Prepare live event launch defaults

[kingstarfly]

What to build

Prepare the live event configuration for HackaDeck launch so the QR-to-card flow has the correct Event, public routes, and demo-ready setup for AI Engineers Singapore 2026.

Before starting, read docs/HackaDeck_Product_Spec.md, CONTEXT.md, and AGENTS.md.

Acceptance criteria

• Confirm production Event details:
  • Name: "AI Engineers Singapore 2026"
  • Slug: ai-engineer-hack-2026
  • Edition label for cards: "AI Engineers Singapore 2026"
  • Start date/time for the event
• Create seed script or Convex mutation to initialize the Event and event counter for deployment.
• Confirm QR target URL format: should deep-link with event slug preselected (e.g., https://[domain]/?event=ai-engineer-hack-2026 or similar).
• Verify event page at /events/ai-engineer-hack-2026 is suitable for big-screen gallery display during the event.
• Document any environment variables needed:
  • OPENAI_API_KEY for GPT-5.5 and GPT Image 2
  • Any Convex deployment settings
• Test the full flow end-to-end on staging/preview deployment before going live.

Blocked by

None — can start immediately (configuration and seed script).

Note: The seed script should be run before testing any other issues.

For human

This is a HITL (human-in-the-loop) issue. After completion:

1. Run the seed script → Convex dashboard shows events row with correct name/slug, eventCounters row with nextCardNumber: 1
2. Deploy to preview/staging environment
3. Scan QR code on your phone → lands on quiz page with event preselected
4. Complete full flow → card appears in gallery
5. Open /events/ai-engineer-hack-2026 on a big screen → gallery looks good for live demo
6. Confirm: QR URL, env vars documented, ready for participant testing

For agents

Before marking this issue complete:

• Commit the implementation.
• Run pnpm gate and make sure it passes. This includes pnpm convex:check (convex dev --once), which pushes Convex schema and functions to the configured dev deployment and regenerates TypeScript bindings.
• Update this issue body so completed acceptance criteria are checked off (- [x]).
• Close the issue after the implementation is committed and verified.

This is a HITL issue, but if an agent assists with the seed script or configuration:

Before handing back to the human, leave a comment documenting:

• Exact seed script location and how to run it (e.g., npx convex run seed:createEvent)
• Any environment variables that must be set before deployment
• The QR URL format decided upon
• Any deployment steps or Convex dashboard actions needed
• What the human still needs to verify or decide