WS0 of the video-producer plan: every group can open a public,
accountless upload box (random token, rotatable, disable switch).
Submitters tick the Creative Commons qualifier; credit name and a
licensing contact are optional free text — contact is visible only in
the moderation surface and never copied onto assets. Intake sniffs
magic bytes (mp4/webm/jpeg/png), caps video 200 MiB / photo 50 MiB,
rate-limits 5/hour per salted IP hash (hash never rendered), dedups by
sha256, caps 5 pending per box, and quarantines everything as pending.
Group managers approve (video → video library via the register+probe
path, photo → group asset) or reject with a note; every step audited.
Migration 035 (RLS + submission_box_lookup/submission_rate_count
definer fns). 4 unit + 4 live-DB tests.