-action@0fa95f0e1eeaafde2c782583b36b28ad0d8c77d3 # v1.2.1
+        if: ${{ !cancelled() }}
+        with:
+          files: ./test-report.junit.xml
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   build-and-run:
     name: Build and run

.gitignore

@@ -20,6 +20,7 @@ website/server/.compile-cache/
 
 # Test coverage
 coverage/
+test-report.junit.xml
 
 # Temporary files
 *.tmp

README.md

@@ -40,7 +40,7 @@
 [![npm](https://img.shields.io/npm/v/repomix.svg?maxAge=1000)](https://www.npmjs.com/package/repomix)
 [![npm](https://img.shields.io/npm/d18m/repomix)](https://www.npmjs.com/package/repomix)
 [![Actions Status](https://github.com/yamadashy/repomix/actions/workflows/ci.yml/badge.svg)](https://github.com/yamadashy/repomix/actions?query=workflow%3A"ci")
-[![codecov](https://codecov.io/github/yamadashy/repomix/graph/badge.svg)](https://codecov.io/github/yamadashy/repomix)
+[![codecov](https://codecov.io/github/yamadashy/repomix/graph/badge.svg?token=PYQHD2SSHX)](https://codecov.io/github/yamadashy/repomix)
 [![Sponsors](https://img.shields.io/github/sponsors/yamadashy?logo=github)](https://github.com/sponsors/yamadashy)
 [![Discord](https://badgen.net/discord/online-members/wNYzTwZFku?icon=discord&label=discord)](https://discord.gg/wNYzTwZFku)