add setup wizard plan and update progress roadmap

Detailed plan for setup wizard, go-live gate, and registration
lockdown. Covers single-admin account creation, coming soon page,
admin setup checklist, and platform compatibility notes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

PROGRESS.md

@@ -20,7 +20,15 @@
 - Transactional emails (order confirmation, shipping notification)
 - Demo content polished and ready for production
 
-**Tier 1 MVP complete.** CI pipeline done. Hosting & deployment done (including observability). PageSpeed CI done (99-100 mobile, 97+ desktop). Next up: usability fixes from user testing, then remaining Tier 2 items (Litestream backup, e2e tests).
+**Tier 1 MVP complete.** CI pipeline done. Hosting & deployment done (including observability). PageSpeed CI done (99-100 mobile, 97+ desktop). Usability fixes mostly done (15/18). Next up: setup wizard, then real product data, then shipping costs.
+
+## Next Up: Setup Wizard → Real Products → Shipping
+
+Three linked tasks to make the shop fully functional for real orders:
+
+1. **Setup wizard & go-live gate** — coming soon page for public visitors, admin setup checklist, go-live toggle. See [docs/plans/setup-wizard.md](docs/plans/setup-wizard.md)
+2. **Wire real product data** — replace PreviewData with Products context on shop pages (depends on setup wizard being done so there's a gate while testing)
+3. **Shipping costs at checkout** — Printify shipping rates or Stripe shipping options (depends on real products being connected)
 
 ## Usability Issues (from user testing, Feb 2025)