Add ui-visual-validator

[cryptonerdcn]

Add ui-visual-validator subagent that specializes in verifying UI modifications through rigorous screenshot analysis.

From my project:

https://github.com/cryptonerdcn/UI-Visual-Validator-Agent

[Bortus-AI]

this looks awesome! I needed something like this earlier today. I'll give it a spin and report back

[wshobson]

PR Review: Add ui-visual-validator

Overall Assessment: APPROVE

Solid addition that fills a genuine gap in our testing ecosystem with well-structured visual validation capabilities.

Strengths:

• Perfect structural consistency with existing agents (YAML frontmatter, sonnet model, naming conventions)
• Addresses real need - visual validation through screenshot analysis is missing from current collection
• Methodologically sound with 5-step analysis process and verification checklist
• Accurate README integration (75→76 agents, 44→45 Sonnet assignments)

Minor Suggestions:

Agent definition (line 12): Consider softening "Default assumption: The modification goal has NOT been achieved until proven otherwise" to avoid excessive false negatives. Something like "Verify achievement through clear visual evidence" maintains rigor with better balance.

README placement: New agent breaks alphabetical ordering in Development & Architecture section, though logical placement near ui-ux-designer makes sense.

Technical Review:

• All changes are appropriate and necessary
• No security concerns
• Documentation is comprehensive
• Model assignment is suitable for task complexity

Ready to merge - adds genuine value without technical debt or breaking changes.

[cryptonerdcn]

@wshobson Thanks for your review!