Added a link checker for md files

.github/workflows/links.yml

@@ -0,0 +1,28 @@
+---
+name: Lychee link checker
+
+on:
+  workflow_dispatch:
+  schedule:
+    # Run weekly on Sundays at 3 AM UTC to catch broken links
+    - cron: '0 3 * * 0'
+
+permissions:
+  contents: read
+
+jobs:
+  link-checker:
+    name: Lychee link checker
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Link Checker
+        id: lychee
+        uses: lycheeverse/lychee-action@v2.8.0
+        with:
+          # Check all Markdown files in the repository
+          args: --config lychee.toml --verbose --no-progress --max-redirects 10 '**/*.md'
+          fail: true

.gitignore

@@ -1,6 +1,7 @@
 coverage
 node_modules
 .directory
+.github/copilot-instructions.md
 .idea
 dist/
 /venv/

lychee.toml

@@ -0,0 +1,39 @@
+# Lychee link checker configuration
+# This file configures how lychee validates links in the repository
+#
+# For more information about lychee configuration, see:
+# https://github.com/lycheeverse/lychee#configuration
+#
+# This configuration addresses false positive errors from the link checker:
+# - 403 Forbidden: Some sites (shields.io, qlty.sh) block automated requests
+#   but work fine in browsers
+# - 429 Too Many Requests: Rate limiting doesn't mean the link is broken
+
+# Accept these HTTP status codes as valid
+# 200: OK (standard success)
+# 204: No Content (valid response with no body)
+# 206: Partial Content (valid for range requests)
+# 403: Forbidden (some sites block automated requests but links work in browsers)
+# 429: Too Many Requests (rate limiting, link may be valid)
+accept = [200, 204, 206, 403, 429]
+
+# Timeout for requests (in seconds)
+timeout = 30
+
+# Maximum number of retries per link
+max_retries = 3
+
+# Maximum number of concurrent network requests
+max_concurrency = 8
+
+# User agent string to use for requests
+# Some sites require a browser-like user agent to avoid blocking
+user_agent = "Mozilla/5.0 (X11; Linux x86_64; rv:100.0) Gecko/20100101 Firefox/100.0"
+
+# Exclude URL patterns from link checking
+exclude = [
+    '^http://127\.0\.0\.',
+    '^http://localhost',
+    '^https://localhost',
+    '^file://',
+]