[M5-S8] Final deploy and submission #74

Problem

Submitting late or with a broken URL loses everything.

Acceptance criteria

• Freeze at 11:00; production URL stable on desktop browsers
• Submitted in the organisers' format before 11:30 (see M0-S12)

Notes and dependencies

Suggested owner: Alexander (pipeline, art, scenes, deploy).

Verification

Open the submitted link in a private window on another laptop.