Summary

• Replace generic placeholder images in all 8 series-6 blog posts with actual screenshots from Tests/AngularNetTutorial-Playwright/screenshots-output/
• Images are matched to blog content using screenshot-catalog.json (articles[] field)
• Article 6.3 gains 4 additional body images (AI Assistant full page, empty state, HR Insight empty, HR Insight with answer)
• Article 6.1 gains the Swagger AI endpoints overview image alongside the existing chat endpoint image
• Includes previous commits: series-6 narrative fixes and submodule ref updates

Test plan

• Open each series-6 blog in a Markdown previewer and verify images render correctly
• Confirm relative paths resolve from blogs/series-6-ai-app-features/ to Tests/AngularNetTutorial-Playwright/screenshots-output/
• Verify no blogs still reference the old application-dashboard-anonymous.png placeholder