Add impeccable skill guidance

[sorenbs]

Summary

• installs the impeccable Codex skill into the repository agent skill set
• records the skill in skills-lock.json
• adds AGENTS.md guidance for UI polish, visual comparison, tokenized borders, and stable layout constraints

Why

This keeps the UI-quality workflow and installed skill separate from the Studio Query Insights feature PR, so the feature PR can stay focused on product behavior while this PR owns the repo agent guidance change.

Validation

• node -e "const fs=require('fs'); JSON.parse(fs.readFileSync('skills-lock.json','utf8')); console.log('skills-lock.json ok')"
• git diff --cached --check

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/impeccable-skill

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch codex/impeccable-skill

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[github-actions]

Compute preview deployed.

Branch: codex/impeccable-skill
Service: codex-impeccable-skill
Preview: https://cmpyzt5mt0qzkfdvduwdsj51b.cdg.prisma.build
Version: https://cv-c05b90afb6a1.cdg.prisma.build