update link

Add per-track test-data instructions + release Track 1 test parquet (labels stripped)

Section 03 Submission & Leaderboard: per-track tutorials, nav tabs, green eval-open milestone

Embed leaderboard (iframe) as section 03; renumber sections

Link to leaderboard space

Add Track 2 (auto-labeling leaderboard, no prize) + align timeline with AlpaSim (deadline 2026-10-31, winners early Dec)

Swap hero banner to 1600x400 email-header image (4:1 aspect + min-height floor)

Timeline: move Challenge announcement (CVPR 2026) 2026-06-11 -> 2026-06-04

Swap hero banner: placeholder mp4 -> CVPR26 AV reasoning challenge jpg (1920x1080)

Organizers: AV Group -> AV Research Group

Organizers: link to NVIDIA AVG team page (per Michael/Boris feedback)

Link PAI-AV Dataset in overview (non-test-data sentence)

Expand PAI -> Physical AI in display name

Rename to PAI-AV Reasoning Challenge per Boris feedback

Initial: pre-launch challenge info page (HfApi upload)

initial commit