Submission window: open 2026-07-01, close 2026-09-07

[quinn-dougherty]

Description

Playbook §3.2 / §6 fixes the submission window. Open 2026-07-01, close 2026-09-07 (reviews due 2026-09-21, decisions 2026-09-24).

Requirements

• Enforce server-side via env vars SUBMISSIONS_OPEN_AT, SUBMISSIONS_CLOSE_AT.
• Block /submit POST outside the window; show countdown on the page.
• Late submissions: default reject. Quinn-only override via /admin.
• Confirmation email includes a signed edit-link token that expires at close.
• Communicate deadline (with canonical timezone) on /submit, landing CTA, and announcement emails.

Dependencies

• Conference date locked (Lock conference date (target 2026-10-17, Q3/Q4 window) #6).
• Submission form built (Build /submit form (papers / repos / breakout sessions) #1).
• Curators seated before submissions open (Build /curate form (curator application) #2).