[corylanou]

Summary

Add a practical article showing how docs, a blog post, and a course lesson reuse the same explanation and runnable example through Hype includes. Cover a content tree that works with the current CLI, nested includes, audience-specific content, exports, headings, and links. Cross-link the single-source documentation and training materials articles.

The article includes its actual example sources and executes all three exports during the site build. Published by Gopher Guides with today's date; reviewed against Cory's voice samples and the requested no-ai-slop rules.

Closes #20

Type

• Content (new article or content update)
• Layout/Theme (template or styling changes)
• Infrastructure (Dockerfile, CI, config)
• Other

Test Plan

• make build succeeds (Hype built from current main, matching CI; 19 articles, no warnings)
• make dev shows changes correctly in browser (equivalent Hype watch preview inspected)
• No broken links or missing assets
• Copy all eight source snippets from rendered HTML into a fresh tree and run the export script
• Verify shared prose, source code, and executed output in all three exports
• Change shared prose and verify the edit reaches all three outputs
• Verify a missing include and broken Go example each stop the export script
• Run the course exercise and confirm output before and after cancellation
• Check shell syntax, Go formatting, and go vet; verify article metadata, homepage, RSS, and sitemap

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