Make design workflows evidence-first

[shinpr]

Summary

• Keep evaluation requests, speculative ideas, and suggested mechanisms outside confirmed scope until they are explicitly accepted.
• Select the smallest sufficient design from confirmed value, repository evidence, total complexity, and subtraction checks.
• Resolve decision-changing premises before approval, with a review-triggered bounded probe only when existing evidence cannot decide the design.
• Align agent handoffs, ADR and Design Doc templates, review gates, and multilingual documentation.
• Bump the plugin release version to 0.24.8.

Validation

• pnpm sync:check
• pnpm check:skills-index
• claude plugin validate .claude-plugin/marketplace.json
• claude plugin validate dev-workflows
• claude plugin validate dev-workflows-frontend
• claude plugin validate dev-workflows-fullstack
• claude plugin validate dev-skills
• git diff --check