docs: update launch readiness with comprehensive 360 analysis
- Update overall status from 95% to 85% reflecting complete platform scope
- Add detailed Vendor Dashboard section (82% - 14/17 features)
- Add Shop/Storefront section (75% - 12/16 features)
- Update Admin/Platform section (95% complete)
- Identify critical launch blockers: payment verification, password reset, search
- Add deferrable features table (wishlist, customers API, notifications)
- Add slice schedule for post-launch features (3, 4, 5)
- Add recent completions section (January 2026)
- Update launch checklist with new items
- Add prioritized recommendations
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>