Add article on AI answers as workspaces

[tuanadr]

Summary

• adds an issue Written Content: 5 Things That Look Terrible as Plain Text (And How OpenUI Fixes Them) #5 article using a distinct "AI answers that should become workspaces" angle
• covers five concrete cases where plain text loses useful working structure: product comparisons, incident triage, forms, setup guidance, and approval reviews
• positions OpenUI as the constrained component-library boundary for turning those answers into safe rendered surfaces

Validation

• git diff --check
• npx --yes markdownlint-cli "Articles/Five AI Answers That Should Be Workspaces.md" --disable MD013

Disclosure

Drafting and editing were AI-assisted. I checked the article against the OpenUI component-library and renderer model, and I am responsible for the final wording and technical accuracy.

Related: #5