docs(readme): add GitHub Node CI badge

[Copilot]

This PR addresses the README gap by adding a visible GitHub Node CI status badge, aligned with the requested pattern from the referenced repository.

• README updates

  • Added a Node CI badge directly under the project title in README.md.
  • Badge points to the existing workflow file (.github/workflows/ci.yml) for both status image and click-through details.

• Badge snippet

  [![Node CI](https://github.com/ioncache/git-diff-stat-extended/actions/workflows/ci.yml/badge.svg)](https://github.com/ioncache/git-diff-stat-extended/actions/workflows/ci.yml)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• collector.github.com
  • Triggering command: /home/REDACTED/.cache/ms-playwright/chromium_headless_shell-1181/chrome-linux/headless_shell /home/REDACTED/.cache/ms-playwright/chromium_headless_shell-1181/chrome-linux/headless_shell --disable-field-trial-config --disable-REDACTED-networking --disable-REDACTED-timer-throttling --disable-REDACTEDing-occluded-windows --disable-back-forward-cache --disable-breakpad --disable-client-side-phishing-detection --disable-component-extensions-with-REDACTED-pages --disable-component-update --no-default-browser-check --disable-default-apps --disable-dev-shm-usage --disable-extensions --disable-features=AcceptCHFrame,AutoExpandDetailsElement,AvoidUnnecessaryBeforeUnloadCheckSync,CertificateTransparencyComponentUpdater,DestroyProfileOnBrowserClose,DialMediaRouteProvider,ExtensionManifestV2Disabled,GlobalMediaControls,HttpsUpgrades,Impro extended/git-diff-stat-extended/node_modules/.bin/git --get color.ui ndor/bin/git git (dns block)
• https://api.github.com/_private/browser/stats
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US@posix --service-sandbox-type=none --no-sandbox --disable-dev-shm-usage --use-angle=swiftshader-webgl --use-gl=angle --mute-audio --headless=old --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,13749827412885025617,2318744747081917231,262144 --disable-features=AcceptCHFrame,AutoDeElevate,AutoExpandDetailsElement,AvoidUnnecessaryBeforeUnloadCheckSync,CertificateTransparencyComponentUpdater,DestroyProfileOnBrowserClose,DialMediaRouteProvider,ExtensionManifestV2Disabled,GlobalMediaControls,Https git bin/git --get color.ui lib/node-gyp-bin-t ages (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)