v1.2.1 - Codex App native visual workflow

What changed

• Made Codex App native capabilities explicit in the wrapper skill: in-app browser context, local screenshot paths, Codex App vision, and imagegen only after assets are integrated.
• Extended first-run and specialist prompts to require desktop, tablet, mobile, and awkward fluid-breakpoint screenshots.
• Added vision-backed handoff packets and native guardrails to README, PROMPTS, QUICKSTART, installer output, and the demo proof packet.
• Tightened usage audit coverage so installer, docs, metadata, proof packet, and demo cannot drift back to desktop/mobile-only or non-vision claims.

Validation

• npm test
• H70-C+ validator: 16/16 valid, 0 errors, 0 warnings
• smoke test
• usage audit
• local npm run install:codex