feat(tests): enhance MCPClient tests with additional scenarios and validations

- Added tests for backward compatibility with string URLs and serverUrl alias in MCPClient.
- Included tests for request method, error handling, and retry logic in MCPClient.
- Expanded fetch functions tests (fetchCalendarEvents, fetchCommitteeReports, fetchPropositions, etc.) to cover optional parameters and response validation.
- Introduced tests for new utility functions: generate-news-indexes and generate-sitemap, ensuring proper functionality and XML validation.
- Removed outdated verify_implementation.sh script.
- Updated vitest.config.js to exclude non-testable scripts from coverage.

Author: pethers

a604895cbc064ce0832b4b4a362e5c9a.txt

@@ -23,6 +23,7 @@
     "generate-news": "node scripts/generate-news-enhanced.js",
     "generate-news-indexes": "node scripts/generate-news-indexes.js",
     "generate-sitemap": "node scripts/generate-sitemap.js",
+    "generate-news-backport": "node scripts/generate-news-backport.js",
     "htmlhint": "sh -c 'htmlhint *.html; set -- news/*.html; if [ -e \"$1\" ]; then htmlhint \"$@\"; else echo \"No news/*.html files to lint\"; fi'",
     "serve": "python3 -m http.server 8080",
     "linkcheck": "linkinator http://localhost:8080/ --recurse"