Add PIA UI quality OpenCode skill

[MerverliPy]

Summary

• Add .opencode/skills/ui-quality/SKILL.md as a local UI-quality layer inspired by the taste-skill integration plan.
• Scope the skill to apps/web/, .ui-redesign/, mobile/PWA surfaces, shared CSS, page builders, UI states, visual hierarchy, and design-contract validation.
• Preserve PIA governance by making AGENTS.md, repository adapter, decision ledger, approved contracts, and existing route/API/data/dependency boundaries higher authority than the skill.
• Update .opencode/REGISTRY.md from 12 to 13 skills and register ui-quality so registry-count CI remains aligned.

Validation

• Verified the new skill file on branch ui-quality-skill.
• Verified .opencode/REGISTRY.md shows 25 agents, 28 commands, 13 skills and includes ui-quality in the skills table.

Notes

Direct commit to main was blocked by repository rules, so this change is provided through a PR as required.

[chatgpt-codex-connector]

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Reviewed commit: cbbbf01f18

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[chatgpt-codex-connector]

Avoid blocking pre-contract design phases

When this skill is used for /mobile-ui-design-contract or concept work (the skill applies to .ui-redesign/ and design-contract validation), this stop condition fires before an approved design contract exists, even though .opencode/commands/mobile-ui-design-contract.md is the workflow that creates and proposes that contract. That makes the pre-contract redesign phase report instead of editing the contract artifacts; limit this stop to implementation work that depends on an existing approved contract.

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[MerverliPy]

Implementation update after expanding the requested taste-skill additions:

• Added 7 additional local skills:
  • visual-concept-quality
  • output-completeness
  • image-to-implementation-bridge
  • readme-landing-quality
  • brand-system-quality
  • mobile-state-design
  • design-contract-lint
• Added 2 commands:
  • /ui-quality-audit
  • /ui-quality-fix
• Added 3 templates:
  • ui-quality-audit-template.md
  • visual-concept-critique-template.md
  • output-completeness-check-template.md
• Updated 5 agents to reference the new local quality layer:
  • mobile-ui-orchestrator
  • frontend-implementer
  • visual-concept-prototyper
  • accessibility-performance-validator
  • workflow-improvement-reviewer
• Updated .opencode/REGISTRY.md to 25 agents, 30 commands, 20 skills.
• Updated scripts/ci/check-registry-counts.sh so the registry remains the source of truth for file-count validation.

Review feedback noted that ui-quality could block pre-contract concept/design-contract work if the missing-contract stop condition applied too broadly; this still needs a small follow-up patch to narrow that stop condition to implementation work only.

Note: the PR body still reflects the initial smaller version of this PR because the later implementation expanded scope through follow-up commits and this comment records the current state.